{"title":"WatchGas","description":"","products":[{"product_id":"watchgas-sst1-2-year-h2s-gas-detector-sst1-h-24","title":"WatchGas SST1 2 Year H2S Gas Detector SST1-H-24","description":"\u003cp\u003e\u003cstrong\u003eNot every H2S monitor needs to give you a number. Sometimes the job just needs a badge that alarms when you're in danger — no calibration schedule, no battery replacement cycle, no training curve. That's what the SST1 Limited-Life line is for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 2-Year H2S gas detector is an alert-only monitor: no digital ppm display, factory-set alarm setpoints anchored to major U.S. regulatory ceiling limits, non-serviceable, and no maintenance required. Activate it once, and it runs continuously for two years — no calibration, no battery replacement, no charging — alarming immediately when it detects hydrogen sulfide above the factory-set thresholds. At $150, it's the shortest-commitment, lowest-cost H2S monitor in the SST1 line — designed for jobs that finish inside two years.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThree ways to run H2S monitoring — pick the one that fits your job.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe SST1 line covers all three tiers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-instrument, serviceable:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H serviceable H2S monitor\u003c\/a\u003e ($290) — digital ppm readout, configurable low\/high\/TWA\/STEL alarms, replaceable sensor cell at end-of-life. Higher upfront cost; lowest lifecycle cost for fleets in continuous multi-year service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlert-only, 3-year lifespan:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-h2s-gas-detector-sst1-h-36\"\u003eWatchGas SST1-H-36 3-Year Alert-Only\u003c\/a\u003e ($210) — no display, factory-set alarms, non-serviceable, three-year operational life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlert-only, 2-year lifespan (this SKU):\u003c\/strong\u003e $150, same alert-only design, two-year operational life. Lowest upfront cost; ideal for shorter-duration commitments like single-project contractor work, grab-and-go emergency inventory, or training programs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFactory-set alarm thresholds, anchored to U.S. regulatory exposure limits for hydrogen sulfide\u003c\/strong\u003e (H2S is regulated as a ceiling limit, not an 8-hour time-weighted average): Low 10 ppm matches the NIOSH REL Ceiling exactly (10 ppm, 10-minute maximum). High 15 ppm sits between NIOSH's 10 ppm ceiling and OSHA's 20 ppm ceiling under 29 CFR 1910.1000 Table Z-2 — a graduated alarm structure that triggers well before OSHA's regulatory limit. Because the alarms are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of accidentally reconfiguring a monitor away from a compliant threshold in the field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST1-H-24 for H2S monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContractors and subcontractors on short-duration oil \u0026amp; gas turnaround work — 2-year lifespan matches multi-month contract cycles better than 3-year for single-project work\u003c\/li\u003e\n\u003cli\u003eSmall crews at wastewater treatment plants and sewer operations without full safety-program overhead\u003c\/li\u003e\n\u003cli\u003eMunicipal utility emergency response teams needing low-cost grab-and-go H2S inventory\u003c\/li\u003e\n\u003cli\u003eMining and mineral processing crews entering H2S-prone confined space areas on temporary assignment\u003c\/li\u003e\n\u003cli\u003ePulp and paper mill maintenance teams on short-project deployments\u003c\/li\u003e\n\u003cli\u003eTraining programs using disposable monitors for teaching — shorter lifespan means training-gear inventory turns more frequently at lower unit cost\u003c\/li\u003e\n\u003cli\u003eConsultants and auditors on temporary deployments at client sites where H2S is a known hazard\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH2S (2-year fixed life)\u003c\/td\u003e\n\u003ctd\u003e0 – 500 ppm\u003c\/td\u003e\n\u003ctd\u003e10 ppm \u003cem\u003e(NIOSH REL Ceiling)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e15 ppm \u003cem\u003e(between NIOSH 10 \/ OSHA 20)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e The SST1 Limited-Life alert-only monitors don't require calibration during their fixed lifespan (the whole point of the design), but if you're mixing them with a fleet of the serviceable SST1 line — or with any other gas detectors — PK Safety supports the full WatchGas SST platform, plus BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S monitoring workflow with someone who understands all three tiers of the SST1 H2S line and can help you pick the right one for the job.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant lifecycle notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e One year shelf life (unactivated) then two years from activation date. Your operational clock starts the moment you turn the monitor on for the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce activated, the monitor cannot be shut down.\u003c\/strong\u003e It continues to run for its full two-year life span, and cannot be returned or shipped once activated (an alarm during transit is possible). Unactivated monitors can be returned normally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot resellable after activation.\u003c\/strong\u003e Buy for a specific worker or crew; the monitor stays with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe display shows MM and DD\u003c\/strong\u003e — months and days remaining before the monitor expires — not the current gas concentration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-DS-V1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-QSG-V1.7.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-2-3-YEAR-MAN-ENG-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-H-24 — SST1-H-24 0–500 ppm 2-year fixed life (hydrogen sulfide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST1-H-24 alert-only monitor differ from the full-instrument SST1-H and the 3-year SST1-H-36?\u003c\/summary\u003e\n\u003cp\u003eThe SST1 platform offers three tiers for H2S monitoring, and this is the entry-price alert-only tier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisplay and configuration:\u003c\/strong\u003e the SST1-H-24 has no digital ppm display and no user-configurable alarm setpoints — it shows months and days remaining on its lifespan and alarms when H2S exceeds its factory-set threshold. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H serviceable H2S monitor\u003c\/a\u003e shows continuous ppm readouts and offers configurable low\/high\/TWA\/STEL alarms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor lifecycle and price:\u003c\/strong\u003e the SST1-H-24 is non-serviceable, discarded at end-of-life after two years of continuous operation, and priced at $150 — the lowest entry point in the SST1 H2S line. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-h2s-gas-detector-sst1-h-36\"\u003eSST1-H-36 3-Year Alert-Only\u003c\/a\u003e is the same design but with a three-year lifespan and higher price ($210). The full-instrument SST1-H is serviceable — the sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eChoose the SST1-H-24 for the shortest-commitment jobs (single-project contractor work, grab-and-go emergency inventory, training programs, temporary consultants). Choose the SST1-H-36 for jobs that will run through the full three-year sensor life. Choose the SST1-H for fleets that stay in continuous service across multiple sensor generations.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-H-24 ships with factory-set alarms of Low 10 ppm and High 15 ppm. Both are anchored to U.S. regulatory exposure thresholds for hydrogen sulfide, which is regulated as a ceiling limit (not an 8-hour time-weighted average):\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOSHA's ceiling\u003c\/strong\u003e under 29 CFR 1910.1000 Table Z-2 is 20 ppm — workers should never be exposed above 20 ppm at any instant. OSHA also permits a 50 ppm 10-minute peak once per shift, but only if no other measurable exposure occurs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNIOSH's REL\u003c\/strong\u003e is stricter at 10 ppm as a 10-minute ceiling (per the CDC\/NIOSH Pocket Guide).\u003c\/p\u003e\n\u003cp\u003eThe SST1-H-24's \u003cstrong\u003eLow 10 ppm\u003c\/strong\u003e alarm matches the NIOSH REL Ceiling exactly. The \u003cstrong\u003eHigh 15 ppm\u003c\/strong\u003e alarm sits between NIOSH's 10 ppm ceiling and OSHA's 20 ppm ceiling — a graduated alarm structure that triggers well before OSHA's regulatory limit. Because the setpoints are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field.\u003c\/p\u003e\n\u003cp\u003eIf your facility's internal exposure program requires stricter setpoints — for example, ACGIH's much stricter TLV-TWA of 1 ppm (2010 revision) — the full-instrument \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H serviceable H2S monitor\u003c\/a\u003e is the right choice; its low\/high\/TWA\/STEL alarms are all configurable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"2-year\" actually mean? When does the clock start?\u003c\/summary\u003e\n\u003cp\u003eThe lifecycle has two phases. Before activation, the monitor has a one-year shelf life (from manufacture date) during which it can sit unactivated in a warehouse or on a shelf without draining any capability. Once you press the activation button for the first time, the monitor runs continuously for two years — no user intervention required, no calibration, no battery replacement, no charging.\u003c\/p\u003e\n\u003cp\u003eThe display shows MM (months) and DD (days) remaining on the monitor's operational life so workers can see how much time is left. At the end of the two-year lifespan, the monitor stops functioning and gets discarded.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eOnce activated, can the monitor be shut down, returned, or shipped?\u003c\/summary\u003e\n\u003cp\u003eNo. Once activated, the SST1-H-24 cannot be turned off — it continues to run for its full two-year lifespan. This design intentionally prevents accidental shutdown of a live safety instrument, but it has three practical implications:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot shippable after activation:\u003c\/strong\u003e because the alarm may sound during transit, activated monitors cannot be shipped by common carriers. Ship unactivated units, activate on-site.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot returnable after activation:\u003c\/strong\u003e activated units are not eligible for return. Unactivated units can be returned normally within PK Safety's standard return window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot resellable after activation:\u003c\/strong\u003e assign each activated monitor to a specific worker or crew; it stays with them for its lifespan.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-H-24 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003ePartially. The SST1-H-24 can be bump-tested using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e — useful for verifying the monitor still alarms correctly at a given point in its two-year lifespan. However, it cannot be calibrated (the factory-set thresholds are permanent by design).\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e compliance kiosk can check in the SST1-H-24 and log its alarm-event history and remaining lifespan to fleet software — same as the full-instrument SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-H-24 after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line, including all three tiers of H2S monitoring (serviceable SST1-H, 3-year SST1-H-36, 2-year SST1-H-24). Since the SST1-H-24 doesn't require calibration or maintenance during its fixed two-year lifespan, post-sale support is primarily replacement (when a unit approaches end-of-life) and mixed-fleet coordination if you're running Limited-Life alongside full-instrument SST1 monitors or other brands.\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S monitoring workflow with someone who understands all three tiers of the SST1 line — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST1 H2S tier fits your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the serviceable \/ 3-year alert-only \/ 2-year alert-only choice will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52187789885807,"sku":"WG01-SST1-H-24","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-H2S-24_800x800compressed.jpg?v=1756318002"},{"product_id":"watchgas-sst1-2-year-co-gas-detector-sst1-m-24","title":"WatchGas SST1 2 Year CO Gas Detector SST1-M-24","description":"\u003cp\u003e\u003cstrong\u003eNot every CO monitor needs to give you a number. Sometimes the job just needs a badge that alarms when you're in danger — no calibration schedule, no battery replacement cycle, no training curve. That's what the SST1 Limited-Life line is for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCarbon monoxide is odorless, colorless, and tasteless.\u003c\/strong\u003e Workers get zero sensory warning that CO is accumulating in an enclosed space — not until the physiological effects kick in (headache, dizziness, confusion), and by then the exposure is already past regulatory limits and can escalate quickly. For CO, the monitor isn't a backup to your senses. It IS the warning system.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 2-Year CO gas detector is an alert-only monitor: no digital ppm display, factory-set alarm setpoints anchored to the NIOSH REL for carbon monoxide, non-serviceable, and no maintenance required. Activate it once, and it runs continuously for two years — no calibration, no battery replacement, no charging — alarming immediately when CO exceeds the factory-set thresholds. At $150, it's the shortest-commitment, lowest-cost CO monitor in the SST1 line — designed for jobs that finish inside two years.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThree ways to run CO monitoring — pick the one that fits your job.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe SST1 line covers all three tiers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-instrument, serviceable:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M serviceable CO monitor\u003c\/a\u003e — digital ppm readout, configurable low\/high\/TWA\/STEL alarms, replaceable sensor cell at end-of-life. Higher upfront cost; lowest lifecycle cost for fleets in continuous multi-year service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlert-only, 3-year lifespan:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-co-gas-detector-sst1-m-36\"\u003eWatchGas SST1-M-36 3-Year Alert-Only\u003c\/a\u003e ($210) — no display, factory-set alarms, non-serviceable, three-year operational life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlert-only, 2-year lifespan (this SKU):\u003c\/strong\u003e $150, same alert-only design, two-year operational life. Lowest upfront cost; ideal for shorter-duration commitments like single-project contractor work, seasonal operations, grab-and-go emergency inventory, or training programs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFactory-set alarm thresholds, anchored to U.S. regulatory exposure limits for carbon monoxide:\u003c\/strong\u003e Low 35 ppm matches the NIOSH REL TWA (35 ppm 8-hour). High 200 ppm matches the NIOSH REL Ceiling (200 ppm not to be exceeded at any moment). Both are stricter than OSHA's PEL of 50 ppm 8-hour TWA under 29 CFR 1910.1000 Table Z-1, which does not establish a separate ceiling for CO in general industry. Because the alarms are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of accidentally reconfiguring a monitor away from a compliant threshold in the field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST1-M-24 for CO monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContractors and subcontractors on short-duration CO-exposed work — boiler service, HVAC installation, industrial turnarounds\u003c\/li\u003e\n\u003cli\u003eSmall boiler-operator crews at facilities without full safety-program overhead\u003c\/li\u003e\n\u003cli\u003eMunicipal fire departments and mutual-aid teams needing low-cost grab-and-go CO inventory for post-fire investigation and structural fire response\u003c\/li\u003e\n\u003cli\u003eHVAC and plumbing technicians on temporary or per-project deployments\u003c\/li\u003e\n\u003cli\u003eGrain drying and crop processing operators on seasonal cycles — the 2-year lifespan matches multi-season contract periods\u003c\/li\u003e\n\u003cli\u003eVehicle emissions monitoring at garages, warehouses with propane forklifts, tunnels, or parking structures where the monitoring need is temporary\u003c\/li\u003e\n\u003cli\u003eTraining programs using disposable monitors for teaching — shorter lifespan means faster inventory turn at lowest unit cost\u003c\/li\u003e\n\u003cli\u003eConsultants and auditors on temporary deployments at client sites\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCO (2-year fixed life)\u003c\/td\u003e\n\u003ctd\u003e0 – 2000 ppm\u003c\/td\u003e\n\u003ctd\u003e35 ppm \u003cem\u003e(NIOSH REL TWA)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e200 ppm \u003cem\u003e(NIOSH REL Ceiling)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e The SST1 Limited-Life alert-only monitors don't require calibration during their fixed lifespan (the whole point of the design), but if you're mixing them with a fleet of the serviceable SST1 line — or with any other gas detectors — PK Safety supports the full WatchGas SST platform, plus BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO monitoring workflow with someone who understands all three tiers of the SST1 CO line and can help you pick the right one for the job.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant lifecycle notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e One year shelf life (unactivated) then two years from activation date. Your operational clock starts the moment you turn the monitor on for the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce activated, the monitor cannot be shut down.\u003c\/strong\u003e It continues to run for its full two-year life span, and cannot be returned or shipped once activated (an alarm during transit is possible). Unactivated monitors can be returned normally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot resellable after activation.\u003c\/strong\u003e Buy for a specific worker or crew; the monitor stays with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe display shows MM and DD\u003c\/strong\u003e — months and days remaining before the monitor expires — not the current gas concentration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-DS-V1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-QSG-V1.7.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-2-3-YEAR-MAN-ENG-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-M-24 — SST1-M-24 CO 0–2000 ppm 2-year fixed life (carbon monoxide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST1-M-24 alert-only monitor differ from the full-instrument SST1-M and the 3-year SST1-M-36?\u003c\/summary\u003e\n\u003cp\u003eThe SST1 platform offers three tiers for CO monitoring, and this is the entry-price alert-only tier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisplay and configuration:\u003c\/strong\u003e the SST1-M-24 has no digital ppm display and no user-configurable alarm setpoints — it shows months and days remaining on its lifespan and alarms when CO exceeds its factory-set threshold. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M serviceable CO monitor\u003c\/a\u003e shows continuous ppm readouts and offers configurable low\/high\/TWA\/STEL alarms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor lifecycle and price:\u003c\/strong\u003e the SST1-M-24 is non-serviceable, discarded at end-of-life after two years of continuous operation, and priced at $150 — the lowest entry point in the SST1 CO line. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-co-gas-detector-sst1-m-36\"\u003eSST1-M-36 3-Year Alert-Only\u003c\/a\u003e is the same design but with a three-year lifespan and higher price ($210). The full-instrument SST1-M is serviceable — the sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eChoose the SST1-M-24 for the shortest-commitment jobs (single-project contractor work, seasonal operations, grab-and-go emergency inventory, training). Choose the SST1-M-36 for jobs that will run through the full three-year sensor life. Choose the SST1-M for fleets that stay in continuous service across multiple sensor generations.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-M-24 ships with factory-set alarms of Low 35 ppm and High 200 ppm. Both are anchored to the NIOSH Recommended Exposure Limit for carbon monoxide, which is stricter than the OSHA PEL for CO:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOSHA's PEL\u003c\/strong\u003e for carbon monoxide under 29 CFR 1910.1000 Table Z-1 is 50 ppm as an 8-hour time-weighted average. OSHA does not set a separate ceiling limit for CO in general industry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNIOSH's REL\u003c\/strong\u003e is stricter: 35 ppm 8-hour TWA plus a 200 ppm ceiling not to be exceeded at any moment.\u003c\/p\u003e\n\u003cp\u003eThe SST1-M-24's \u003cstrong\u003eLow 35 ppm\u003c\/strong\u003e alarm matches the NIOSH REL TWA exactly, and the \u003cstrong\u003eHigh 200 ppm\u003c\/strong\u003e alarm matches the NIOSH REL Ceiling exactly. Because the setpoints are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field.\u003c\/p\u003e\n\u003cp\u003eIf your facility's internal exposure program requires stricter setpoints than NIOSH — for example, ACGIH's TLV-TWA of 25 ppm for CO — the full-instrument \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M serviceable CO monitor\u003c\/a\u003e is the right choice; its low\/high\/TWA\/STEL alarms are all configurable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is CO monitoring different from monitoring other gases?\u003c\/summary\u003e\n\u003cp\u003eCarbon monoxide is odorless, colorless, and tasteless. Unlike H2S (rotten-egg smell at low ppm), ammonia (pungent), or sulfur dioxide (sharp acid smell), CO gives workers zero sensory warning that concentrations are building up in an enclosed space. Symptoms of CO exposure — headache, dizziness, confusion, nausea — typically don't kick in until concentrations are already past regulatory limits, and CO poisoning can escalate quickly from mild symptoms to loss of consciousness.\u003c\/p\u003e\n\u003cp\u003eThat physiology has one operational implication for CO monitoring: the monitor isn't a backup or a confirmation of what workers can already sense. It IS the warning system. Whether you use a full-instrument SST1-M for continuous ppm readouts or an alert-only SST1-M-24 for factory-set threshold alarming, the monitor is the difference between recognizing a CO buildup in time and getting caught by it.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"2-year\" actually mean? When does the clock start?\u003c\/summary\u003e\n\u003cp\u003eThe lifecycle has two phases. Before activation, the monitor has a one-year shelf life (from manufacture date) during which it can sit unactivated in a warehouse or on a shelf without draining any capability. Once you press the activation button for the first time, the monitor runs continuously for two years — no user intervention required, no calibration, no battery replacement, no charging.\u003c\/p\u003e\n\u003cp\u003eThe display shows MM (months) and DD (days) remaining on the monitor's operational life so workers can see how much time is left. At the end of the two-year lifespan, the monitor stops functioning and gets discarded.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-M-24 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003ePartially. The SST1-M-24 can be bump-tested using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e — useful for verifying the monitor still alarms correctly at a given point in its two-year lifespan. However, it cannot be calibrated (the factory-set thresholds are permanent by design).\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e compliance kiosk can check in the SST1-M-24 and log its alarm-event history and remaining lifespan to fleet software — same as the full-instrument SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-M-24 after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line, including all three tiers of CO monitoring (serviceable SST1-M, 3-year SST1-M-36, 2-year SST1-M-24). Since the SST1-M-24 doesn't require calibration or maintenance during its fixed two-year lifespan, post-sale support is primarily replacement (when a unit approaches end-of-life) and mixed-fleet coordination if you're running Limited-Life alongside full-instrument SST1 monitors or other brands.\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO monitoring workflow with someone who understands all three tiers of the SST1 line — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST1 CO tier fits your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the serviceable \/ 3-year alert-only \/ 2-year alert-only choice will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52187787100527,"sku":"WG01-SST1-M-24","price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-CO-24-800x800compressed_e07c1391-106b-48e0-8080-a957f08d0c68.jpg?v=1756394620"},{"product_id":"watchgas-sst4-micro-diffusion-4-gas-detector","title":"WatchGas SST4-MICRO Diffusion 4-Gas Detector","description":"\u003cp\u003e\u003cstrong\u003eEvery confined-space entry starts with the same four questions: enough O2, no combustibles at the LEL, no CO, no H2S. All four have to be right, every entry, every shift.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eEntry teams in oil \u0026amp; gas, refining, wastewater, mining, and industrial contracting run this checklist dozens of times a week. Juggling two or three single-gas monitors on a belt — different alarm sounds, different bump schedules, different batteries dying at different times — is how the small errors accumulate.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST4-MICRO reads all four confined-space gases continuously — one instrument, one battery, one alarm pattern to trust, for a full 48-hour shift.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eOne instrument. Configurable low, high, TWA, and STEL alarms tuned to OSHA confined-space thresholds under 29 CFR 1910.146 (19.5% and 23.5% O2, 10% LEL, and toxic-gas setpoints for CO or SO2 plus H2S). Audible (95 dB at 30 cm), visual, and vibration alarms — you feel the SST4-MICRO in a noisy compressor room. The fastest T90 in its class means the alarm fires before the atmosphere shifts around you, not after. Largest LCD in the category — readable at arm's length in dim confined spaces. Near Field Communication for phone-based configuration. Wireless charging drops it onto an induction pad — no cable failures at the connector.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy safety managers and entry-team leads standardize on the SST4-MICRO:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-instrument answer to the standard four confined-space atmospheric hazards under 29 CFR 1910.146\u003c\/li\u003e\n\u003cli\u003eChoice of CO or SO2 on the fourth channel — CO for petrochemical, refining, generator, and indoor-combustion work; SO2 for pulp, paper, smelter, and ore-roasting operations\u003c\/li\u003e\n\u003cli\u003eLow Power Catalytic (LPC) LEL sensor — longer service life than legacy pellistor designs, at lower power draw\u003c\/li\u003e\n\u003cli\u003e48-hour battery life on a single charge — full shift plus overnight rest\u003c\/li\u003e\n\u003cli\u003e2-year warranty on the SST4 platform\u003c\/li\u003e\n\u003cli\u003eBump test and calibration compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e for fleet management — wireless-charging pad and bump\/cal workflow in one docking session\u003c\/li\u003e\n\u003cli\u003eNFC configuration from a mobile device — no button sequence memorization\u003c\/li\u003e\n\u003cli\u003eDatalogging for compliance audits — OSHA 29 CFR 1910.146 permit-required confined space, and internal safety programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If a sensor drifts or reaches end-of-life, send the unit to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through the SST4-MICRO setup with someone who actually understands confined-space entry and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou perform permit-required confined-space entries under 29 CFR 1910.146 (tanks, vaults, sewers, boilers, silos, shafts, treatment cells)\u003c\/li\u003e\n\u003cli\u003eYou need a single instrument that covers the four standard confined-space atmospheric hazards\u003c\/li\u003e\n\u003cli\u003eYour industry needs CO on the fourth channel (petrochemical, refining, generator ops, indoor combustion) OR SO2 (pulp, paper, smelter, ore roasting)\u003c\/li\u003e\n\u003cli\u003eYou want NFC configuration, wireless charging, and SST-DOCK compatibility for fleet lifecycle management\u003c\/li\u003e\n\u003cli\u003eYou're standardizing your entry-team fleet on one instrument type across a mixed-brand shop\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST4-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST4-DS-v1.3.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/07\/MKT-SST4-QSG-v1.4.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/11\/SST4-SST4Pump-SST5-MAN-ENG-v1.0.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Manual\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eWG01-SST4-MICRO-X1OMH-Y — LPC \/ O2 \/ CO \/ H2S (filtered), Low Power Cat Bead\u003cbr\u003eWG01-SST4-MICRO-X1OSH-Y — LPC \/ O2 \/ SO2 \/ H2S (filtered LEL Sensor), Low Power Cat Bead\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the standard alarm setpoints for a confined-space 4-gas monitor?\u003c\/summary\u003e\n\u003cp\u003eUnder OSHA's permit-required confined-space entry standard (29 CFR 1910.146), the atmosphere is classified oxygen-deficient below 19.5% O2 and oxygen-enriched above 23.5% O2. For combustible gases, entry is prohibited when concentrations exceed 10% of the lower explosive limit (LEL). Toxic-gas alarm thresholds are set below OSHA's permissible exposure limits — for H2S, the OSHA ceiling is 20 ppm (29 CFR 1910.1000 Table Z-2); for CO, the 8-hour PEL is 50 ppm.\u003c\/p\u003e\n\u003cp\u003eThe SST4-MICRO ships with configurable low, high, TWA, and STEL setpoints for each gas, so you can tune to OSHA compliance levels, ACGIH TLVs, or a stricter internal standard. Factory-set alarm points are documented in the specification sheet.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhen do I need a 4-gas monitor versus a single-gas monitor?\u003c\/summary\u003e\n\u003cp\u003ePermit-required confined-space entries under 29 CFR 1910.146 require testing for oxygen concentration, combustible gases, and toxic gases before and during entry. A 4-gas monitor covers all three atmospheric categories in a single instrument — O2, LEL (combustibles), and two toxic gases (H2S plus either CO or SO2 depending on the model). If your work involves confined-space entry, you need at least the four-gas set on hand.\u003c\/p\u003e\n\u003cp\u003eSingle-gas monitors are for continuous personal exposure monitoring for one specific hazard (like a shift-long H2S monitor on a sour-oil site) — they complement but do not replace a 4-gas for entry testing. Many operators pair a 4-gas SST4-MICRO for entry with a single-gas SST1 series monitor for continuous shift-length exposure tracking.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat's the difference between LPC, catalytic bead, and NDIR LEL sensors?\u003c\/summary\u003e\n\u003cp\u003eAll three detect combustible gases, with different tradeoffs. Traditional catalytic bead (pellistor) sensors have been the confined-space standard for decades but are susceptible to sensor poisoning (silicone, sulfur, tetraethyl lead) and drift over time. Low Power Catalytic (LPC) — used in the SST4-MICRO — is a modern refinement of the catalytic principle with longer service life, better poisoning resistance, and lower power draw. NDIR (Non-Dispersive Infrared) sensors don't require oxygen to detect combustibles and don't suffer from catalytic poisoning, but they respond to methane and heavier hydrocarbons at different sensitivities and cost more.\u003c\/p\u003e\n\u003cp\u003eLPC is the mainstream choice for oil \u0026amp; gas and general confined-space work. If your entries are in inerted atmospheres (nitrogen, CO2 blankets) where oxygen is intentionally displaced, NDIR is worth considering — the SST4-PUMP and SST4-MINI offer NDIR-LEL sensor options for that use case.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often should I bump test and calibrate the SST4-MICRO?\u003c\/summary\u003e\n\u003cp\u003eBump test before every use — a quick check with a known gas concentration that confirms the sensor responds and the alarms fire. Calibration is a longer procedure that adjusts sensor readings against a certified gas concentration standard. Manufacturer recommendation for the SST4 platform is calibration every six months at minimum; many operators calibrate quarterly or after any alarm event.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e automates both bump test and calibration in about 60 seconds per unit and logs everything for compliance audits under 29 CFR 1910.146 recordkeeping requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST4-MICRO work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST4-MICRO is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. If you're running a fleet of SST4-MICRO monitors, the SST-DOCK automates the compliance workflow with timestamped logs suitable for OSHA audits.\u003c\/p\u003e\n\u003cp\u003eThe wireless-charging pad on the SST-DOCK connects to the SST4-MICRO with no cable connectors — one docking session covers bump test, calibration, log upload, and battery charge in a single hands-off workflow.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST4-MICRO after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST4-MICRO with factory-trained technicians in-house. That covers sensor replacement, calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your confined-space entry program with someone who knows the SST4 platform and understands the entry work — not a call-center script.\u003c\/p\u003e\n\u003cp\u003ePK Safety also handles BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof, so a mixed-brand fleet doesn't mean shipping to multiple service centers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure the SST4-MICRO is the right fit for your entry program? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows confined-space entry and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Carbon Monoxide (CO)","offer_id":52187787133295,"sku":"WG01-SST4-MICRO-X1OMH-Y","price":680.0,"currency_code":"USD","in_stock":true},{"title":"Sulfur Dioxide (SO2)","offer_id":52187787166063,"sku":"WG01-SST4-MICRO-X1OSH-Y","price":735.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/micro-1-1800x800compressed.jpg?v=1756318182"},{"product_id":"watchgas-sst4-mini-diffusion-4-gas-detector","title":"WatchGas SST4-MINI Diffusion 4-Gas Detector","description":"\u003cp\u003e\u003cstrong\u003eThe best 4-gas monitor is the one that actually gets worn.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA monitor that ends up on a truck seat because it was too bulky to clip on the harness or belt for a full shift is worth zero when the atmosphere shifts. Tradespeople who work hands-full — electrical contractors on utility poles, HVAC service techs in mechanical rooms and attics, plumbers in crawlspaces and pump vaults, communication line workers in manholes — need a 4-gas monitor small enough to disappear onto their body and stay there.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST4-MINI is the smaller-footprint sibling of the SST4-MICRO — same 4-gas coverage (O2, LEL, H2S, CO), same 48-hour battery, same alarms tuned to OSHA confined-space thresholds under 29 CFR 1910.146 — in a form factor sized to belt or harness carry all shift.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eConfigurable low, high, TWA, and STEL alarms for each gas. Audible (95 dB at 30 cm), visual, and vibration alarms — you feel the SST4-MINI in a running-machine environment or on a windy line-work site. The fastest T90 in its class fires the alarm before the atmosphere shifts around you. Largest LCD in the compact 4-gas category — readable at a glance without pulling the monitor off your belt. Near Field Communication for phone-based configuration. Wireless charging drops it onto an induction pad at end of shift — no cable connectors to fail.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy hands-full tradespeople and utility contractors standardize on the SST4-MINI:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFull 4-gas coverage (O2, LEL, H2S, CO) in a small-footprint case that clips to a belt or harness without hanging up on gear\u003c\/li\u003e\n\u003cli\u003eChoice of LEL CAT (catalytic bead) or LEL NDIR (non-dispersive infrared) sensor — CAT for standard oxygenated work; NDIR for entries into inerted atmospheres (nitrogen blankets, CO2 storage, semiconductor process spaces)\u003c\/li\u003e\n\u003cli\u003e48-hour battery life — full shift plus overnight rest, no mid-day recharge scramble\u003c\/li\u003e\n\u003cli\u003eSame 2-year warranty as the SST4 platform\u003c\/li\u003e\n\u003cli\u003eNFC configuration from a mobile device\u003c\/li\u003e\n\u003cli\u003eCompatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e for automated bump test and calibration — same docking workflow as SST4-MICRO and SST4-PUMP, so a mixed fleet runs through one dock\u003c\/li\u003e\n\u003cli\u003eDatalogging for compliance audits under 29 CFR 1910.146\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If a sensor drifts or reaches end-of-life, send the unit to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your gas-detection program with someone who understands trades-level 4-gas monitoring and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou are an electrical or utility contractor doing pole work, cable pulls, manhole entries, or transformer service\u003c\/li\u003e\n\u003cli\u003eYou are an HVAC service tech working in mechanical rooms, boiler rooms, attics, crawlspaces, or rooftop units\u003c\/li\u003e\n\u003cli\u003eYou are a plumber doing water, sewer, or gas service work near confined spaces or below-grade areas\u003c\/li\u003e\n\u003cli\u003eYou are a communication line worker or fiber-optic contractor doing manhole and vault work\u003c\/li\u003e\n\u003cli\u003eYou do hands-full trade work where a bulky monitor becomes a compliance liability (\"I left it in the truck\")\u003c\/li\u003e\n\u003cli\u003eYou need a 4-gas monitor sized to be worn continuously without getting hung up on tools, harness attachments, or work gear\u003c\/li\u003e\n\u003cli\u003eYou do occasional entries into inerted atmospheres and need the NDIR variant for combustible-gas detection where oxygen is displaced\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST4-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST4-DS-v1.3.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/07\/MKT-SST4-QSG-v1.4.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/11\/SST4-SST4Pump-SST5-MAN-ENG-v1.0.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Manual\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eWG01-SST4-MINI-X2OMH-Y — LEL CAT \/ O2 \/ CO \/ H2S (unfiltered LEL sensor), Catalytic Bead\u003cbr\u003eWG01-SST4-MINI-X3OMH-Y — LEL NDIR \/ O2 \/ CO \/ H2S, Non-Dispersive Infrared (for inerted atmospheres)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I choose the SST4-MINI or the larger SST4-MICRO?\u003c\/summary\u003e\n\u003cp\u003eBoth cover the same four confined-space gases (O2, LEL, H2S, CO) with the same alarm setpoints, same 48-hour battery, and same WatchGas SST platform features. The MINI's smaller form factor is the deciding factor when you or your crew work hands-full and can't clip a larger case to a belt or harness for a full shift.\u003c\/p\u003e\n\u003cp\u003eConsider fit and wearability alongside the technical spec. A 4-gas monitor a worker actually wears all shift protects them more than a larger one that gets set on the truck seat when the day gets busy. Utility line workers, HVAC service techs, plumbers, and confined-space-adjacent tradespeople typically choose the MINI. For fleet-safety programs where the monitor lives on a dedicated entry-team member or in a fixed monitoring station, the MICRO's larger physical case is often preferable. Same platform, different wearability profile — pick the one your crew will actually keep on their body.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the standard alarm setpoints for a confined-space 4-gas monitor?\u003c\/summary\u003e\n\u003cp\u003eUnder OSHA's permit-required confined-space entry standard (29 CFR 1910.146), the atmosphere is classified oxygen-deficient below 19.5% O2 and oxygen-enriched above 23.5% O2. For combustible gases, entry is prohibited when concentrations exceed 10% of the lower explosive limit (LEL). Toxic-gas alarms are set below OSHA's permissible exposure limits — for H2S, the OSHA ceiling is 20 ppm (29 CFR 1910.1000 Table Z-2); for CO, the 8-hour PEL is 50 ppm.\u003c\/p\u003e\n\u003cp\u003eThe SST4-MINI ships with configurable low, high, TWA, and STEL setpoints for each gas. Factory-set alarm points are documented in the specification sheet.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat's the difference between the LEL CAT and LEL NDIR variants?\u003c\/summary\u003e\n\u003cp\u003eCatalytic bead (CAT) is a traditional LEL sensor — well-proven, effective in standard oxygenated atmospheres, but requires oxygen in the sample stream to produce a reading. NDIR (Non-Dispersive Infrared) reads combustibles by absorbing an IR wavelength specific to the target hydrocarbon and does not require oxygen — which means it works in inerted atmospheres (nitrogen blankets, CO2 storage, semiconductor process spaces) where CAT sensors go blind.\u003c\/p\u003e\n\u003cp\u003eFor standard trades and confined-space work in normal atmospheres, LEL CAT is the mainstream choice at a lower cost. Spec the NDIR variant if any of your entries involve intentionally-inerted spaces. If you're unsure whether a given space is likely to be inerted, call PK Safety at 800.829.9580 and describe the work — we can help you pick the right sensor variant.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often should I bump test and calibrate the SST4-MINI?\u003c\/summary\u003e\n\u003cp\u003eBump test before every use — a quick check with a known gas concentration that confirms each sensor responds and the alarms fire. Calibration is a longer procedure that adjusts sensor readings against a certified gas concentration standard. Manufacturer recommendation for the SST4 platform is calibration every six months at minimum; many operators calibrate quarterly or after any alarm event.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect under 29 CFR 1910.146 recordkeeping.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST4-MINI work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST4-MINI is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. The SST-DOCK handles SST4-MINIs, SST4-MICROs, SST4-PUMPs, and SST1 series monitors interchangeably — one dock, one workflow across a mixed fleet.\u003c\/p\u003e\n\u003cp\u003eThe wireless-charging pad on the SST-DOCK connects to the SST4-MINI with no cable connectors — one docking session covers bump test, calibration, log upload, and battery charge in a single hands-off workflow.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST4-MINI after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST4-MINI with factory-trained technicians in-house. That covers sensor replacement, calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your 4-gas program with someone who understands trades-level confined-space and hands-full work — not a call-center script.\u003c\/p\u003e\n\u003cp\u003ePK Safety also handles BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof, so a mixed-brand fleet doesn't mean shipping to multiple service centers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether the SST4-MINI or the SST4-MICRO is right for your crew? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows trades-level 4-gas monitoring and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"LEL CAT\/O2\/CO\/H2S","offer_id":52187787198831,"sku":"WG01-SST4-MINI-X2OMH-Y","price":720.0,"currency_code":"USD","in_stock":true},{"title":"LEL NDIR\/O2\/CO\/H2S","offer_id":52187787231599,"sku":"WG01-SST4-MINI-X3OMH-Y","price":820.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST4MiniDiffusion800x800compressed.jpg?v=1772737868"},{"product_id":"watchgas-sst4-pump-4-gas-detector","title":"WatchGas SST4-PUMP 4-Gas Detector","description":"\u003cp\u003e\u003cstrong\u003ePermit-required confined-space entry starts with one absolute rule: test the atmosphere before anyone goes in.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe atmosphere in a tank, vault, sewer, silo, or ship hold might be at OSHA's entry criteria. It might be immediately dangerous to life and health. From outside, you can't tell. And once you enter to sample, you've already breathed whatever is in there.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST4-PUMP draws a sample from the space to the monitor, not the worker to the sample.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAttach a length of Last-o-More tubing (up to 20 feet), drop it into the space, hold the pump outside — and the monitor reads O2, LEL, CO, and H2S continuously as the pump draws air through the sensor stack. Under 29 CFR 1910.146(d)(5), this is the pre-entry atmospheric test the standard requires before a permit-required confined space can be classified for entry.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy entry attendants and confined-space safety managers standardize on the SST4-PUMP:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSample-draw architecture with bottom-mounted draw line — clean geometry for tank, vault, sewer, and silo pre-entry sampling\u003c\/li\u003e\n\u003cli\u003eSample tubing up to 20 feet — reach deep into a space without opening more than the entry point\u003c\/li\u003e\n\u003cli\u003eChoice of LPC (Low Power Catalytic) or NDIR (Non-Dispersive Infrared) LEL sensor at purchase — LPC for standard oxygenated confined-space work; NDIR for entries into inerted atmospheres (nitrogen blankets, CO2 storage, semiconductor process spaces) where the LPC sensor can't operate\u003c\/li\u003e\n\u003cli\u003eIncluded water trap filter — protects sensors from moisture in sewers, sewage networks, wet-well applications, and boiler-room sample lines\u003c\/li\u003e\n\u003cli\u003eIncluded internal particulate filters (5 replacements) plus sinter filter — catches dust and debris before it reaches the sensors\u003c\/li\u003e\n\u003cli\u003eSame platform as the SST4-MICRO — 95 dB alarm at 30 cm, largest LCD in category, NFC configuration from a mobile device, wireless charging, fastest T90 in class\u003c\/li\u003e\n\u003cli\u003e2-year warranty on the SST4 platform\u003c\/li\u003e\n\u003cli\u003eSST-DOCK compatible for automated bump test, calibration, and datalogged compliance workflow\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If a sensor drifts or reaches end-of-life, send the unit to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through the SST4-PUMP setup with someone who actually understands permit-required confined-space entry and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou are the entry attendant or safety manager responsible for the pre-entry atmospheric test under 29 CFR 1910.146(d)\u003c\/li\u003e\n\u003cli\u003eYou need to sample tanks, storage vessels, sewers, silos, ship holds, or utility vaults from outside before workers enter\u003c\/li\u003e\n\u003cli\u003eYou do entries into inerted atmospheres (nitrogen, CO2, argon blankets) — the NDIR variant is what you want; LPC won't work without oxygen present\u003c\/li\u003e\n\u003cli\u003eYou're standardizing your entry program on a single 4-gas platform — the SST4-PUMP pairs with SST4-MICRO diffusion monitors so attendant and entry-team members read the same gases the same way\u003c\/li\u003e\n\u003cli\u003eYou need a monitor with a water trap and particulate filtration for wet or dusty entries (wastewater, sewers, silos)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST4-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST4Pump-DS-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/09\/MKT-SST4Pump-QSG-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/11\/SST4-SST4Pump-SST5-MAN-ENG-v1.0.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Manual\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-026-sst4-pump-ir-automatic-calibration-procedure-applies-to-sst4-mini-pump-firmware-version-13-93-ALIsvBSg\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Technical note TN-026\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST4 Pump IR Automatic Calibration Procedure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eWG01-SST4-PUMP-X4OMH-Y — LEL LPC \/ O2 \/ CO \/ H2S, Low Power Catalytic sensor\u003cbr\u003eWG01-SST4-PUMP-X3OMH-Y — LEL NDIR \/ O2 \/ CO \/ H2S, Non-Dispersive Infrared sensor (for inerted atmospheres)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhen should I use a pump-draw monitor (SST4-PUMP) versus a diffusion monitor (SST4-MICRO)?\u003c\/summary\u003e\n\u003cp\u003eUse pump-draw for pre-entry atmospheric testing under 29 CFR 1910.146(d)(5) — sampling a permit-required confined space from outside before workers enter. The attendant lowers sample tubing into the space, and the pump draws atmosphere to the sensor stack. This lets you clear or reject entry without anyone breathing what's inside first.\u003c\/p\u003e\n\u003cp\u003eUse diffusion (worn on the entry-team member during the entry) for continuous personal exposure monitoring after entry criteria are met. Many operators pair the two — SST4-PUMP for the attendant's pre-entry test, SST4-MICRO diffusion monitors on the entry team once inside. Same 4-gas set on both, so alarms are consistent between attendant and entry team.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat's the difference between the LPC and NDIR LEL sensor variants?\u003c\/summary\u003e\n\u003cp\u003eLPC (Low Power Catalytic) is a refined catalytic bead sensor. It requires oxygen in the sample stream to combust the target gas and produce a reading — standard behavior in normal atmospheres, but LPC cannot read combustibles in an inerted atmosphere (nitrogen blanket, CO2 storage, argon-purged process vessel). LPC is longer-life and better poisoning-resistant than legacy catalytic beads.\u003c\/p\u003e\n\u003cp\u003eNDIR (Non-Dispersive Infrared) does not need oxygen to detect combustibles. It reads by absorbing an infrared wavelength specific to the target hydrocarbon. NDIR works in inerted atmospheres, is not vulnerable to catalytic poisoning (silicone, sulfur, tetraethyl lead), and reads different hydrocarbons at different sensitivities. If any of your entries involve inerted spaces, spec the NDIR variant. If not, LPC covers standard confined-space work at a lower cost.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow far can I sample with the SST4-PUMP's tubing?\u003c\/summary\u003e\n\u003cp\u003eThe SST4-PUMP can draw a sample through up to 20 feet of Last-o-More tubing. In practice, the effective sample distance depends on tubing diameter, ambient temperature, and the density of the target gas — heavier gases (H2S, SO2, hydrocarbons) settle in a space and can be pulled reliably from the bottom; lighter gases (hydrogen, methane) rise and may require sampling from multiple depths.\u003c\/p\u003e\n\u003cp\u003eFor a typical tank, vault, or vertical vessel: drop the sample line to near the bottom, wait 60–90 seconds for the pump to pull a stable reading, then raise the line in increments to characterize the atmospheric stratification. The Watchgas Quick Start Guide and Manual (linked above) document the specific flow rate and stabilization time.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST4-PUMP work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST4-PUMP is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. The SST-DOCK automates the compliance workflow with timestamped logs suitable for OSHA 29 CFR 1910.146 recordkeeping.\u003c\/p\u003e\n\u003cp\u003eThe wireless-charging pad on the SST-DOCK connects to the SST4-PUMP with no cable connectors — one docking session covers bump test, calibration, log upload, and battery charge in a single hands-off workflow. For a mixed fleet, one SST-DOCK handles SST4-MICROs, SST4-PUMPs, and SST1 series monitors interchangeably.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often should I bump test and calibrate the SST4-PUMP?\u003c\/summary\u003e\n\u003cp\u003eBump test before every use — a quick check with a known gas concentration that confirms each sensor responds and the alarms fire. Calibration is a longer procedure that adjusts sensor readings against a certified gas concentration standard. Manufacturer recommendation for the SST4 platform is calibration every six months at minimum; many operators calibrate quarterly or after any alarm event.\u003c\/p\u003e\n\u003cp\u003eSample-draw monitors get more sensor exposure than diffusion monitors because the pump actively pulls atmosphere across the sensor stack — meaning bump test discipline matters more, not less. The SST-DOCK automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST4-PUMP after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST4-PUMP with factory-trained technicians in-house. That covers sensor replacement, pump service, filter replacement (particulate, water trap, sinter), calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your confined-space entry program with someone who knows the SST4 platform and understands the entry attendant's job — not a call-center script.\u003c\/p\u003e\n\u003cp\u003ePK Safety also handles BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof, so a mixed-brand fleet doesn't mean shipping to multiple service centers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether the SST4-PUMP or SST4-MICRO is right for your entry program? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows permit-required confined-space entry and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"LEL LPC\/O2\/CO\/H2S","offer_id":52187787297135,"sku":"WG01-SST4-PUMP-X4OMH-Y","price":980.0,"currency_code":"USD","in_stock":true},{"title":"LEL NDIR\/O2\/CO\/H2S","offer_id":52187787329903,"sku":"WG01-SST4-PUMP-X3OMH-Y","price":1100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST4-Pump800x800compressed.jpg?v=1756318379"},{"product_id":"watchgas-docking-station-w-touchscreen-sst-dock","title":"WatchGas Docking Station w\/Touchscreen SST-DOCK","description":"\u003cp\u003e\u003cstrong\u003eKeeping gas monitors calibrated and inspection-ready gets harder as your fleet grows.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eManual calibration schedules break down the moment monitors leave the shop. A sensor drifts and nobody notices. A unit gets dropped and doesn't get reported. Compliance records lag. The audit questions get harder — and somebody has to answer them.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST-DOCK Touchscreen closes the gap between what you know about your fleet and what's actually happening in the field.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlug any WatchGas SST-series monitor into the docking station. In roughly 60 seconds, it runs a bump test, calibrates if needed, logs the result with timestamp and gas readings, and displays fleet-wide status on the touchscreen — which units are current, which are due, which failed. Connect it to WatchGas cloud software and the same picture is available from your phone, with alerts for expirations, alarms, and low test gas.\u003c\/p\u003e\n\u003cp\u003eIt's the closest thing in gas detection to a monitor that keeps its own calibration schedule.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy safety managers put this next to their coffee pot:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBump test + calibration in about 60 seconds per unit\u003c\/li\u003e\n\u003cli\u003eAutomatic data logging — compliance records without spreadsheets\u003c\/li\u003e\n\u003cli\u003eCompatible with the full WatchGas SST line (\u003ca href=\"https:\/\/pksafety.com\/collections\/shop?q=SST1\" title=\"WatchGas SST1 Gas Detectors\"\u003eSST1\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\" title=\"WatchGas SST4-MICRO\"\u003eSST4 Micro\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\" title=\"WatchGas SST4-MINI\"\u003eSST4 Mini\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\" title=\"WatchGas SST4-PUMP\"\u003eSST4 Pump\u003c\/a\u003e, and SST5)\u003c\/li\u003e\n\u003cli\u003eTouchscreen fleet dashboard + optional cloud connectivity for remote visibility\u003c\/li\u003e\n\u003cli\u003eUp to 100 calibrations per battery charge — portable, desk, or wall mount\u003c\/li\u003e\n\u003cli\u003eAlerts for expirations, alarms, and low test gas\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If a unit needs service, send it to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your fleet setup with someone who actually understands the SST line and the calibration workflow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou run a WatchGas SST fleet across job sites, trucks, or remote crews\u003c\/li\u003e\n\u003cli\u003eYou've been tracking calibration dates on spreadsheets, whiteboards, or memory\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready compliance logs without hiring a dedicated cal-tech\u003c\/li\u003e\n\u003cli\u003eYou want alerts for what's expiring before it expires\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST4-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2023\/04\/MKT-SSTDock-DS-V1.0-19.04.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/09\/MKT-SSTDock-QSG-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/02\/SST-DOCK-MAN-ENG-v1.0-2.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Manual\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e SST-Dock — SST Docking Station for SST1 \/ SST4 \/ SST4 Pumped, Touch Screen\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eThe WatchGas SST-DOCK is a touchscreen docking station that automates bump testing, calibration, and data logging for the WatchGas SST monitor line. Plug in an SST1, SST4 Micro, SST4 Mini, SST4 Pump, or SST5 monitor and the station runs a full test cycle in about 60 seconds, logs the result with timestamp and gas readings, and shows fleet-wide status on the touchscreen.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open\u003e\n\u003csummary\u003eHow long does one calibration cycle take?\u003c\/summary\u003e\n\u003cp\u003eAbout 60 seconds per unit. The station runs the bump test, calibrates if drift is detected, and logs the result with a timestamp and gas readings — all in a single cycle.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors does the SST-DOCK work with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-DOCK is compatible with the full WatchGas SST line: SST1 single-gas monitors, SST4 Micro, SST4 Mini, SST4 Pump, and SST5 multi-gas monitors. One docking station covers the entire fleet.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST-DOCK connect to cloud software?\u003c\/summary\u003e\n\u003cp\u003eYes. When connected to WatchGas cloud software, the SST-DOCK's calibration logs, expiration dates, alarm history, and low-test-gas alerts are available from a phone or laptop for remote fleet visibility.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the WatchGas SST-DOCK?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and can walk you through fleet setup, calibration workflow, and cloud connectivity. Call 800.829.9580 to talk with someone who knows the SST line.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST line will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52190092427631,"sku":"WG01-SST-DOCK","price":3150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST_Dock_docking_station_WatchGas-1-e1678368862860800x800comrpessed.jpg?v=1756393175"},{"product_id":"watchgas-docking-station-with-hard-case-sst-dock-kit","title":"WatchGas Docking Station with Hard Case SST-DOCK-KIT","description":"\u003cp\u003e\u003cstrong\u003eCalibration compliance falls apart at the last 20 miles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe problem isn't the cal station in the shop. The problem is what happens when your monitors don't come back to it — because the crew is 100 miles out on a two-week turnaround, the job site is a truck-stage-only operation, or you're running a fleet across three facilities and there's only one calibration desk. Deadlines slip. Sensors drift silently. Audit logs get patched together from memory after the fact.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST-DOCK-KIT is the docking station in a rugged hard case — designed to travel to the crew instead of waiting for the crew to come back.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSame touchscreen station as the desktop SST-DOCK. Same 60-second bump-and-cal cycle. Same automatic data logging with timestamps and gas readings. The difference is the hard case around it — molded fittings for two calibration gas cylinders and a demand-flow regulator, so the whole cal setup ships as one unit. Drop it in a service truck. Send it out to a job site with the crew. Rotate it between plants on a monthly schedule instead of buying a docking station for every site. The calibration schedule follows the monitors, and the compliance logs write themselves.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's in the case:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWatchGas \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\" title=\"WatchGas SST-DOCK Touchscreen Docking Station\"\u003eSST-DOCK Touchscreen docking station\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eRugged hard case with molded fittings for 2 cal gas cylinders + demand-flow regulator\u003c\/li\u003e\n\u003cli\u003eUp to 100 calibrations per battery charge\u003c\/li\u003e\n\u003cli\u003eFleet-status touchscreen dashboard, optional WatchGas cloud connectivity, alerts for expirations \/ alarms \/ low test gas\u003c\/li\u003e\n\u003cli\u003e2-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is NOT included (order separately):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCal gas cylinders — spec depends on which SST monitors you're calibrating (H2S, CO, O2, NH3, LEL, or a 4-gas mix)\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\" title=\"WatchGas Demand Flow Regulator w\/Pressure Sensor Valve\"\u003eWatchGas demand-flow regulator (DFR)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCall PK Safety at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e and we'll spec the right cylinders and DFR for your fleet before you order.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy fleet managers pick the KIT over the desktop SST-DOCK:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with the full WatchGas SST line (\u003ca href=\"https:\/\/pksafety.com\/collections\/shop?q=SST1\" title=\"WatchGas SST1 Gas Detectors\"\u003eSST1\u003c\/a\u003e single-gas, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\" title=\"WatchGas SST4-MICRO\"\u003eSST4 Micro\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\" title=\"WatchGas SST4-MINI\"\u003eSST4 Mini\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\" title=\"WatchGas SST4-PUMP\"\u003eSST4 Pump\u003c\/a\u003e, and SST5) — one kit calibrates a mixed-model fleet\u003c\/li\u003e\n\u003cli\u003eShip between multi-facility operations on a rotation schedule — one kit does the work of several desktop stations\u003c\/li\u003e\n\u003cli\u003eStage on a service truck for field cal on remote job sites — monitors don't have to travel back to a central desk\u003c\/li\u003e\n\u003cli\u003eAudit-ready compliance logs get written automatically at the point of calibration, not reconstructed later\u003c\/li\u003e\n\u003cli\u003eSame 60-second bump-and-cal cycle as the basic SST-DOCK — no separate training curve\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. If the docking station needs warranty support, if a monitor needs a sensor swap, or if you need help spec'ing the right cal gas and DFR for your fleet, call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e. Someone who actually knows the SST platform and the calibration workflow will pick up.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou run WatchGas SST monitors across dispersed job sites — turnarounds, service crews, contractor work, emergency response\u003c\/li\u003e\n\u003cli\u003eYou manage a fleet across multiple facilities and don't want to buy a docking station for each location\u003c\/li\u003e\n\u003cli\u003eYour crews stage from service trucks and cal deadlines get missed because monitors don't come back to a central shop\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready compliance logs written at the point of calibration, not patched together from memory\u003c\/li\u003e\n\u003cli\u003eYou've been tracking cal dates on spreadsheets or memory and it's not scaling with the fleet\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST4-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2023\/04\/MKT-SSTDock-DS-V1.0-19.04.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/09\/MKT-SSTDock-QSG-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/02\/SST-DOCK-MAN-ENG-v1.0-2.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Manual\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e SST-DOCK-KIT — SST Docking Station for SST1 \/ SST4 \/ SST4 Pumped, in Hard Case with Space for 2 Gas Cylinders and DFR\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat's the difference between the SST-DOCK-KIT and the desktop SST-DOCK?\u003c\/summary\u003e\n\u003cp\u003eSame touchscreen docking station. Same 60-second bump-and-cal cycle. Same automatic data logging. The difference is the hard case around it. The basic \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eSST-DOCK Touchscreen\u003c\/a\u003e is designed to live on a workbench, mount to a wall, or sit next to the coffee pot in the shop — it's the right choice when calibration happens in one place. The SST-DOCK-KIT packages that same station inside a rugged hard case with molded fittings for two cal gas cylinders and a demand-flow regulator, so the whole cal setup ships as one unit.\u003c\/p\u003e\n\u003cp\u003eChoose the KIT if calibration needs to travel — service trucks, remote job sites, or rotating between multi-facility operations. Choose the basic SST-DOCK if calibration lives in one location. Both handle the full WatchGas SST fleet identically. Call 800.829.9580 if you're unsure which fits your fleet.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat comes in the SST-DOCK-KIT?\u003c\/summary\u003e\n\u003cp\u003eThe SST-DOCK Touchscreen docking station and the rugged hard case with molded fittings for two calibration gas cylinders and a demand-flow regulator (DFR).\u003c\/p\u003e\n\u003cp\u003eCal gas cylinders and the DFR are ordered separately — they are gas-specific to the monitors you're calibrating. A single-gas SST1 fleet calibrated to H2S needs a different cylinder than an SST4 multi-gas fleet calibrated to a 4-gas mix. Call 800.829.9580 with your monitor list and we'll spec the cylinders and regulator that fit before you order.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors does the SST-DOCK-KIT work with?\u003c\/summary\u003e\n\u003cp\u003eThe full WatchGas SST line — \u003ca href=\"https:\/\/pksafety.com\/collections\/shop?q=SST1\"\u003eSST1 single-gas monitors\u003c\/a\u003e (H2S, CO, O2, NH3, and other gas variants), \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4 Micro\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4 Mini\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4 Pump\u003c\/a\u003e, and SST5. One docking station handles a mixed-model fleet — you don't need a separate cal setup for each SST model.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST-DOCK-KIT support multi-site fleet management?\u003c\/summary\u003e\n\u003cp\u003eTwo patterns show up most often. The first is \u003cstrong\u003eship-between-locations\u003c\/strong\u003e: one kit rotates across facilities on a monthly or quarterly schedule so you're not buying a docking station for every site. The second is \u003cstrong\u003efield-deployable\u003c\/strong\u003e: the kit stages on a service truck or ships out to a job site with the crew, so cal deadlines don't wait for monitors to return to a central shop.\u003c\/p\u003e\n\u003cp\u003eWhen the kit is connected to WatchGas cloud software, the fleet-status dashboard travels with it — expiration alerts, calibration history, alarm logs, and low-test-gas warnings are visible from a phone or laptop regardless of which site the kit is currently plugged in at.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat cal gas cylinders and demand-flow regulator do I need with the kit?\u003c\/summary\u003e\n\u003cp\u003eThe cal gas depends on which SST monitors you're calibrating and which gases they read. As a rule of thumb: single-gas SST1 monitors need a cylinder that matches the target gas (H2S, CO, O2, NH3, LEL, etc.); multi-gas SST4 monitors typically use a 4-gas calibration mix (usually H2S \/ CO \/ O2 \/ LEL combined). The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003eWatchGas demand-flow regulator\u003c\/a\u003e matches the cylinder valve and controls flow into the docking station.\u003c\/p\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 with your monitor list and we'll spec the right cylinders and DFR for your fleet before you order. Getting this right up front saves shipping the wrong cylinders back and re-ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST-DOCK-KIT after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the platform with factory-trained technicians in-house. That covers monitor calibration, sensor replacement, firmware updates, docking station warranty support, and cal-workflow setup questions.\u003c\/p\u003e\n\u003cp\u003eWe also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof — one shop for a mixed-brand fleet. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e with any calibration workflow, fleet setup, or spec questions. A person who knows the SST platform will pick up.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether the SST-DOCK-KIT or the desktop SST-DOCK fits your operation? Call PK Safety at 800.829.9580.\u003c\/strong\u003e Someone who knows the WatchGas SST platform and the calibration workflow will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52190092394863,"sku":"WG01-SST-DOCK-KIT","price":3750.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-Dock-Kit-800x800compressed.jpg?v=1756393175"},{"product_id":"watchgas-demand-flow-regulator-w-pressure-sensor-valve","title":"WatchGas Demand Flow Regulator w\/Pressure Sensor Valve","description":"\u003cp\u003e\u003cstrong\u003eA monitor is only as trustworthy as its last calibration. And a calibration is only as accurate as the flow of cal gas that produced it.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas Demand Flow Regulator with Pressure Sensor Valve (SST-DFRPSV) is the professional calibration workflow accessory for the pump-drawn \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e. It regulates the flow of cal gas from a calibration cylinder to the monitor during bump tests and full calibrations, and it includes an integrated Pressure Sensor Valve for cylinder-pressure monitoring during the cal cycle.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDemand flow vs fixed flow: why the regulator type matters for pump-drawn monitors.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCalibration gas regulators come in two operating models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed-flow regulators\u003c\/strong\u003e release cal gas at a preset flow rate (typically 0.25–0.5 LPM) as long as the cylinder valve is open — continuously, whether the monitor is drawing sample or not.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDemand flow regulators\u003c\/strong\u003e like the SST-DFRPSV only release cal gas when the monitor's sampling pump pulls it. The pump creates negative pressure at the regulator inlet; the regulator senses that draw and opens on demand. When the pump stops, so does the gas flow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor pump-drawn monitors like the SST4-PUMP, demand flow is the accuracy standard — the pump's sample rate and the regulator's delivery rate are exactly matched because the pump itself is what triggers the delivery. Fixed-flow regulators can create a flow mismatch (regulator releasing more or less than the pump is drawing) that shows up as calibration drift over time.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCal gas cost savings for high-cycle cal shops.\u003c\/strong\u003e Fixed-flow regulators keep releasing gas between bump-test cycles, while you document the last calibration, and while switching monitors on the bench. In a high-cycle calibration operation running dozens of bump tests per week, that steady-state waste materially offsets the higher up-front cost of a demand flow regulator. The ROI arrives faster than most operators expect.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePressure Sensor Valve (PSV):\u003c\/strong\u003e integrated cylinder-pressure monitoring during the cal cycle. The PSV is an on-regulator safety and monitoring layer that supports proper cylinder management — detecting low-pressure conditions and helping ensure that a fully-depleted cylinder isn't producing an inaccurate calibration. Consult the WatchGas specification for exact PSV functionality, or call PK Safety at 800.829.9580 to walk through how the PSV integrates into your calibration workflow.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this regulator is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a demand flow cal gas regulator with integrated Pressure Sensor Valve, engineered for professional calibration workflows on pump-drawn gas monitors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e designed for the WatchGas SST4-PUMP calibration workflow — the pump-drawn monitor whose sampling behavior demand flow regulators are built for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e part of the WatchGas SST4-PUMP sampling ecosystem alongside the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-ball-float-tubing-not-included-sst-ball-float\"\u003eSST-BALL-FLOAT\u003c\/a\u003e (water-intake protection) and the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-411-0018-038\"\u003eSST-3X5-LASTOMORE Sampling Tubing\u003c\/a\u003e (3x5mm tubing, sold by the meter).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a fixed-flow regulator. If your calibration workflow uses diffusion monitors (SST4-MICRO, SST4-MINI, or SST1 single-gas), a fixed-flow regulator is the appropriate choice for those — diffusion monitors don't have an internal pump to trigger demand flow. Call PK Safety at 800.829.9580 for a fixed-flow regulator recommendation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a cal gas cylinder. The regulator threads onto a standard cal gas cylinder valve; the cylinder itself is a separate purchase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a substitute for a documented calibration procedure. Bump test cadence, span gas verification, and cal record documentation still apply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDemand flow regulation\u003c\/strong\u003e — gas flow triggered by the monitor's pump draw; precise flow matching for accurate calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Pressure Sensor Valve (PSV)\u003c\/strong\u003e — on-regulator cylinder-pressure monitoring during cal cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCal gas cost savings\u003c\/strong\u003e — no continuous release between cycles; material savings in high-volume cal operations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional calibration workflow tool\u003c\/strong\u003e — designed for in-house cal benches, third-party cal service providers, and ISO 17025 accredited labs\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with WatchGas SST4-PUMP monitors\u003c\/strong\u003e — the pump-drawn variant of the SST4 family\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-DFRPSV:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn-house calibration benches\u003c\/strong\u003e at industrial facilities running fleets of SST4-PUMP monitors — refinery safety departments, chemical plant EHS, wastewater agency safety operations, oil \u0026amp; gas company field-service depots\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThird-party calibration service providers\u003c\/strong\u003e — companies offering bump testing and full calibration to smaller SST4-PUMP customers as a service\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFleet-service depot cal shops\u003c\/strong\u003e — utility field-service contractors, oil \u0026amp; gas service companies, industrial contractors with in-house cal capability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire department and emergency response calibration programs\u003c\/strong\u003e — documented in-cal status required before every deployment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO 17025 accredited calibration laboratories\u003c\/strong\u003e — precision regulators are lab-accreditation infrastructure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety compliance officers\u003c\/strong\u003e — owners of calibration record-keeping for OSHA and customer audits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety supports the full WatchGas SST4-PUMP calibration workflow.\u003c\/strong\u003e If you're standardizing an in-house cal bench, upgrading from fixed-flow to demand flow regulators across a monitor fleet, or planning a third-party calibration service offering, call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e. We stock cal gas cylinders in the concentrations you need for LEL \/ O2 \/ CO \/ H2S calibration, we can quote multi-unit regulator orders for a full cal shop rollout, and factory-trained technicians can walk through calibration workflow design for the WatchGas SST4-PUMP platform. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's calibration workflow.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cem\u003eManufacturer specification documents for the SST-DFRPSV are available on request — call PK Safety at 800.829.9580 or email us for the current WatchGas specification and integration guide.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-DFRPSV — WatchGas Demand Flow Regulator with Pressure Sensor Valve, for SST4-PUMP calibration workflow (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is a demand flow regulator, and how is it different from a fixed-flow regulator?\u003c\/summary\u003e\n\u003cp\u003eCalibration gas regulators come in two operating models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed-flow regulators\u003c\/strong\u003e release cal gas at a preset flow rate (typically 0.25–0.5 LPM) as long as the cylinder valve is open. Simple mechanism, well-understood, appropriate for diffusion monitors that don't have an internal pump.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDemand flow regulators\u003c\/strong\u003e like the SST-DFRPSV only release cal gas when the monitor's sampling pump pulls it. The pump creates negative pressure at the regulator inlet; the regulator opens on demand. When the pump stops, the gas flow stops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor pump-drawn monitors like the SST4-PUMP, demand flow is the accuracy standard because the pump's sample rate and the regulator's delivery rate are exactly matched by construction — the pump itself is what triggers delivery. Fixed-flow regulators can create a flow mismatch (regulator releasing more or less than the pump draws) that shows up as calibration drift over time.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDo I need one for my SST4-PUMP monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-DFRPSV is the demand-flow calibration regulator designed for the WatchGas SST4-PUMP calibration workflow. If you're running an in-house calibration bench for SST4-PUMP monitors and you want the accuracy standard that pump-drawn calibration warrants, yes.\u003c\/p\u003e\n\u003cp\u003eFor operators who send monitors out to a third-party cal shop instead of running in-house cal, the cal shop's regulator infrastructure covers this need — you don't need to own a demand flow regulator to have your monitor properly calibrated. But if you're documenting your own cal records for compliance, running dozens of bump tests per week, or building an in-house cal capability for a larger fleet, the SST-DFRPSV is a foundational piece of equipment.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does the Pressure Sensor Valve do?\u003c\/summary\u003e\n\u003cp\u003eThe Pressure Sensor Valve (PSV) is an integrated cylinder-pressure monitoring layer on the regulator. Its function is to help ensure that calibrations are performed with cal gas at appropriate cylinder pressure — a nearly-empty cylinder can produce inconsistent calibration behavior even if the regulator itself is functioning correctly.\u003c\/p\u003e\n\u003cp\u003eExact PSV functionality (pressure thresholds, alarm behavior, integration with the calibration workflow) is covered in the WatchGas SST-DFRPSV specification documents. For a walkthrough of the PSV in the context of your specific calibration workflow, call PK Safety at 800.829.9580.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich cal gas cylinders does the SST-DFRPSV thread onto?\u003c\/summary\u003e\n\u003cp\u003eThe SST-DFRPSV threads onto a standard calibration gas cylinder valve. The specific thread type (CGA connection number) depends on the gas being delivered — different cal gases use different CGA outlets per Compressed Gas Association safety standards (e.g., CGA-600 for many single-gas cal cylinders, CGA-590 for others).\u003c\/p\u003e\n\u003cp\u003ePK Safety stocks WatchGas-compatible cal gas cylinders in the concentrations needed for LEL \/ O2 \/ CO \/ H2S calibration on the SST4-PUMP. Call us at 800.829.9580 with your specific cal gas requirements and we'll confirm the correct cylinder + regulator connection for your workflow.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow much cal gas does demand flow save compared to fixed flow?\u003c\/summary\u003e\n\u003cp\u003eThe savings depend on your cal cycle behavior, but the typical savings pattern:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFixed-flow at 0.5 LPM releases gas continuously while the cylinder is open — including between bump tests, while you're documenting the last cal, while you're switching monitors on the bench\u003c\/li\u003e\n\u003cli\u003eDemand flow releases gas ONLY when the monitor's pump is actively drawing (typically 30–60 seconds per bump test, and a few minutes per full cal)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn a high-cycle cal-shop workflow running 30–50 bump tests per week, demand flow can reduce cal gas consumption by 40–60% vs continuous fixed-flow use. At the price of professional-grade cal gas cylinders (mixed 4-gas cylinders can run $150–$300+ per cylinder), the cal gas savings offset the regulator's higher up-front cost typically within months of cal-shop operation.\u003c\/p\u003e\n\u003cp\u003eFor lower-cycle operations (fewer than ~10 bump tests per week), the ROI story is weaker — but the accuracy story still holds. Call PK Safety at 800.829.9580 to talk through the economics for your specific cal-cycle volume.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eIs demand flow required for a proper bump test \/ calibration, or is fixed flow acceptable?\u003c\/summary\u003e\n\u003cp\u003eBoth fixed flow and demand flow can produce valid calibrations on pump-drawn monitors when used correctly. But demand flow is the accuracy standard for pump-drawn monitors because it eliminates the flow-mismatch failure mode.\u003c\/p\u003e\n\u003cp\u003eFor diffusion monitors (SST4-MICRO, SST4-MINI, SST1 single-gas), fixed flow is the right choice — those monitors don't have an internal pump to trigger demand flow.\u003c\/p\u003e\n\u003cp\u003eFor ISO 17025 accredited cal labs, precision cal gas delivery is a lab-accreditation infrastructure requirement, and demand flow is the practical standard for pump-drawn monitor cal.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I use the SST-DFRPSV with diffusion monitors (SST4-MICRO, SST4-MINI, SST1)?\u003c\/summary\u003e\n\u003cp\u003eNo. Demand flow regulators are triggered by the monitor's sampling pump. Diffusion monitors (SST4-MICRO, SST4-MINI, SST1 single-gas) don't have an internal pump — they rely on ambient gas diffusion to reach the sensors. Without a pump to create negative pressure at the regulator inlet, the demand flow mechanism has nothing to open.\u003c\/p\u003e\n\u003cp\u003eFor diffusion monitor calibration, use a fixed-flow regulator. Call PK Safety at 800.829.9580 for a fixed-flow regulator recommendation for your diffusion monitors.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST-DFRPSV fit into the full WatchGas SST4-PUMP sampling ecosystem?\u003c\/summary\u003e\n\u003cp\u003eThe pump-drawn sampling ecosystem for the SST4-PUMP includes three complementary WatchGas accessories, each sold separately:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-ball-float-tubing-not-included-sst-ball-float\"\u003e\u003cstrong\u003eSST-BALL-FLOAT\u003c\/strong\u003e\u003c\/a\u003e — water-intake protection at the sampling-tube intake end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSST-DFRPSV\u003c\/strong\u003e (this SKU) — demand flow cal gas regulator with PSV for calibration workflow\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-sst-3x5-lastomore\"\u003e\u003cstrong\u003eSST-3X5-LASTOMORE\u003c\/strong\u003e\u003c\/a\u003e — 3x5mm sampling tubing sold by the meter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor a complete confined-space sampling and calibration setup on a WatchGas SST4-PUMP, order all three. Call PK Safety at 800.829.9580 for a bundle quote or to walk through the full workflow.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eStandardizing an in-house calibration bench for WatchGas SST4-PUMP monitors, or planning a fleet-scale cal-shop upgrade? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST4-PUMP calibration workflow, cal gas cylinder selection, and cal-shop economics will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52190083219823,"sku":"WG01-SST-DFRPSV","price":390.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-DFRPSV---Demand-Flow-Regulator-with-Sensor-0-to-3-L_Mn---70-bar-max-1---K1E800x800compressed.jpg?v=1784919134"},{"product_id":"watchgas-sst-kiosk-sst-kiosk","title":"WatchGas SST Kiosk SST-KIOSK","description":"\u003cp\u003e\u003cstrong\u003eFleet compliance shouldn't require chasing down 40 monitors. The WatchGas SST Compliance Kiosk gives every worker on your fleet a self-serve check-in point — device status, alarm history, user assignment, and location, uploaded to your fleet software automatically.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you're managing gas monitors across shifts and job sites, you know the compliance-check treadmill: paper logs that get lost, spreadsheet reconciliations at month-end, calibration dates that slip because nobody's watching all 40 monitors in real time. When an audit lands, you're piecing the story together after the fact.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe SST Kiosk is the fleet-visibility layer of the WatchGas SST platform.\u003c\/strong\u003e Workers dock a monitor into the kiosk terminal; the kiosk reads device status, alarm history, and event log; and it uploads that data automatically to your WatchGas fleet software. Every check-in gets timestamped and tagged to the worker. Your fleet dashboard reflects real-time operational status instead of end-of-month paper reconciliation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow the SST Kiosk differs from the SST-DOCK docking station:\u003c\/strong\u003e the two products cover different layers of your fleet infrastructure. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e is the maintenance layer — automatic bump testing and calibration in about 60 seconds per monitor with fresh cal gas from a cylinder. The SST Kiosk is the reporting and accountability layer — it does NOT bump test or calibrate; it verifies configuration, checks device health, uploads alarm history, and tracks user\/location assignment. Most WatchGas SST fleets use both: SST-DOCK to keep monitors ready, SST Kiosk to know what's happening in the field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatible across the full WatchGas SST portfolio:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1 single-gas monitor series\u003c\/a\u003e (H2S, CO, O2, NH3, SO2, PH3, methanethiol, H2, and other cross-sensitivity variants)\u003c\/li\u003e\n\u003cli\u003eThe WatchGas SST4 multi-gas monitor series — \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4-MICRO\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI\u003c\/a\u003e, and \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eWatchGas SST5 monitors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOne kiosk supports a mixed-instrument fleet — SST1 single-gas alongside SST4 multi-gas, no separate infrastructure required.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat the kiosk does at each check-in:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDevice configuration verification — spot mis-configured settings before they cause alarm confusion in the field\u003c\/li\u003e\n\u003cli\u003eReal-time health check on battery, sensor readiness, and firmware\u003c\/li\u003e\n\u003cli\u003eAlarm history upload — every event with timestamp, exceeded threshold, and duration\u003c\/li\u003e\n\u003cli\u003eUser assignment — know which worker had which monitor when\u003c\/li\u003e\n\u003cli\u003eMultiple mounting options — wall, benchtop, or purpose-built kiosk stand for locker rooms and shift-change points\u003c\/li\u003e\n\u003cli\u003e2-year warranty on the kiosk itself\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e Firmware updates, kiosk configuration support, connectivity troubleshooting with your WatchGas fleet software, warranty coverage on the kiosk and the connected monitors — you're calling a real person, not a call-center script. We also handle BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your fleet configuration with someone who understands the WatchGas SST platform end-to-end.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou manage a fleet of 20+ WatchGas SST monitors across shifts, sites, or crews\u003c\/li\u003e\n\u003cli\u003eYou want compliance data uploaded automatically instead of tracked on paper or spreadsheets\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready logs of which worker used which monitor when\u003c\/li\u003e\n\u003cli\u003eYou already run (or plan to run) the SST-DOCK for bump\/cal and want to close the tracking loop with a fleet check-in terminal\u003c\/li\u003e\n\u003cli\u003eYou're operating in an environment with dispersed crews — refinery, chemical plant, wastewater treatment, oil \u0026amp; gas midstream, mining, industrial refrigeration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST Accessories Brochure\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2023\/08\/MKT-KIOSK-DS-V1.0.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/07\/MKT-KIOSK-QSG-V1.1.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-KIOSK — SST Compliance Kiosk for the WatchGas SST monitor platform\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does the WatchGas SST Compliance Kiosk actually do?\u003c\/summary\u003e\n\u003cp\u003eThe SST Kiosk is the fleet-visibility layer of the WatchGas SST monitoring platform. Workers dock a monitor into the kiosk terminal; the kiosk reads device status, alarm history, and event log; and it uploads that data automatically to your WatchGas fleet software. Every check-in gets timestamped and tagged to the worker.\u003c\/p\u003e\n\u003cp\u003eThink of the kiosk as your daily compliance check-in point across a distributed fleet — the reporting layer that answers \"what happened on our monitors today?\" without waiting for a monitor to come back to a central desk for review.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is the SST-KIOSK different from the SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eThe two products serve different roles in your fleet infrastructure and are commonly used together.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e is the maintenance layer — automatic bump testing and calibration in about 60 seconds per monitor, with fresh cal gas from an attached cylinder.\u003c\/p\u003e\n\u003cp\u003eThe SST-KIOSK is the tracking and reporting layer — it does NOT bump test or calibrate. It verifies configuration, checks device health, uploads alarm history, and tracks user\/location assignment to your fleet software.\u003c\/p\u003e\n\u003cp\u003eMost WatchGas SST fleets use both: SST-DOCK to keep monitors ready for the shift, SST-KIOSK to know what's happening across the fleet in real time. Neither replaces the other.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors are compatible with the SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003eThe SST-KIOSK supports the full WatchGas SST portfolio: the SST1 single-gas monitor series (including H2S, CO, O2, NH3, SO2, PH3, methanethiol, H2, and other cross-sensitivity variants), the SST4 multi-gas monitor series (SST4-MICRO, SST4-MINI, SST4-PUMP), and SST5 monitors.\u003c\/p\u003e\n\u003cp\u003eOne kiosk supports a mixed-instrument fleet — you don't need separate infrastructure for single-gas versus multi-gas monitors.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhere should the SST-KIOSK be installed?\u003c\/summary\u003e\n\u003cp\u003eAnywhere your workers pass through at the start or end of a shift. Common installation points include locker rooms and PPE stations, safety office check-in counters, break rooms adjacent to the operating floor, control-room check-in points, and gate-house entry stations.\u003c\/p\u003e\n\u003cp\u003eMultiple mounting options are supported — wall-mount, benchtop, or a purpose-built kiosk stand. Choose the location that puts the kiosk in the natural path of every worker rotating monitors in and out of the field.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat data does the SST-KIOSK upload to your fleet software?\u003c\/summary\u003e\n\u003cp\u003eEach check-in uploads device configuration, health check status (battery, sensor readiness, firmware version), alarm events with timestamps and exceeded thresholds, user assignment (which worker used which monitor), and location tags.\u003c\/p\u003e\n\u003cp\u003eThe upload is automatic — no manual data entry, no paper logs, no spreadsheet reconciliation. Your fleet dashboard reflects real-time operational status suitable for internal safety reviews and external compliance audits.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST-KIOSK after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST platform with factory-trained technicians in-house. That includes firmware updates, kiosk configuration support, connectivity troubleshooting with your WatchGas fleet software, sensor service and calibration on the monitors connected to your kiosk fleet, and warranty support (2-year warranty on the SST-KIOSK).\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your fleet setup with someone who understands the WatchGas SST platform end-to-end — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit for your fleet? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who understands WatchGas SST fleet infrastructure will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52190082040175,"sku":"WG01-SST-KIOSK","price":1950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-KIOSK-800x800compressed.jpg?v=1756318553"},{"product_id":"watchgas-sst1-2-year-o2-gas-detector-sst1-o-24","title":"WatchGas SST1 2 Year O2 Gas Detector SST1-O-24","description":"\u003cp\u003e\u003cstrong\u003eNot every O2 monitor needs to give you a percentage readout. Sometimes the job just needs a badge that alarms when the atmosphere isn't breathable — no calibration schedule, no battery replacement cycle, no training curve. That's what the SST1 Limited-Life line is for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOxygen depletion is the danger that hides in plain sight.\u003c\/strong\u003e The gases that displace O2 in industrial settings — nitrogen, argon, helium, carbon dioxide, methane — are colorless and odorless. Workers get no sensory warning that oxygen levels are falling. And unlike CO or H2S where symptoms give some warning, O2 depletion has a nasty physiology: cognitive impairment begins around 16% oxygen, workers stop recognizing they're in danger by ~12%, and unconsciousness can occur within minutes at 8%. The monitor is the only warning because the physiology itself impairs the judgment needed to notice.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 2-Year O2 gas detector is an alert-only monitor: no digital percentage display, factory-set alarm setpoints anchored to OSHA's confined-space atmosphere classifications, non-serviceable, and no maintenance required. Activate it once, and it runs continuously for two years — no calibration, no battery replacement, no charging — alarming immediately when oxygen falls below 19.5% (deficient) or rises above 23.5% (enriched). At $150, it's the lowest-cost O2 monitor in the SST1 line — designed for jobs that finish inside two years.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTwo ways to run O2 monitoring — pick the one that fits your job.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe SST1 O2 line covers both tiers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-instrument, serviceable:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-o2-gas-detector-sst1-o\"\u003eWatchGas SST1-O serviceable O2 monitor\u003c\/a\u003e — digital percentage readout, configurable low\/high\/TWA\/STEL alarms, replaceable sensor cell at end-of-life, integration with the WatchGas SST platform. Higher upfront cost; lowest lifecycle cost when the monitor stays in service for years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLimited-life, alert-only (this SKU):\u003c\/strong\u003e $150, no display, factory-set alarms at OSHA's confined-space thresholds, no maintenance for two years, discarded at end-of-life. Simpler operation; ideal for jobs where a full instrument is over-spec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFactory-set alarm thresholds, anchored to OSHA's confined-space atmosphere classifications:\u003c\/strong\u003e Low 19.5% and High 23.5% match exactly to OSHA's regulatory definitions under 29 CFR 1910.146 — the Permit-Required Confined Spaces standard. Below 19.5% is classified as an oxygen-deficient atmosphere; above 23.5% is classified as oxygen-enriched (fire and combustion risk). When the SST1-O-24 alarms, the atmosphere has crossed a specific OSHA-defined boundary. Because the setpoints are factory-set, you don't need to train workers on setpoint programming, and there's no risk of accidentally reconfiguring a monitor away from a compliant threshold in the field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST1-O-24 for O2 monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConfined-space entry teams on refinery, chemical plant, or process-vessel turnarounds where inert-atmosphere risk is real\u003c\/li\u003e\n\u003cli\u003eFood and beverage packaging operations using nitrogen — modified-atmosphere packaging, meat processing, produce cold storage\u003c\/li\u003e\n\u003cli\u003eBreweries and wineries handling fermentation CO2 in cellars and enclosed fermentation rooms\u003c\/li\u003e\n\u003cli\u003eCryogenics operations — LOX (liquid oxygen) and LN2 (liquid nitrogen) storage and dispensing where boil-off can displace atmospheric oxygen\u003c\/li\u003e\n\u003cli\u003eSemiconductor fabs with nitrogen-purged reactors, CVD processes, and cleanroom areas\u003c\/li\u003e\n\u003cli\u003ePharmaceutical facilities with inert-atmosphere reactors and process areas\u003c\/li\u003e\n\u003cli\u003eMedical gas facilities — O2 storage, distribution, and manifold operations\u003c\/li\u003e\n\u003cli\u003eFire investigation crews on structure fires where post-fire O2 depletion in enclosed spaces is a real risk\u003c\/li\u003e\n\u003cli\u003eMine rescue and industrial rescue teams needing low-cost grab-and-go O2 monitoring for atmosphere assessment during entry\u003c\/li\u003e\n\u003cli\u003eTraining programs using disposable monitors for teaching confined-space entry protocols\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eO2 (2-year fixed life)\u003c\/td\u003e\n\u003ctd\u003e0 – 25.0% by volume\u003c\/td\u003e\n\u003ctd\u003e19.5% \u003cem\u003e(OSHA oxygen-deficient threshold)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e23.5% \u003cem\u003e(OSHA oxygen-enriched threshold)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e The SST1 Limited-Life alert-only monitors don't require calibration during their fixed lifespan (the whole point of the design), but if you're mixing them with a fleet of the serviceable SST1 line — or with any other gas detectors — PK Safety supports the full WatchGas SST platform, plus BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your O2 monitoring workflow with someone who understands both product tiers of the SST1 line and can help you pick the right one for the job.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant lifecycle notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e One year shelf life (unactivated) then two years from activation date. Your operational clock starts the moment you turn the monitor on for the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce activated, the monitor cannot be shut down.\u003c\/strong\u003e It continues to run for its full two-year life span, and cannot be returned or shipped once activated (an alarm during transit is possible). Unactivated monitors can be returned normally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot resellable after activation.\u003c\/strong\u003e Buy for a specific worker or crew; the monitor stays with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe display shows MM and DD\u003c\/strong\u003e — months and days remaining before the monitor expires — not the current oxygen level.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-DS-V1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-QSG-V1.7.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-2-3-YEAR-MAN-ENG-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-O-24 — SST1-O-24 0–25% VOL 2-year fixed life (oxygen)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST1-O-24 alert-only monitor differ from the full-instrument SST1-O?\u003c\/summary\u003e\n\u003cp\u003eThe SST1 O2 line offers two tiers, and this is the alert-only tier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisplay and configuration:\u003c\/strong\u003e the SST1-O-24 has no digital percentage display and no user-configurable alarm setpoints — it shows months and days remaining on its lifespan and alarms when oxygen crosses either factory-set threshold. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-o2-gas-detector-sst1-o\"\u003eWatchGas SST1-O serviceable O2 monitor\u003c\/a\u003e shows continuous percentage readouts and offers configurable low\/high\/TWA\/STEL alarms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor lifecycle:\u003c\/strong\u003e the SST1-O-24 is non-serviceable, discarded at end-of-life after two years of continuous operation, and priced at $150 — the lowest entry point in the SST1 O2 line. The full-instrument SST1-O is serviceable — the sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eChoose the SST1-O-24 for shorter-commitment jobs (single-project confined-space work, training programs, temporary rescue-team inventory). Choose the SST1-O for fleets that stay in continuous service across multiple sensor generations. Note: unlike the SST1-H and SST1-M lines, PK Safety does not currently carry a 3-year O2 variant.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the factory-set alarm thresholds, and how do they align with OSHA?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-O-24 ships with factory-set alarms of Low 19.5% and High 23.5%. Both are anchored to OSHA's confined-space atmosphere classifications, which are the primary regulatory reference for oxygen monitoring in U.S. industrial settings:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBelow 19.5%\u003c\/strong\u003e is classified as an oxygen-deficient atmosphere under OSHA's Permit-Required Confined Spaces standard, 29 CFR 1910.146. Below this threshold, the atmosphere is not safe for entry without supplemental respiratory protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbove 23.5%\u003c\/strong\u003e is classified as oxygen-enriched. This is a fire and combustion risk, not a respiratory hazard — elevated O2 dramatically accelerates combustion of materials that would otherwise burn slowly or not at all.\u003c\/p\u003e\n\u003cp\u003eThe SST1-O-24's alarms match those OSHA classifications exactly. Because the setpoints are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field.\u003c\/p\u003e\n\u003cp\u003eNote that OSHA does not set a Permissible Exposure Limit (PEL) for oxygen in the way it does for toxic gases like H2S or CO — oxygen isn't a toxin. The regulatory framework for O2 monitoring is atmospheric classification, not exposure limits.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is oxygen depletion so dangerous — and why can't workers detect it?\u003c\/summary\u003e\n\u003cp\u003eOxygen depletion is the danger that hides in plain sight. The gases that typically displace O2 in industrial settings — nitrogen, argon, helium, carbon dioxide, methane — are colorless and odorless. Workers get no sensory warning that oxygen levels are falling.\u003c\/p\u003e\n\u003cp\u003eThe physiology of hypoxia makes it worse. Unlike CO exposure (which triggers headache and dizziness workers can notice) or H2S exposure (which has a rotten-egg smell at low ppm), oxygen depletion impairs the very cognitive function needed to recognize the danger. At around 16% oxygen, cognitive function starts to decline. By 12%, workers typically stop recognizing they're in danger and can even feel euphoric or unconcerned. At 8% or below, unconsciousness can occur within minutes without warning.\u003c\/p\u003e\n\u003cp\u003eA continuous instrument alarm is the only reliable warning. Whether you use a full-instrument SST1-O for continuous percentage readouts or an alert-only SST1-O-24 for factory-set threshold alarming, the monitor is the difference between recognizing a hazardous atmosphere in time and getting caught by it.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"2-year\" actually mean? When does the clock start?\u003c\/summary\u003e\n\u003cp\u003eThe lifecycle has two phases. Before activation, the monitor has a one-year shelf life (from manufacture date) during which it can sit unactivated in a warehouse or on a shelf without draining any capability. Once you press the activation button for the first time, the monitor runs continuously for two years — no user intervention required, no calibration, no battery replacement, no charging.\u003c\/p\u003e\n\u003cp\u003eThe display shows MM (months) and DD (days) remaining on the monitor's operational life so workers can see how much time is left. At the end of the two-year lifespan, the monitor stops functioning and gets discarded.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-O-24 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003ePartially. The SST1-O-24 can be bump-tested using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e — useful for verifying the monitor still alarms correctly at a given point in its two-year lifespan. However, it cannot be calibrated (the factory-set thresholds are permanent by design).\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e compliance kiosk can check in the SST1-O-24 and log its alarm-event history and remaining lifespan to fleet software — same as the full-instrument SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-O-24 after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line, including both tiers of O2 monitoring (serviceable SST1-O and 2-year SST1-O-24). Since the SST1-O-24 doesn't require calibration or maintenance during its fixed two-year lifespan, post-sale support is primarily replacement (when a unit approaches end-of-life) and mixed-fleet coordination if you're running Limited-Life alongside full-instrument SST1 monitors or other brands.\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your O2 monitoring workflow with someone who understands both tiers of the SST1 line — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST1 O2 tier fits your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the serviceable \/ alert-only choice will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52202397008239,"sku":"WG01-SST1-O-24","price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-O2-24800x800compressed.jpg?v=1757013256"},{"product_id":"watchgas-sst1-2-year-so2-gas-detector-sst1-s-24","title":"WatchGas SST1 2 Year SO2 Gas Detector SST1-S-24","description":"\u003cp\u003e\u003cstrong\u003eNot every SO2 monitor needs to give you a number. Sometimes the job just needs a badge that alarms when sulfur dioxide exceeds a compliance threshold — no calibration schedule, no battery replacement cycle, no configuration menu to train workers on. That's what the SST1 Limited-Life line is for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eYou'll smell sulfur dioxide before you can see it — but by the time you're smelling it, you may already be at or above OSHA's exposure limit.\u003c\/strong\u003e SO2 has a pungent, unmistakable odor that most workers can detect between 0.5 and 3 ppm. OSHA's permissible exposure limit is 5 ppm as an 8-hour time-weighted average. The concentrations where you can smell SO2 and where you're already at the exposure limit overlap. Smell isn't a reliable measure of what you're breathing.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 2-Year SO2 gas detector is an alert-only monitor: no digital ppm display, factory-set alarm setpoints anchored to OSHA's PEL, non-serviceable, and no maintenance required. Activate it once, and it runs continuously for two years — no calibration, no battery replacement, no charging — alarming immediately when SO2 exceeds the factory-set thresholds. At $230, it's the shortest-commitment, lowest-cost SO2 monitor in the SST1 line — designed for jobs that finish inside two years.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTwo ways to run SO2 monitoring — pick the one that fits your job.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe SST1 SO2 line covers two tiers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-instrument, serviceable:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eWatchGas SST1-S serviceable SO2 monitor\u003c\/a\u003e — digital ppm readout, configurable low\/high\/TWA\/STEL alarms (defaults ship at 2 ppm \/ 5 ppm, aligned to the NIOSH REL), replaceable sensor cell at end-of-life. Higher upfront cost; lowest lifecycle cost for fleets in continuous multi-year service; the right choice if your exposure program is NIOSH-aligned or stricter than OSHA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlert-only, 2-year lifespan (this SKU):\u003c\/strong\u003e $230, factory-set alarms anchored to OSHA's PEL, non-serviceable, two-year operational life. Lowest upfront cost; ideal for shorter-duration commitments like refinery turnarounds, seasonal mill campaigns, mutual-aid emergency response, single-project contractor deployments, or training programs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFactory-set alarm thresholds, anchored to OSHA's permissible exposure limit for sulfur dioxide:\u003c\/strong\u003e Low 5 ppm matches OSHA's PEL of 5 ppm 8-hour TWA under 29 CFR 1910.1000 Table Z-1. High 10 ppm provides an acute warning at 2x the OSHA PEL — a signal to leave the area immediately rather than continue working through a low-alarm condition. Because the alarms are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field. If your facility runs against the stricter NIOSH REL (2 ppm TWA + 5 ppm STEL) or the ACGIH TLV-STEL (0.25 ppm), the full-instrument SST1-S is the right choice — its low\/high\/TWA\/STEL alarms are all configurable.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST1-S-24 for SO2 monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRefinery turnaround contractors on short-duration deployments — hydrotreating unit outages, sulfur recovery unit maintenance, sour crude handling projects\u003c\/li\u003e\n\u003cli\u003ePulp and paper mill contractors on Kraft-process campaigns or on-site sulfur recovery inspections\u003c\/li\u003e\n\u003cli\u003eMetal smelting contractors on short-term projects at copper, zinc, or lead smelting facilities\u003c\/li\u003e\n\u003cli\u003eSulfuric acid manufacturing plant maintenance contractors on turnarounds\u003c\/li\u003e\n\u003cli\u003eCoal-fired power plant contractors during boiler outages and stack maintenance\u003c\/li\u003e\n\u003cli\u003eMining and mineral processing contractors on sulfide ore roasting or smelting projects\u003c\/li\u003e\n\u003cli\u003eMutual-aid emergency response teams needing low-cost grab-and-go SO2 inventory for industrial fire response and chemical release response\u003c\/li\u003e\n\u003cli\u003eMunicipal hazmat teams needing occasional SO2 detection capability at industrial incident scenes\u003c\/li\u003e\n\u003cli\u003eVolcanology researchers and geothermal facility auditors on temporary assignments\u003c\/li\u003e\n\u003cli\u003eTraining programs using disposable monitors for teaching — shorter lifespan means faster inventory turn at lowest unit cost\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSO2 (2-year fixed life)\u003c\/td\u003e\n\u003ctd\u003e0 – 100 ppm\u003c\/td\u003e\n\u003ctd\u003e5 ppm \u003cem\u003e(OSHA PEL 8-hr TWA)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e10 ppm \u003cem\u003e(2x OSHA PEL — acute warning)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e The SST1 Limited-Life alert-only monitors don't require calibration during their fixed lifespan (the whole point of the design), but if you're mixing them with a fleet of the serviceable SST1 line — or with any other gas detectors — PK Safety supports the full WatchGas SST platform, plus BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your SO2 monitoring workflow with someone who understands both tiers of the SST1 SO2 line and can help you pick the right one for the job.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant lifecycle notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e One year shelf life (unactivated) then two years from activation date. Your operational clock starts the moment you turn the monitor on for the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce activated, the monitor cannot be shut down.\u003c\/strong\u003e It continues to run for its full two-year lifespan, and cannot be returned or shipped once activated (an alarm during transit is possible). Unactivated monitors can be returned normally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot resellable after activation.\u003c\/strong\u003e Buy for a specific worker or crew; the monitor stays with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe display shows MM and DD\u003c\/strong\u003e — months and days remaining before the monitor expires — not the current gas concentration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-DS-V1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-QSG-V1.7.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-2-3-YEAR-MAN-ENG-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-S-24 — SST1-S-24 SO2 0–100 ppm 2-year fixed life (sulfur dioxide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST1-S-24 alert-only monitor differ from the full-instrument SST1-S?\u003c\/summary\u003e\n\u003cp\u003eThe SST1 platform offers two tiers for SO2 monitoring, and this is the entry-price alert-only tier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisplay and configuration:\u003c\/strong\u003e the SST1-S-24 has no digital ppm display and no user-configurable alarm setpoints — it shows months and days remaining on its lifespan and alarms when SO2 exceeds its factory-set thresholds. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eWatchGas SST1-S serviceable SO2 monitor\u003c\/a\u003e shows continuous ppm readouts and offers configurable low\/high\/TWA\/STEL alarms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlarm alignment:\u003c\/strong\u003e the SST1-S-24 alarms at OSHA's PEL (5 ppm) and 2x the PEL (10 ppm) — factory-set. The SST1-S ships with default alarms at 2 ppm \/ 5 ppm (NIOSH REL-aligned), but every setpoint is configurable, so it can be tuned to OSHA, NIOSH, ACGIH, or a stricter internal program.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor lifecycle and price:\u003c\/strong\u003e the SST1-S-24 is non-serviceable, discarded at end-of-life after two years of continuous operation, and priced at $230 — the entry point in the SST1 SO2 line. The full-instrument SST1-S is serviceable — the sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eChoose the SST1-S-24 for shorter-commitment jobs (refinery turnarounds, seasonal mill campaigns, mutual-aid emergency inventory, training). Choose the SST1-S for continuous fleet service across multiple sensor generations, or when your exposure program requires alarm setpoints stricter than OSHA's PEL.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-S-24 ships with factory-set alarms of Low 5 ppm and High 10 ppm — aligned to OSHA's PEL, not the stricter NIOSH REL.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOSHA's PEL\u003c\/strong\u003e for sulfur dioxide under 29 CFR 1910.1000 Table Z-1 is 5 ppm as an 8-hour time-weighted average. The SST1-S-24's Low 5 ppm alarm matches OSHA's PEL exactly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNIOSH's REL\u003c\/strong\u003e is stricter: 2 ppm 8-hour TWA plus a 5 ppm short-term exposure limit (STEL) over any 15-minute period. The SST1-S-24 does NOT align to the NIOSH REL — its Low 5 ppm alarm sits at NIOSH's STEL rather than at NIOSH's TWA.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eACGIH's TLV-STEL\u003c\/strong\u003e is stricter still: 0.25 ppm. The SST1-S-24 does not align to the ACGIH standard.\u003c\/p\u003e\n\u003cp\u003eThe 10 ppm High alarm provides an acute warning at 2x the OSHA PEL — a signal to leave the area immediately rather than continue working through a low-alarm condition. Because the alarms are factory-set, there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field.\u003c\/p\u003e\n\u003cp\u003eIf your facility's internal exposure program requires stricter setpoints than OSHA's PEL — for example, NIOSH-aligned 2 ppm TWA + 5 ppm STEL, or ACGIH-aligned 0.25 ppm — the full-instrument \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eWatchGas SST1-S serviceable SO2 monitor\u003c\/a\u003e is the right choice; its low\/high\/TWA\/STEL alarms are all configurable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I detect SO2 by smell instead of using a monitor?\u003c\/summary\u003e\n\u003cp\u003eNot reliably. Sulfur dioxide has a pungent, sharp odor most workers can detect between 0.5 and 3 ppm — but that range overlaps with OSHA's exposure limit of 5 ppm. Individual odor detection thresholds vary widely, and chronic exposure can dull the sensation. Some workers smell SO2 well below the exposure limit; others don't notice it until they're already above it.\u003c\/p\u003e\n\u003cp\u003eAn alert-only monitor like the SST1-S-24 provides an alarm the moment SO2 crosses OSHA's PEL — no dependency on worker senses, no ambiguity about whether the concentration is compliant. For continuous ppm readouts (useful for building exposure audit logs), the full-instrument SST1-S is the right choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich industries typically use the SST1-S-24 for SO2 monitoring?\u003c\/summary\u003e\n\u003cp\u003eThe 2-year alert-only variant fits SO2-exposed workplaces where the monitoring need is shorter-term or the buyer wants the lowest-cost OSHA-compliance option:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePetroleum refining turnaround contractors — hydrotreating unit outages, sulfur recovery unit maintenance\u003c\/li\u003e\n\u003cli\u003ePulp and paper mill contractors on Kraft-process campaigns or on-site sulfur recovery inspections\u003c\/li\u003e\n\u003cli\u003eMetal smelting contractors on short-term projects (copper, zinc, lead smelters)\u003c\/li\u003e\n\u003cli\u003eSulfuric acid manufacturing plant maintenance contractors\u003c\/li\u003e\n\u003cli\u003eCoal-fired power plant contractors during boiler outages and stack work\u003c\/li\u003e\n\u003cli\u003eMining and mineral processing contractors on sulfide ore roasting projects\u003c\/li\u003e\n\u003cli\u003eMutual-aid emergency response teams needing low-cost SO2 inventory for industrial fire response\u003c\/li\u003e\n\u003cli\u003eMunicipal hazmat teams needing occasional SO2 detection capability\u003c\/li\u003e\n\u003cli\u003eVolcanology researchers and geothermal facility auditors on temporary assignments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor continuous, multi-year fleet monitoring at a facility with an ongoing SO2 exposure program — especially one running against the NIOSH REL or ACGIH TLV — the serviceable \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eSST1-S\u003c\/a\u003e is the better fit.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"2-year\" actually mean? When does the clock start?\u003c\/summary\u003e\n\u003cp\u003eThe lifecycle has two phases. Before activation, the monitor has a one-year shelf life (from manufacture date) during which it can sit unactivated in a warehouse or on a shelf without draining any capability. Once you press the activation button for the first time, the monitor runs continuously for two years — no user intervention required, no calibration, no battery replacement, no charging.\u003c\/p\u003e\n\u003cp\u003eThe display shows MM (months) and DD (days) remaining on the monitor's operational life so workers can see how much time is left. At the end of the two-year lifespan, the monitor stops functioning and gets discarded.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-S-24 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003ePartially. The SST1-S-24 can be bump-tested using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e — useful for verifying the monitor still alarms correctly at a given point in its two-year lifespan. However, it cannot be calibrated (the factory-set thresholds are permanent by design).\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e compliance kiosk can check in the SST1-S-24 and log its alarm-event history and remaining lifespan to fleet software — same as the full-instrument SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST1 SO2 tier fits your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the serviceable-vs-alert-only choice will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52202403791215,"sku":"WG01-SST1-S-24","price":230.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-SO2-24800x800compressed.jpg?v=1757014135"},{"product_id":"watchgas-sst1-3-year-h2s-gas-detector-sst1-h-36","title":"WatchGas SST1 3 Year H2S Gas Detector SST1-H-36","description":"\u003cp\u003e\u003cstrong\u003eNot every H2S monitor needs to give you a number. Sometimes the job just needs a badge that alarms when you're in danger — no calibration schedule, no battery replacement cycle, no training curve. That's what the SST1 Limited-Life line is for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 3-Year H2S gas detector is an alert-only monitor: no digital ppm display, factory-set alarm setpoints anchored to major U.S. regulatory ceiling limits, non-serviceable, and no maintenance required. Activate it once, and it runs continuously for three years — no calibration, no battery replacement, no charging — alarming immediately when it detects hydrogen sulfide above the factory-set thresholds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTwo ways to run H2S monitoring — pick the one that fits your job.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe SST1 line covers both:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-instrument, serviceable:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H serviceable H2S monitor\u003c\/a\u003e — digital ppm readout, configurable low\/high\/TWA\/STEL alarms, replaceable sensor cell at end-of-life, integration with the WatchGas SST platform. Higher upfront cost; lower lifecycle cost when the monitor stays in service for years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLimited-life, alert-only (this SKU):\u003c\/strong\u003e no display, factory-set alarms, no maintenance for three years, discarded at end-of-life. Lower upfront cost; simpler operation; ideal for jobs where a full instrument is over-spec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFactory-set alarm thresholds, anchored to U.S. regulatory exposure limits for hydrogen sulfide\u003c\/strong\u003e (H2S is regulated as a ceiling limit, not an 8-hour time-weighted average): Low 10 ppm matches the NIOSH REL Ceiling exactly (10 ppm, 10-minute maximum). High 15 ppm sits between NIOSH's 10 ppm ceiling and OSHA's 20 ppm ceiling under 29 CFR 1910.1000 Table Z-2 — a graduated alarm structure that triggers well before OSHA's regulatory limit. Because the alarms are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of accidentally reconfiguring a monitor away from a compliant threshold in the field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST1-H-36 for H2S monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContractors and subcontractors working oil \u0026amp; gas turnarounds, shutdowns, or one-off confined-space entries\u003c\/li\u003e\n\u003cli\u003eSmall crews at wastewater treatment plants and sewer operations — H2S is a common hazard from anaerobic decomposition\u003c\/li\u003e\n\u003cli\u003eMining and mineral processing crews entering confined space areas\u003c\/li\u003e\n\u003cli\u003ePulp and paper mill maintenance teams entering H2S-prone process areas\u003c\/li\u003e\n\u003cli\u003eFleet-supplemental backup monitors at facilities that primarily run a full-instrument SST1-H fleet\u003c\/li\u003e\n\u003cli\u003eEmergency response teams needing grab-and-go H2S inventory (fire departments, mutual-aid teams)\u003c\/li\u003e\n\u003cli\u003eTraining programs using disposable monitors for teaching without exposing training gear to calibration cycles\u003c\/li\u003e\n\u003cli\u003eConsultants and auditors on temporary deployment at client sites where H2S is a known hazard\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH2S (3-year fixed life)\u003c\/td\u003e\n\u003ctd\u003e0 – 500 ppm\u003c\/td\u003e\n\u003ctd\u003e10 ppm \u003cem\u003e(NIOSH REL Ceiling)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e15 ppm \u003cem\u003e(between NIOSH 10 \/ OSHA 20)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e The SST1 Limited-Life alert-only monitors don't require calibration during their fixed lifespan (the whole point of the design), but if you're mixing them with a fleet of the serviceable SST1 line — or with any other gas detectors — PK Safety supports the full WatchGas SST platform, plus BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S monitoring workflow with someone who understands both product tiers of the SST1 line.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant lifecycle notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e One year shelf life (unactivated) then three years from activation date. Your operational clock starts the moment you turn the monitor on for the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce activated, the monitor cannot be shut down.\u003c\/strong\u003e It continues to run for its full three-year life span, and cannot be returned or shipped once activated (an alarm during transit is possible). Unactivated monitors can be returned normally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot resellable after activation.\u003c\/strong\u003e Buy for a specific worker or crew; the monitor stays with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe display shows MM and DD\u003c\/strong\u003e — months and days remaining before the monitor expires — not the current gas concentration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-DS-V1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-QSG-V1.7.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-2-3-YEAR-MAN-ENG-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-H-36 — SST1-H-36 0–500 ppm 3-year fixed life (hydrogen sulfide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST1-H-36 alert-only monitor differ from the full-instrument SST1-H?\u003c\/summary\u003e\n\u003cp\u003eThe SST1 platform offers two tiers for H2S monitoring, and this is the alert-only tier. Two key differences:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisplay and configuration:\u003c\/strong\u003e the SST1-H-36 has no digital ppm display and no user-configurable alarm setpoints. It shows months and days remaining on its lifespan, and alarms when H2S exceeds its factory-set threshold. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H serviceable H2S monitor\u003c\/a\u003e shows continuous ppm readouts and offers configurable low\/high\/TWA\/STEL alarms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor lifecycle:\u003c\/strong\u003e the SST1-H-36 is non-serviceable — discarded at end-of-life after three years of continuous operation. The full-instrument SST1-H is serviceable — the sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eChoose the SST1-H-36 for jobs where simplicity matters more than data (contractor work, occasional entries, training, backup inventory). Choose the SST1-H for fleets that stay in continuous service across multiple years.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-H-36 ships with factory-set alarms of Low 10 ppm and High 15 ppm. Both are anchored to U.S. regulatory exposure thresholds for hydrogen sulfide, which is regulated as a ceiling limit (not an 8-hour time-weighted average):\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOSHA's ceiling\u003c\/strong\u003e under 29 CFR 1910.1000 Table Z-2 is 20 ppm — workers should never be exposed above 20 ppm at any instant. OSHA also permits a 50 ppm 10-minute peak once per shift, but only if no other measurable exposure occurs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNIOSH's REL\u003c\/strong\u003e is stricter at 10 ppm as a 10-minute ceiling (per the CDC\/NIOSH Pocket Guide).\u003c\/p\u003e\n\u003cp\u003eThe SST1-H-36's \u003cstrong\u003eLow 10 ppm\u003c\/strong\u003e alarm matches the NIOSH REL Ceiling exactly. The \u003cstrong\u003eHigh 15 ppm\u003c\/strong\u003e alarm sits between NIOSH's 10 ppm ceiling and OSHA's 20 ppm ceiling — a graduated alarm structure that triggers well before OSHA's regulatory limit. Because the setpoints are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field.\u003c\/p\u003e\n\u003cp\u003eIf your facility's internal exposure program requires different setpoints — for example, ACGIH's much stricter TLV-TWA of 1 ppm (2010 revision) — the full-instrument \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H serviceable H2S monitor\u003c\/a\u003e is the right choice; its low\/high\/TWA\/STEL alarms are all configurable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"3-year\" actually mean? When does the clock start?\u003c\/summary\u003e\n\u003cp\u003eThe lifecycle has two phases. Before activation, the monitor has a one-year shelf life (from manufacture date) during which it can sit unactivated in a warehouse or on a shelf without draining any capability. Once you press the activation button for the first time, the monitor runs continuously for three years — no user intervention required, no calibration, no battery replacement, no charging.\u003c\/p\u003e\n\u003cp\u003eThe display shows MM (months) and DD (days) remaining on the monitor's operational life so workers can see how much time is left. At the end of the three-year lifespan, the monitor stops functioning and gets discarded.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eOnce activated, can the monitor be shut down, returned, or shipped?\u003c\/summary\u003e\n\u003cp\u003eNo. Once activated, the SST1-H-36 cannot be turned off — it continues to run for its full three-year lifespan. This design intentionally prevents accidental shutdown of a live safety instrument, but it has three practical implications:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot shippable after activation:\u003c\/strong\u003e because the alarm may sound during transit, activated monitors cannot be shipped by common carriers. Ship unactivated units, activate on-site.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot returnable after activation:\u003c\/strong\u003e activated units are not eligible for return. Unactivated units can be returned normally within PK Safety's standard return window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot resellable after activation:\u003c\/strong\u003e assign each activated monitor to a specific worker or crew; it stays with them for its lifespan.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-H-36 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003ePartially. The SST1-H-36 can be bump-tested using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e — useful for verifying the monitor still alarms correctly at a given point in its three-year lifespan. However, it cannot be calibrated (the factory-set thresholds are permanent by design).\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e compliance kiosk can check in the SST1-H-36 and log its alarm-event history and remaining lifespan to fleet software — same as the full-instrument SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-H-36 after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line, including the Limited-Life alert-only tier. Since the SST1-H-36 doesn't require calibration or maintenance during its fixed three-year lifespan, post-sale support is primarily replacement (when a unit approaches end-of-life) and mixed-fleet coordination if you're running Limited-Life alongside full-instrument SST1 monitors or other brands.\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S monitoring workflow with someone who understands both product tiers of the SST1 line — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST1 tier fits your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the alert-only vs. full-instrument choice will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52202441408879,"sku":"WG01-SST1-H-36","price":168.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-H2S-36800x800compressed.jpg?v=1757075506"},{"product_id":"watchgas-sst1-3-year-co-gas-detector-sst1-m-36","title":"WatchGas SST1 3 Year CO Gas Detector SST1-M-36","description":"\u003cp\u003e\u003cstrong\u003eNot every CO monitor needs to give you a number. Sometimes the job just needs a badge that alarms when you're in danger — no calibration schedule, no battery replacement cycle, no training curve. That's what the SST1 Limited-Life line is for.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCarbon monoxide is odorless, colorless, and tasteless.\u003c\/strong\u003e Workers get zero sensory warning that CO is accumulating in an enclosed space — not until the physiological effects kick in (headache, dizziness, confusion), and by then the exposure is already past regulatory limits and can escalate quickly. For CO, the monitor isn't a backup to your senses. It IS the warning system.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 3-Year CO gas detector is an alert-only monitor: no digital ppm display, factory-set alarm setpoints anchored to the NIOSH REL for carbon monoxide, non-serviceable, and no maintenance required. Activate it once, and it runs continuously for three years — no calibration, no battery replacement, no charging — alarming immediately when it detects CO above the factory-set thresholds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTwo ways to run CO monitoring — pick the one that fits your job.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe SST1 line covers both:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-instrument, serviceable:\u003c\/strong\u003e the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M serviceable CO monitor\u003c\/a\u003e — digital ppm readout, configurable low\/high\/TWA\/STEL alarms, replaceable sensor cell at end-of-life, integration with the WatchGas SST platform. Higher upfront cost; lower lifecycle cost when the monitor stays in service for years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLimited-life, alert-only (this SKU):\u003c\/strong\u003e no display, factory-set alarms, no maintenance for three years, discarded at end-of-life. Lower upfront cost; simpler operation; ideal for jobs where a full instrument is over-spec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFactory-set alarm thresholds, anchored to U.S. regulatory exposure limits for carbon monoxide:\u003c\/strong\u003e Low 35 ppm matches the NIOSH REL TWA (35 ppm 8-hour). High 200 ppm matches the NIOSH REL Ceiling (200 ppm not to be exceeded at any moment). Both are stricter than OSHA's PEL of 50 ppm 8-hour TWA under 29 CFR 1910.1000 Table Z-1, which does not establish a separate ceiling for CO in general industry. Because the alarms are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of accidentally reconfiguring a monitor away from a compliant threshold in the field.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST1-M-36 for CO monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBoiler operators and industrial combustion equipment workers — CO is a natural byproduct of incomplete combustion\u003c\/li\u003e\n\u003cli\u003eVehicle emissions monitoring — garages, warehouses with propane forklifts, tunnels, parking structures\u003c\/li\u003e\n\u003cli\u003eFire departments and structural fire investigation crews — post-fire CO risk is real and persistent\u003c\/li\u003e\n\u003cli\u003eHVAC and plumbing technicians servicing gas appliances, furnaces, water heaters\u003c\/li\u003e\n\u003cli\u003eGrain drying and crop processing operators — CO accumulates in enclosed drying operations\u003c\/li\u003e\n\u003cli\u003eIndustrial furnace, kiln, and metallurgy workers\u003c\/li\u003e\n\u003cli\u003eWelding operations in enclosed spaces — indoor welding produces CO from consumables and preheat\u003c\/li\u003e\n\u003cli\u003eFleet-supplemental backup monitors at facilities that primarily run a full-instrument SST1-M fleet\u003c\/li\u003e\n\u003cli\u003eEmergency response teams needing grab-and-go CO inventory (fire departments, mutual-aid teams)\u003c\/li\u003e\n\u003cli\u003eTraining programs and consultants on temporary deployment at client sites\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (factory-set)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCO (3-year fixed life)\u003c\/td\u003e\n\u003ctd\u003e0 – 2000 ppm\u003c\/td\u003e\n\u003ctd\u003e35 ppm \u003cem\u003e(NIOSH REL TWA)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e200 ppm \u003cem\u003e(NIOSH REL Ceiling)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e The SST1 Limited-Life alert-only monitors don't require calibration during their fixed lifespan (the whole point of the design), but if you're mixing them with a fleet of the serviceable SST1 line — or with any other gas detectors — PK Safety supports the full WatchGas SST platform, plus BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO monitoring workflow with someone who understands both product tiers of the SST1 line.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant lifecycle notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e One year shelf life (unactivated) then three years from activation date. Your operational clock starts the moment you turn the monitor on for the first time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce activated, the monitor cannot be shut down.\u003c\/strong\u003e It continues to run for its full three-year life span, and cannot be returned or shipped once activated (an alarm during transit is possible). Unactivated monitors can be returned normally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot resellable after activation.\u003c\/strong\u003e Buy for a specific worker or crew; the monitor stays with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe display shows MM and DD\u003c\/strong\u003e — months and days remaining before the monitor expires — not the current gas concentration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-DS-V1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-QSG-V1.7.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST1-2-3-YEAR-MAN-ENG-v1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-M-36 — SST1-M-36 CO 0–2000 ppm 3-year fixed life (carbon monoxide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the SST1-M-36 alert-only monitor differ from the full-instrument SST1-M?\u003c\/summary\u003e\n\u003cp\u003eThe SST1 platform offers two tiers for CO monitoring, and this is the alert-only tier. Two key differences:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisplay and configuration:\u003c\/strong\u003e the SST1-M-36 has no digital ppm display and no user-configurable alarm setpoints. It shows months and days remaining on its lifespan, and alarms when CO exceeds its factory-set threshold. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M serviceable CO monitor\u003c\/a\u003e shows continuous ppm readouts and offers configurable low\/high\/TWA\/STEL alarms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSensor lifecycle:\u003c\/strong\u003e the SST1-M-36 is non-serviceable — discarded at end-of-life after three years of continuous operation. The full-instrument SST1-M is serviceable — the sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eChoose the SST1-M-36 for jobs where simplicity matters more than data (contractor work, occasional entries, training, backup inventory). Choose the SST1-M for fleets that stay in continuous service across multiple years.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-M-36 ships with factory-set alarms of Low 35 ppm and High 200 ppm. Both are anchored to the NIOSH Recommended Exposure Limit for carbon monoxide, which is stricter than the OSHA PEL for CO:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOSHA's PEL\u003c\/strong\u003e for carbon monoxide under 29 CFR 1910.1000 Table Z-1 is 50 ppm as an 8-hour time-weighted average. OSHA does not set a separate ceiling limit for CO in general industry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNIOSH's REL\u003c\/strong\u003e is stricter: 35 ppm 8-hour TWA plus a 200 ppm ceiling not to be exceeded at any moment.\u003c\/p\u003e\n\u003cp\u003eThe SST1-M-36's \u003cstrong\u003eLow 35 ppm\u003c\/strong\u003e alarm matches the NIOSH REL TWA exactly, and the \u003cstrong\u003eHigh 200 ppm\u003c\/strong\u003e alarm matches the NIOSH REL Ceiling exactly. Because the setpoints are factory-set (not user-configurable), you don't need to train workers on setpoint programming, and there's no risk of a monitor being accidentally reconfigured away from a compliant threshold in the field.\u003c\/p\u003e\n\u003cp\u003eIf your facility's internal exposure program requires stricter setpoints than NIOSH — for example, ACGIH's TLV-TWA of 25 ppm for CO — the full-instrument \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M serviceable CO monitor\u003c\/a\u003e is the right choice; its low\/high\/TWA\/STEL alarms are all configurable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is CO monitoring different from monitoring other gases?\u003c\/summary\u003e\n\u003cp\u003eCarbon monoxide is odorless, colorless, and tasteless. Unlike H2S (rotten-egg smell at low ppm), ammonia (pungent), or sulfur dioxide (sharp acid smell), CO gives workers zero sensory warning that concentrations are building up in an enclosed space. Symptoms of CO exposure — headache, dizziness, confusion, nausea — typically don't kick in until concentrations are already past regulatory limits, and CO poisoning can escalate quickly from mild symptoms to loss of consciousness.\u003c\/p\u003e\n\u003cp\u003eThat physiology has one operational implication for CO monitoring: the monitor isn't a backup or a confirmation of what workers can already sense. It IS the warning system. Whether you use a full-instrument SST1-M for continuous ppm readouts or an alert-only SST1-M-36 for factory-set threshold alarming, the monitor is the difference between recognizing a CO buildup in time and getting caught by it.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"3-year\" actually mean? When does the clock start?\u003c\/summary\u003e\n\u003cp\u003eThe lifecycle has two phases. Before activation, the monitor has a one-year shelf life (from manufacture date) during which it can sit unactivated in a warehouse or on a shelf without draining any capability. Once you press the activation button for the first time, the monitor runs continuously for three years — no user intervention required, no calibration, no battery replacement, no charging.\u003c\/p\u003e\n\u003cp\u003eThe display shows MM (months) and DD (days) remaining on the monitor's operational life so workers can see how much time is left. At the end of the three-year lifespan, the monitor stops functioning and gets discarded.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-M-36 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003ePartially. The SST1-M-36 can be bump-tested using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e — useful for verifying the monitor still alarms correctly at a given point in its three-year lifespan. However, it cannot be calibrated (the factory-set thresholds are permanent by design).\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e compliance kiosk can check in the SST1-M-36 and log its alarm-event history and remaining lifespan to fleet software — same as the full-instrument SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-M-36 after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line, including the Limited-Life alert-only tier. Since the SST1-M-36 doesn't require calibration or maintenance during its fixed three-year lifespan, post-sale support is primarily replacement (when a unit approaches end-of-life) and mixed-fleet coordination if you're running Limited-Life alongside full-instrument SST1 monitors or other brands.\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO monitoring workflow with someone who understands both product tiers of the SST1 line — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST1 tier fits your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the alert-only vs. full-instrument choice will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52202441474415,"sku":"WG01-SST1-M-36","price":210.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-CO-36-fixed-life800x800compressed.jpg?v=1757076465"},{"product_id":"watchgas-sst1-serviceable-ch4s-gas-detector-sst1-mm","title":"WatchGas SST1 Serviceable CH4S Gas Detector SST1-MM","description":"\u003cp\u003e\u003cstrong\u003eMethanethiol is the odorant added to natural gas so workers know when there's a leak. Which is exactly what makes ppm measurement of methyl mercaptan counterintuitive in the industrial settings that produce or handle it.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you work in gas odorization, kraft pulp and paper, wastewater treatment, landfill operations, or petrochemical refining, methyl mercaptan is the background smell of the job. Its odor detection threshold sits at roughly 1 ppb — more than 10,000 times below OSHA's 10 ppm ceiling limit and 500 times below NIOSH's REL ceiling of 0.5 ppm. That's a huge sensitivity margin, but it inverts into a problem: with no ppm reading, workers either become desensitized to the alarm system that smell is supposed to provide, or overreact to smells that are far below any exposure concern.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-MM Serviceable Methanethiol Gas Detector gives you a number instead of a nose.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIt reads methanethiol (CH4S, also known as methyl mercaptan or CH3SH) continuously in ppm across a 0–100 ppm range — spanning the regulatory range up to just below the NIOSH IDLH of 150 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA (10 ppm ceiling under 29 CFR 1910.1000 Table Z-1), NIOSH (0.5 ppm ceiling per the NIOSH Pocket Guide), ACGIH (0.5 ppm TLV-TWA), or a stricter internal exposure program. Default alarm setpoints ship at Low 2 ppm and High 5 ppm — configurable to match your facility's specific program.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy utility operators, pulp mill safety supervisors, and wastewater treatment managers pick the SST1 line for methanethiol monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous CH4S monitoring in ppm with configurable Low, High, TWA, and STEL alarms\u003c\/li\u003e\n\u003cli\u003eServiceable sensor — replace the methanethiol cell instead of the whole unit at end-of-life\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty (vs. the industry-typical 2 years); sensor warranty is 1 year, reflecting the specialty chemistry of methyl mercaptan sensors\u003c\/li\u003e\n\u003cli\u003e3-year replaceable battery based on typical alarm exposure\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology — compact, robust, temperature-tolerant\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App integration for datalogging\u003c\/li\u003e\n\u003cli\u003eVibration + audible + visual alarms — you notice it in a pulp mill's turpentine floor or a gas odorization facility\u003c\/li\u003e\n\u003cli\u003eBump test and calibration compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e; compliance check-in compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCH4S (methanethiol)\u003c\/td\u003e\n\u003ctd\u003e0 – 100 ppm\u003c\/td\u003e\n\u003ctd\u003e2 ppm\u003c\/td\u003e\n\u003ctd\u003e5 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the CH4S sensor drifts or needs replacement, send the unit to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your methanethiol monitoring setup with someone who understands the SST1 platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou work in natural gas or LPG odorization — utility operations, pipeline monitoring, propane distribution (methanethiol is the odorant added to natural gas)\u003c\/li\u003e\n\u003cli\u003eYou operate in kraft pulp and paper — the Kraft process produces methanethiol along with dimethyl sulfide and dimethyl disulfide (the \"total reduced sulfur\" or TRS group)\u003c\/li\u003e\n\u003cli\u003eYou supervise wastewater treatment, or any operation with anaerobic bacterial decomposition where CH4S is produced alongside H2S\u003c\/li\u003e\n\u003cli\u003eYou manage landfill operations, anaerobic digestion, or biogas production — methanethiol is a common biogas contaminant\u003c\/li\u003e\n\u003cli\u003eYou work in petrochemical refining or sulfur recovery — mercaptan removal and hydrotreating produce methanethiol byproducts\u003c\/li\u003e\n\u003cli\u003eYou run rendering, animal byproduct processing, or specialty chemical manufacturing where CH4S is a process gas\u003c\/li\u003e\n\u003cli\u003eYou need continuous methanethiol exposure logs for OSHA respiratory protection compliance, EPA odor management programs, or internal safety audits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-MM — SST1-MM Serviceable Methanethiol (CH4S \/ Methyl Mercaptan) Gas Detector, 0–100 ppm range, real-time display\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the OSHA exposure limit for methanethiol?\u003c\/summary\u003e\n\u003cp\u003eOSHA's permissible exposure limit (PEL) for methyl mercaptan (methanethiol) is 10 ppm as a ceiling limit under 29 CFR 1910.1000 Table Z-1 — meaning the concentration must never exceed 10 ppm at any moment during the workday, not an 8-hour average. NIOSH's recommended exposure limit (REL) is far more conservative: 0.5 ppm ceiling (per the NIOSH Pocket Guide). ACGIH sets a TLV-TWA of 0.5 ppm for an 8-hour workday.\u003c\/p\u003e\n\u003cp\u003eThe SST1-MM ships with default alarm setpoints of Low 2 ppm and High 5 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA, NIOSH, ACGIH, or a stricter internal program.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich industries typically require methanethiol monitoring?\u003c\/summary\u003e\n\u003cp\u003eMethanethiol monitoring is a compliance or best-practice requirement in several settings: natural gas and LPG odorization (utilities, pipelines, propane distribution — methanethiol is the odorant added to natural gas), kraft pulp and paper (Kraft process gases include methanethiol along with dimethyl sulfide and dimethyl disulfide — the \"total reduced sulfur\" or TRS group), wastewater treatment (bacterial decomposition produces methanethiol alongside H2S), landfill operations and anaerobic digestion (biogas), petrochemical refining and sulfur recovery (mercaptan removal, hydrotreating), and rendering \/ animal byproduct processing.\u003c\/p\u003e\n\u003cp\u003eAny workplace where methanethiol is produced or handled falls under OSHA's respiratory protection standard (29 CFR 1910.134). Facilities near populated areas may additionally have EPA odor management or ambient-air obligations under the Clean Air Act.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I detect methanethiol by smell instead of using a monitor?\u003c\/summary\u003e\n\u003cp\u003eNot reliably. Methanethiol has one of the lowest odor detection thresholds of any industrial gas — most workers can smell it below 1 ppb, which is roughly 10,000 times below OSHA's ceiling limit of 10 ppm and 500 times below NIOSH's REL ceiling of 0.5 ppm. That means workers in industries that produce or handle methyl mercaptan smell it constantly at concentrations far below any regulatory concern.\u003c\/p\u003e\n\u003cp\u003eThe paradox: with no ppm reading, workers either become desensitized to the smell (treating it as background) or overreact (treating every whiff as an emergency). Neither response tells you where you are on the exposure scale. A continuous ppm readout from the SST1-MM shows the actual concentration — background-level nuisance smell versus an actual approach to the OSHA ceiling limit — and produces the audit-ready exposure log that compliance programs and internal safety reviews need.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-MM?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas monitors are single-use — when the sensor reaches end-of-life, the whole unit gets replaced. The SST1 platform is designed to be serviced: the methanethiol sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eInstrument warranty is 3 years; sensor warranty is 1 year, which is shorter than the SST1's H2S or CO variants and reflects the specialty chemistry of methyl mercaptan sensors (mercaptan-selective sensor cells have shorter typical service lives than the more common sulfide or oxide detection chemistries). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-MM work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003eYes to both. The SST1-MM is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK compliance kiosk\u003c\/a\u003e for fleet-level compliance check-in, alarm history upload, and user\/location tracking.\u003c\/p\u003e\n\u003cp\u003eIf you're running a fleet of SST1 monitors across a gas utility, a pulp mill, or a wastewater plant, the SST-DOCK + SST-KIOSK combination covers your bump\/cal workflow and your compliance-tracking workflow together.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-MM after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-MM with factory-trained technicians in-house. That includes methanethiol sensor replacement when the cell reaches end-of-life, calibration, firmware updates, and warranty support (3-year instrument warranty, 1-year sensor warranty). Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your methanethiol monitoring setup with someone who knows the SST1 platform — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows methanethiol monitoring and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364397423,"sku":"WG01-SST1-MM","price":460.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-CH4S800x800compressed.jpg?v=1757100061"},{"product_id":"watchgas-sst1-serviceable-co-gas-detector-sst1-m","title":"WatchGas SST1 Serviceable CO ppm Gas Detector SST1-M","description":"\u003cp\u003e\u003cstrong\u003eCarbon monoxide has no smell, no color, and no immediate irritation. The first symptom is usually a mild headache — an hour or two after exposure that has already exceeded OSHA's 8-hour permissible limit.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWorkers around indoor combustion — propane forklifts in warehouse and distribution centers, boiler rooms, service garages, small equipment shops, indoor generators — breathe air that looks and smells completely normal while CO concentrations climb through the 8-hour PEL. There is no sensory warning system for CO. The nose can't help, the eyes can't help, and by the time the headache arrives, the cumulative dose is already at or above the regulatory limit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-M reads CO continuously in parts per million, across OSHA's 50 ppm 8-hour PEL and NIOSH's stricter 35 ppm TWA plus 200 ppm ceiling.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eConfigurable low, high, TWA, and STEL alarms catch both immediate spikes (a forklift running rich in a closed dock, a boiler with a cracked heat exchanger) and cumulative shift-length exposure (a service garage with baseline CO climbing across the workday). Vibration, audible, and visual alarms reach the worker before symptoms would. Single-button acknowledgment for gloves-on operation. Under 29 CFR 1910.134 respiratory protection programs and 29 CFR 1910.146 confined-space entry standards, continuous CO monitoring is either required or standard best practice in these environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy the freshness question matters on a CO monitor:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eCO sensors drift over time, and drift on a CO monitor doesn't announce itself. A sensor that has slowly lost 20% of its responsiveness will still show CO readings that look normal — but the alarm may not trigger at the concentration where it was set. In service garages, forklift operations, and boiler rooms where CO exposure is continuous, sensor drift is faster and the risk of quiet under-reading is higher.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 platform is designed to be serviced: the CO sensor cell is replaceable, the battery is replaceable, and PK Safety handles both in-house. When the sensor reaches end-of-life or drifts out of spec, send the unit in for a fresh sensor — the instrument stays in service, not scrapped and re-bought.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy safety managers standardize on the SST1-M:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous CO monitoring across 0–2000 ppm with configurable low, high, TWA, and STEL alarms\u003c\/li\u003e\n\u003cli\u003eServiceable sensor cell — replace at end-of-life instead of scrapping the whole monitor\u003c\/li\u003e\n\u003cli\u003eServiceable battery — 3-year replaceable\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty; 2-year sensor warranty\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology — more stable than legacy CO sensor designs\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App for phone-based setup\u003c\/li\u003e\n\u003cli\u003eVibration, audible, and visual alarms — you feel it in a running-machine environment\u003c\/li\u003e\n\u003cli\u003eCompatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e for automated bump test, calibration, and datalogged compliance workflow\u003c\/li\u003e\n\u003cli\u003eDatalogging for compliance audits — OSHA 29 CFR 1910.146 permit-required confined space, and internal exposure programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If the CO sensor drifts or reaches end-of-life, send the unit to us for replacement — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou run warehouse or distribution operations with propane forklifts (indoor combustion is the classic CO exposure environment — well documented in OSHA compliance directives)\u003c\/li\u003e\n\u003cli\u003eYou maintain boiler rooms, mechanical rooms, or utility rooms where natural gas or propane combustion equipment operates\u003c\/li\u003e\n\u003cli\u003eYou run a service garage, small engine shop, or auto body operation where vehicle exhaust accumulates indoors\u003c\/li\u003e\n\u003cli\u003eYou use indoor generators, air compressors, or other combustion-driven equipment in enclosed spaces\u003c\/li\u003e\n\u003cli\u003eYou do confined-space entry work in spaces adjacent to combustion sources (mechanical rooms, boiler penetrations, exhaust chases)\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready CO exposure logs for OSHA recordkeeping under 29 CFR 1910.146\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/02\/SST1A_CO_V70.upg\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Firmware Download\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eFirmware Download\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-M — CO 0–2000 ppm Serviceable, Real Time Display (Carbon Monoxide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the OSHA exposure limit for carbon monoxide?\u003c\/summary\u003e\n\u003cp\u003eOSHA's 8-hour permissible exposure limit (PEL) for carbon monoxide is 50 ppm as an 8-hour time-weighted average, under 29 CFR 1910.1000 Table Z-1. NIOSH's recommended exposure limit (REL) is stricter at 35 ppm 8-hour TWA plus a 200 ppm ceiling that must never be exceeded. At 1,200 ppm, the atmosphere is classified immediately dangerous to life and health (NIOSH IDLH).\u003c\/p\u003e\n\u003cp\u003eThe SST1-M has configurable alarm setpoints for low, high, TWA, and STEL — set to match your facility's exposure program (OSHA PEL, NIOSH REL, ACGIH TLV, or a stricter internal standard).\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is carbon monoxide especially dangerous compared to other toxic gases?\u003c\/summary\u003e\n\u003cp\u003eCO has no sensory warning system. It is colorless, odorless, tasteless, and does not irritate the eyes, nose, throat, or skin. There is nothing a worker's senses can detect until symptoms appear — and by then, the exposure has typically already exceeded regulatory limits. Compare to hydrogen sulfide (distinctive rotten-egg smell at low concentrations) or ammonia (pungent smell and eye\/throat irritation): those gases warn workers, even if imperfectly. CO does not.\u003c\/p\u003e\n\u003cp\u003eThe physiological mechanism also matters. CO binds to hemoglobin at 200–250 times the affinity of oxygen, forming carboxyhemoglobin that blocks oxygen transport in the bloodstream. Symptoms progress from mild headache and fatigue at 15–25% carboxyhemoglobin to unconsciousness at 40–50% and death above 50%. Once CO has bound to hemoglobin, only fresh air or supplemental oxygen therapy will displace it — the effect is cumulative across a shift.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-M?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas CO monitors are single-use — when the sensor reaches end-of-life (typically 2 years), the whole unit gets scrapped and replaced. The SST1 platform is designed to be serviced: the CO sensor cell is replaceable, and the battery is also replaceable (3-year rating). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor or battery needs replacement.\u003c\/p\u003e\n\u003cp\u003eThe freshness argument matters on a CO monitor because CO sensors drift, and drift on a CO monitor is silent. A sensor that has lost 20% responsiveness will still show CO readings that look normal — but the alarm may not fire at the concentration where it was set. Replacing the sensor cell restores full responsiveness without buying a new instrument.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often should I bump test and calibrate the SST1-M?\u003c\/summary\u003e\n\u003cp\u003eBump test before every use — a quick check with a known CO concentration that confirms the sensor responds and the alarm fires. Calibration is a longer procedure that adjusts sensor readings against a certified gas concentration standard. Manufacturer recommendation for the SST1 platform is calibration every six months at minimum.\u003c\/p\u003e\n\u003cp\u003eOperations with continuous CO exposure (forklift-operated warehouses, service garages, boiler rooms) often calibrate more frequently — quarterly, or after any alarm event — because CO sensors drift faster in environments with baseline gas presence. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-M work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST1-M is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. If you're running a fleet of SST1 monitors (SST1-M for CO, SST1-H for H2S, SST1-O for O2, and other gas variants), the SST-DOCK handles them all interchangeably.\u003c\/p\u003e\n\u003cp\u003eThe bump test plus calibration workflow takes about 60 seconds per unit — fast enough to run a fleet through end-of-shift without slowing crew turnover.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-M after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-M with factory-trained technicians in-house. That covers sensor replacement, battery replacement, calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform — not a call-center script.\u003c\/p\u003e\n\u003cp\u003ePK Safety also handles BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof, so a mixed-brand fleet doesn't mean shipping to multiple service centers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure the SST1-M is the right monitor for your CO exposure program? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows indoor-combustion work and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364364655,"sku":"WG01-SST1-M","price":210.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-CO800x800compressed.jpg?v=1757094549"},{"product_id":"watchgas-sst1-serviceable-h2-gas-detector-sst1-h2","title":"WatchGas SST1 Serviceable H2 Gas Detector SST1-H2","description":"\u003cp\u003e\u003cstrong\u003eHydrogen has no smell, no color, and no toxic exposure limit. Which is exactly why workers in battery rooms, hydrogen refueling stations, fuel cell manufacturing, and refinery hydrotreating rely entirely on continuous monitoring — there's no sensory backup, and no OSHA PEL to signal \"over exposure.\"\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eHydrogen isn't like the other gases you monitor. It doesn't have a toxicity story: OSHA has no permissible exposure limit for H2, and there's no smell or color to tell you a leak is present. What hydrogen does have is a wide flammability range (4% to 74% by volume in air) and an extremely low ignition energy — static electricity or a hot surface can be enough. Add to that the fact that H2 is the smallest molecule in existence: it diffuses through joints, gaskets, and small cracks faster than any other gas, and it rises quickly, accumulating near ceilings and in enclosed roof spaces.\u003c\/p\u003e\n\n\u003cp\u003eWithout a continuous instrument, there's no way to know a leak is present until it either ignites or displaces enough oxygen to cause asphyxiation. The monitor is the safety system.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-H2 Serviceable Hydrogen Gas Detector gives you a number instead of a nose — in an environment where the nose can't help.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIt reads hydrogen continuously in ppm across a 0–1000 ppm range — the \"H2 Low Range\" configuration designed for early leak detection well below the flammability limit. Hydrogen's LEL (lower explosive limit) is 4%, which is 40,000 ppm. The SST1-H2's default alarms of Low 100 ppm and High 400 ppm sit at 0.25% and 1% of LEL respectively — deep in the safe zone, giving your team time to investigate, ventilate, and shut down before a leak approaches any flammability concern. Configurable low, high, TWA, and STEL alarms let you tune the monitor to your facility's specific safety program.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy battery-room operators, fuel cell manufacturers, and refinery safety engineers pick the SST1 line for hydrogen monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous H2 monitoring in ppm with configurable Low, High, TWA, and STEL alarms\u003c\/li\u003e\n\u003cli\u003e0–1000 ppm early-warning range — designed for detecting leaks well below the 4% LEL, not for high-concentration monitoring\u003c\/li\u003e\n\u003cli\u003eServiceable sensor — replace the H2 sensor cell instead of the whole unit at end-of-life\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty (vs. the industry-typical 2 years); 2-year sensor warranty (H2 sensor chemistry is more stable than mercaptan or phosphine sensors, so the sensor lasts longer)\u003c\/li\u003e\n\u003cli\u003e3-year replaceable battery based on typical alarm exposure\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology — compact, robust, temperature-tolerant\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App integration for datalogging\u003c\/li\u003e\n\u003cli\u003eVibration + audible + visual alarms — you notice it in a battery room or a refinery process area\u003c\/li\u003e\n\u003cli\u003eBump test and calibration compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e; compliance check-in compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH2 (Low Range)\u003c\/td\u003e\n\u003ctd\u003e0 – 1000 ppm\u003c\/td\u003e\n\u003ctd\u003e100 ppm \u003cem\u003e(0.25% of LEL)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e400 ppm \u003cem\u003e(1% of LEL)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the H2 sensor drifts or needs replacement, send the unit to us. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your hydrogen monitoring workflow — battery room, refueling station, fuel cell facility, or refinery — with someone who understands the SST1 platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou manage a battery room — lead-acid charging areas produce H2 gas during recharge cycles (many state and local electrical codes require continuous H2 monitoring); Li-ion outgassing in thermal runaway conditions also includes H2\u003c\/li\u003e\n\u003cli\u003eYou operate a hydrogen refueling station or run a fleet of H2 fuel cell vehicles\u003c\/li\u003e\n\u003cli\u003eYou work in fuel cell manufacturing — transportation, stationary power, or backup power applications\u003c\/li\u003e\n\u003cli\u003eYou supervise petroleum refining operations — hydrotreating units, hydrocracking, hydrogen recovery, sulfur recovery\u003c\/li\u003e\n\u003cli\u003eYou run ammonia synthesis (Haber-Bosch), methanol production, or chemical hydrogenation processes\u003c\/li\u003e\n\u003cli\u003eYou work in semiconductor manufacturing where H2 is used as a reducing atmosphere for CVD, epitaxial growth, or wafer processing\u003c\/li\u003e\n\u003cli\u003eYou handle aerospace propellants or rocket-fuel operations\u003c\/li\u003e\n\u003cli\u003eYou're building out green hydrogen electrolysis, storage, or transport infrastructure\u003c\/li\u003e\n\u003cli\u003eYou need continuous hydrogen leak-detection logs for OSHA respiratory protection, flammable gas atmosphere compliance (29 CFR 1910.106), NFPA 2 (Hydrogen Technologies Code), or internal safety audits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-H2 — SST1-H2 Serviceable Hydrogen (H2) Gas Detector, 0–1000 ppm range, real-time display\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes OSHA have an exposure limit for hydrogen?\u003c\/summary\u003e\n\u003cp\u003eNo. OSHA does not set a permissible exposure limit (PEL) for hydrogen, because H2 is classified as a simple asphyxiant (it displaces oxygen at high concentrations) and a flammability hazard — not a toxicity hazard in the same sense as H2S, CO, SO2, or other regulated gases.\u003c\/p\u003e\n\u003cp\u003eThat makes the monitoring story different from other single-gas monitors: the alarm setpoint isn't \"you're over the toxic exposure limit\" — it's \"there's a leak accumulating toward the flammability lower limit.\" Hydrogen's LEL is 4% (40,000 ppm). The SST1-H2's default Low 100 ppm alarm sits at 0.25% of LEL, and the High 400 ppm alarm sits at 1% of LEL — both are conservative early warnings well before any flammability concern. Configurable setpoints let you tune to your facility's specific safety program (which may reference NFPA 2, OSHA 1910.106, local electrical codes, or an internal standard).\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhere is hydrogen monitoring typically required?\u003c\/summary\u003e\n\u003cp\u003eHydrogen monitoring is a compliance or best-practice requirement across a growing set of environments: battery rooms (lead-acid charging produces H2 during recharge cycles — required by many state and local electrical codes; Li-ion thermal runaway also releases H2), hydrogen refueling stations and H2 fuel cell vehicle operations, fuel cell manufacturing (transportation, stationary, backup power), petroleum refining (hydrotreating, hydrocracking, hydrogen recovery units, sulfur recovery), ammonia synthesis via Haber-Bosch, methanol production and chemical hydrogenation, semiconductor manufacturing (H2 as reducing atmosphere), aerospace and rocket propellant handling, and emerging green hydrogen production via electrolysis.\u003c\/p\u003e\n\u003cp\u003eCommon regulatory references: 29 CFR 1910.146 (confined space), 29 CFR 1910.106 (flammable liquid handling), NFPA 2 Hydrogen Technologies Code, IFC and IBC hydrogen-specific chapters, and local electrical codes for battery rooms.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy can't I detect hydrogen by smell?\u003c\/summary\u003e\n\u003cp\u003eHydrogen is completely undetectable by human senses — no smell, no color, no taste. Unlike natural gas (which has methanethiol added as an odorant), industrial hydrogen typically has no odorant. Some hydrogen produced from certain feedstocks may have trace impurities that impart a faint odor, but this is unreliable and impurity-dependent.\u003c\/p\u003e\n\u003cp\u003eHydrogen also diffuses very rapidly — it's the smallest molecule in existence, and it moves through joints, gaskets, and small cracks faster than any other gas. It rises quickly in still air and tends to accumulate near ceilings and in enclosed overhead spaces. Without a continuous instrument, there's no reliable way to know a leak is present until it either ignites or displaces enough oxygen to cause asphyxiation. The monitor is the safety system.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the SST1-H2's measuring range designed for?\u003c\/summary\u003e\n\u003cp\u003eThe SST1-H2 measures hydrogen in the 0–1000 ppm range — what WatchGas designates the \"H2 Low Range\" configuration. That range is designed for \u003cstrong\u003eearly leak detection well below the flammability limit\u003c\/strong\u003e. Hydrogen's LEL is 4% (40,000 ppm), so the SST1-H2's Low alarm at 100 ppm sits at 0.25% of LEL, and the High alarm at 400 ppm sits at 1% of LEL. Both are conservative early-warning setpoints, well before any accumulation approaches flammability.\u003c\/p\u003e\n\u003cp\u003eThis makes the SST1-H2 suitable for battery rooms, fuel cell facilities, refinery process areas, and any environment where the safety objective is preventing accumulation of an H2 leak. It is NOT designed for detecting high-concentration hydrogen atmospheres (which would require a %LEL-range monitor and typically SCBA-equipped entry procedures).\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-H2?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas monitors are single-use — when the sensor reaches end-of-life, the whole unit gets replaced. The SST1 platform is designed to be serviced: the hydrogen sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan. Instrument warranty is 3 years; sensor warranty is 2 years (H2 sensor chemistry is more stable than mercaptan or phosphine sensors, so the sensor lasts longer between replacements). PK Safety services the WatchGas SST line in-house.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-H2 work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003eYes to both. The SST1-H2 is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK compliance kiosk\u003c\/a\u003e for fleet-level compliance check-in.\u003c\/p\u003e\n\u003cp\u003eIf you're running a fleet of SST1-H2 monitors across a battery-room network, a hydrogen refueling operation, or a refinery hydrogen system, the SST-DOCK + SST-KIOSK combination covers your bump\/cal workflow and your compliance-tracking workflow together.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit for your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows hydrogen monitoring and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364299119,"sku":"WG01-SST1-H2","price":420.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-H2800x800compressed.jpg?v=1757099713"},{"product_id":"watchgas-sst1-serviceable-h2s-gas-detector-sst1-h","title":"WatchGas SST1 Serviceable H2S Gas Detector SST1-H","description":"\u003cp\u003e\u003cstrong\u003eHydrogen sulfide is what makes gas detection non-optional. Rotten-egg smell at 1 ppm. Olfactory paralysis at 100 ppm — right where the atmosphere is classified immediately dangerous to life and health.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIn sour service, wastewater treatment, pulp mills, confined livestock operations, and landfill work, workers cannot rely on their sense of smell to keep them alive. H2S has the exact wrong safety profile: obvious at concentrations that can't hurt anyone, undetectable to the nose at concentrations that can cause unconsciousness within one breath.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-H reads H2S continuously in parts per million, from below OSHA's 20 ppm ceiling through the IDLH threshold at 100 ppm and above.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eConfigurable low, high, TWA, and STEL alarms fire well below regulatory limits — with vibration, audible, and visual signals that reach a worker even when their nose no longer can. Single-button operation means the alarm can be acknowledged with gloves on. Under 29 CFR 1910.146 permit-required confined-space entries and 29 CFR 1910.134 respiratory protection programs, continuous H2S monitoring is either explicitly required or standard best practice.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy the freshness question matters more on H2S than on any other single-gas instrument:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eH2S sensors have a definite service life — typically 2 years — after which responsiveness slowly falls. A drift-affected sensor still shows readings, but those readings may not trigger the alarm at the concentration where the alarm was set. Fleet-safety programs that assume a 3-year-old H2S monitor is still calibrated to spec are one bad bump-test cycle away from missing an alarm in the field.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 platform is designed to be serviced: the H2S sensor cell is replaceable, the battery is replaceable, and PK Safety handles both in-house. When the sensor reaches end-of-life, send the unit in for a fresh sensor — the instrument stays in service, not scrapped and re-bought.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy safety managers standardize on the SST1-H:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous H2S monitoring across the 0–500 ppm range with configurable low, high, TWA, and STEL alarms\u003c\/li\u003e\n\u003cli\u003eServiceable sensor cell — replace at end-of-life instead of scrapping the whole monitor\u003c\/li\u003e\n\u003cli\u003eServiceable battery — 3-year replaceable\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty; 2-year sensor warranty\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology — more stable than legacy H2S sensor designs\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App for phone-based setup\u003c\/li\u003e\n\u003cli\u003eVibration, audible, and visual alarms — you notice it in a noisy pump station or drilling floor\u003c\/li\u003e\n\u003cli\u003eCompatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e for automated bump test, calibration, and datalogged compliance workflow\u003c\/li\u003e\n\u003cli\u003eDatalogging for compliance audits — OSHA 29 CFR 1910.146 permit-required confined space, and internal exposure programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If the H2S sensor drifts or reaches end-of-life, send the unit to us for replacement — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S monitoring setup with someone who understands sour-service work and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou work sour-service oil \u0026amp; gas (upstream production streams with dissolved H2S, downstream refining with residual H2S in process gas)\u003c\/li\u003e\n\u003cli\u003eYou're in wastewater treatment (H2S from anaerobic decomposition — 20+ ppm at grit chambers, wet wells, and headworks is common)\u003c\/li\u003e\n\u003cli\u003eYou work in pulp and paper (kraft process H2S emissions in digester, recovery boiler, and pulp storage areas)\u003c\/li\u003e\n\u003cli\u003eYou do confined livestock operations (poultry barns, manure pits — seasonal H2S peaks during agitation)\u003c\/li\u003e\n\u003cli\u003eYou work landfill operations (H2S from anaerobic decomposition of organic waste)\u003c\/li\u003e\n\u003cli\u003eYou do site maintenance, turnaround, or shutdown work in refineries or chemical plants where residual H2S may remain after lock-out\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready H2S exposure logs for OSHA recordkeeping under 29 CFR 1910.146\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/02\/SST1A_H2S_V70.upg\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Firmware Download\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eFirmware Download\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e \u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-H — H2S 0–500 ppm Serviceable, Real Time Display (Hydrogen Sulfide)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the OSHA exposure limit for hydrogen sulfide?\u003c\/summary\u003e\n\u003cp\u003eOSHA sets a 20 ppm ceiling for hydrogen sulfide under 29 CFR 1910.1000 Table Z-2 — meaning workers should never be exposed above 20 ppm at any instant. This is a CEILING limit, not an 8-hour time-weighted average, which is different from most toxic-gas standards. Table Z-2 also permits a single acceptable maximum peak concentration of 50 ppm for up to 10 minutes if no other measurable exposure occurs, but the 20 ppm ceiling is the operational number for most exposure programs.\u003c\/p\u003e\n\u003cp\u003eNIOSH's recommended exposure limit is stricter at 10 ppm as a 10-minute ceiling. At 100 ppm, the atmosphere is classified immediately dangerous to life and health (NIOSH IDLH). The SST1-H's configurable alarms can be tuned to the OSHA ceiling, the NIOSH REL, or a stricter internal standard.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is olfactory paralysis a specific concern with H2S?\u003c\/summary\u003e\n\u003cp\u003eHydrogen sulfide has a very distinctive rotten-egg smell at low concentrations — most workers can detect it easily at 0.13 ppm, well below any exposure limit. The problem is that at concentrations at or above 100 ppm — coincident with the NIOSH IDLH threshold — the olfactory nerves become paralyzed within seconds. Workers stop smelling the gas exactly when it reaches lethal concentrations.\u003c\/p\u003e\n\u003cp\u003eThis physiological quirk is why H2S monitoring is not optional in sour-service environments. Relying on the sense of smell would misinform workers at the most dangerous concentrations. A continuous reading in ppm from the SST1-H shows the actual concentration regardless of nose adaptation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-H?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas H2S monitors are single-use — when the sensor reaches end-of-life (typically 2 years), the whole unit gets scrapped and replaced. The SST1 platform is designed to be serviced: the H2S sensor cell is replaceable, and the battery is also replaceable (3-year rating). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor or battery needs replacement.\u003c\/p\u003e\n\u003cp\u003eThe freshness argument is especially important on H2S monitors because a drift-affected sensor still displays readings, but those readings may not trigger the alarm at the concentration where the alarm was set. Replacing the sensor cell restores full responsiveness without buying a new instrument.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often should I bump test and calibrate the SST1-H?\u003c\/summary\u003e\n\u003cp\u003eBump test before every use — a quick check with a known H2S concentration that confirms the sensor responds and the alarm fires. Calibration is a longer procedure that adjusts sensor readings against a certified gas concentration standard. Manufacturer recommendation for the SST1 platform is calibration every six months at minimum.\u003c\/p\u003e\n\u003cp\u003eSour-service and wastewater operators frequently calibrate more often — quarterly, or after any alarm event — because H2S sensors drift faster in environments with continuous H2S exposure. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect under 29 CFR 1910.146 recordkeeping requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-H work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST1-H is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. If you're running a fleet of SST1 monitors (SST1-H for H2S, SST1-M for CO, SST1-O for O2, and other gas variants), the SST-DOCK handles them all interchangeably and generates timestamped logs suitable for OSHA audits.\u003c\/p\u003e\n\u003cp\u003eThe bump test plus calibration workflow takes about 60 seconds per unit — fast enough to run a fleet through end-of-shift without slowing crew turnover.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-H after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-H with factory-trained technicians in-house. That covers sensor replacement, battery replacement, calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S monitoring setup with someone who understands sour-service and confined-space work and the WatchGas SST platform — not a call-center script.\u003c\/p\u003e\n\u003cp\u003ePK Safety also handles BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof, so a mixed-brand fleet doesn't mean shipping to multiple service centers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure the SST1-H is the right monitor for your H2S exposure program? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows sour-service work and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364266351,"sku":"WG01-SST1-H","price":210.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-H2S800x800comrpessed.jpg?v=1757092740"},{"product_id":"watchgas-sst1-serviceable-nh3-gas-detector-sst1-a","title":"WatchGas SST1 Serviceable NH3 Gas Detector SST1-A","description":"\u003cp\u003e\u003cstrong\u003eAmmonia is pungent enough to smell at 5 ppm — and by the time you can't smell it anymore, you're above OSHA's exposure limit.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAnyone who works around ammonia — refrigeration compressor rooms, poultry houses, fertilizer operations, industrial cleaning, chemical facilities — knows the paradox: at low concentrations it's obvious, and at dangerous concentrations olfactory fatigue kicks in fast. Workers stop noticing what they're breathing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-A Serviceable NH3 Gas Detector gives you a number instead of a nose.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIt reads ammonia continuously in ppm — across OSHA's 8-hour PEL of 50 ppm and NIOSH's stricter 25 ppm REL — with configurable low, high, TWA, and STEL alarms. When ammonia hits the alarm threshold, the SST1-A vibrates, buzzes, and flashes. Single-button operation means a worker in gloves and PPE can silence, snooze, or acknowledge without taking gear off.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy refrigeration safety managers, poultry producers, and chemical facility operators pick the SST1 line:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous NH3 monitoring with configurable alarm setpoints for low, high, TWA, and STEL\u003c\/li\u003e\n\u003cli\u003eServiceable sensor — replace the NH3 cell instead of the whole unit at end-of-life\u003c\/li\u003e\n\u003cli\u003e3-year warranty (vs. the industry-typical 2 years) on the SST1 platform\u003c\/li\u003e\n\u003cli\u003eVibration + audible + visual alarms — you notice it in a compressor room\u003c\/li\u003e\n\u003cli\u003eBump test and calibration compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e for fleet management\u003c\/li\u003e\n\u003cli\u003eDatalogging for compliance audits — IIAR, OSHA PSM (29 CFR 1910.119), and internal safety programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If the NH3 sensor drifts or needs replacement, send the unit to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through the SST1 setup with someone who actually understands ammonia detection and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou work around refrigeration ammonia (cold storage, food processing, grocery distribution centers)\u003c\/li\u003e\n\u003cli\u003eYou're in ammonia-intensive agriculture (poultry, dairy, anhydrous fertilizer distribution)\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready NH3 exposure logs for IIAR or OSHA PSM compliance\u003c\/li\u003e\n\u003cli\u003eYou've had a worker report headaches, or eye\/throat irritation, and want to quantify what they're breathing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST1-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2023\/04\/MKT-SST1-DS-V1.0-19.04.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/09\/MKT-SST1-QSG-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e \u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-A — SST1-A Serviceable NH3 (Ammonia) Gas Detector\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the OSHA exposure limit for ammonia?\u003c\/summary\u003e\n\u003cp\u003eOSHA's permissible exposure limit (PEL) for ammonia is 50 ppm as an 8-hour time-weighted average, under 29 CFR 1910.1000 Table Z-1. NIOSH's recommended exposure limit (REL) is more conservative at 25 ppm TWA plus a 35 ppm short-term exposure limit (STEL) over any 15-minute period. Many facilities set internal exposure targets to the NIOSH level rather than the OSHA PEL.\u003c\/p\u003e\n\u003cp\u003eThe SST1-A has configurable alarm setpoints for low, high, TWA, and STEL — set to match your facility's exposure program (OSHA, NIOSH, ACGIH, or a stricter internal standard).\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhere is ammonia detection required or recommended?\u003c\/summary\u003e\n\u003cp\u003eAmmonia detection is a compliance or best-practice requirement in several settings: industrial refrigeration systems containing more than 10,000 pounds of ammonia (OSHA's Process Safety Management standard, 29 CFR 1910.119); refrigeration systems covered by the IIAR (International Institute of Ammonia Refrigeration) standards; agricultural operations handling anhydrous ammonia; and any workplace where ammonia is used or stored that falls under OSHA's respiratory protection standard (29 CFR 1910.134).\u003c\/p\u003e\n\u003cp\u003eCommon industries that rely on the SST1-A: cold storage and food processing (refrigeration compressor rooms), poultry and dairy farming (ambient NH3 in barns), fertilizer distribution and application (anhydrous ammonia), industrial cleaning, and chemical manufacturing.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy can't I just rely on smell to detect ammonia?\u003c\/summary\u003e\n\u003cp\u003eAmmonia has a very distinctive pungent smell at low concentrations — most people can detect NH3 easily at 5 ppm. But at higher concentrations, olfactory fatigue sets in fast: the sensory nerves become desensitized within minutes, and workers can no longer reliably tell whether concentrations are rising or falling. Olfactory fatigue is well-documented for NH3 and is a major reason continuous instrument monitoring is required in ammonia-intensive facilities.\u003c\/p\u003e\n\u003cp\u003eA continuous readout in ppm from the SST1-A shows the actual concentration regardless of nose adaptation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-A?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas monitors are single-use — when the sensor reaches end-of-life (typically 2–3 years), the whole unit gets replaced. The SST1 platform is designed to be serviced: the NH3 sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan. PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-A work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST1-A is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. If you're running a fleet of SST1 monitors, the SST-DOCK automates the compliance workflow — bump test plus calibration in about 60 seconds per unit, with automatic timestamped logs suitable for IIAR and OSHA PSM audits.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-A after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-A with factory-trained technicians in-house. That includes sensor replacement, calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your NH3 monitoring setup with someone who knows the SST1 platform — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows ammonia monitoring and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364233583,"sku":"WG01-SST1-A","price":420.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-NH3800x800compressed.jpg?v=1757098288"},{"product_id":"watchgas-sst1-serviceable-o2-gas-detector-sst1-o","title":"WatchGas SST1 Serviceable O2 Gas Detector SST1-O","description":"\u003cp\u003e\u003cstrong\u003eOxygen deficiency is silent. The gases that displace oxygen — nitrogen, argon, helium, carbon dioxide, methane — are almost all colorless and odorless at the concentrations that matter.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA worker in a nitrogen-purged tank, a CO2-flooded fermentation cellar, a cryogenic storage room, or a semiconductor process bay can lose consciousness in minutes with no sensory warning. The atmosphere feels normal until cognitive impairment sets in — and at that point, workers often lose the ability to accurately judge their own condition.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-O reads oxygen concentration continuously by percent-by-volume, with configurable alarms at OSHA's 19.5% oxygen-deficient classification and the 23.5% oxygen-enriched threshold.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUnder 29 CFR 1910.146 (permit-required confined space) and 29 CFR 1910.134 (respiratory protection), atmospheres below 19.5% O2 are classified oxygen-deficient and atmospheres above 23.5% are classified oxygen-enriched (fire\/combustion hazard). Configurable low, high, TWA, and STEL alarms can be tuned to OSHA compliance levels or a stricter internal standard. Vibration, audible, and visual alarms reach workers before cognitive impairment does. Single-button acknowledgment for gloves-on operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy the freshness question matters on an O2 monitor:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eOxygen sensors have finite service life — typically 1 to 2 years, often shorter than CO or H2S sensors on the same platform. As the sensor ages, response slows and readings drift; a sensor that has lost 10–15% responsiveness may still show a normal-looking oxygen level while missing an actual deficiency onset. In operations where atmospheric oxygen displacement is routine (breweries, cryogenics, semiconductor fabs, food-packaging with inert flush), sensor drift is more consequential than in typical industrial monitoring.\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST1 platform is designed to be serviced: the O2 sensor cell is replaceable, the battery is replaceable, and PK Safety handles both in-house. When the sensor reaches end-of-life, send the unit in for a fresh sensor — the instrument stays in service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy safety managers standardize on the SST1-O:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous O2 monitoring across 0–25% by volume with configurable low, high, TWA, and STEL alarms\u003c\/li\u003e\n\u003cli\u003eAlarm setpoints at OSHA thresholds: 19.5% oxygen-deficient classification, 23.5% oxygen-enriched classification (per 29 CFR 1910.146)\u003c\/li\u003e\n\u003cli\u003eServiceable sensor cell — replace at end-of-life instead of scrapping the whole monitor\u003c\/li\u003e\n\u003cli\u003eServiceable battery — 2-year rated\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty; 2-year sensor warranty\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App for phone-based setup\u003c\/li\u003e\n\u003cli\u003eVibration, audible, and visual alarms — you notice it in a running-machine environment or a quiet fermentation cellar\u003c\/li\u003e\n\u003cli\u003eCompatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e for automated bump test, calibration, and datalogged compliance workflow\u003c\/li\u003e\n\u003cli\u003eDatalogging for compliance audits under 29 CFR 1910.146 recordkeeping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors — one shop for a mixed fleet. If the O2 sensor drifts or reaches end-of-life, send the unit to us for replacement — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your oxygen-deficiency monitoring setup with someone who understands the operational patterns and the WatchGas SST platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou do permit-required confined-space entries into tanks, vaults, or vessels that may have been purged with inert gas\u003c\/li\u003e\n\u003cli\u003eYou run food or beverage inert-packaging operations (nitrogen or CO2 flush on packaging lines, MAP packaging)\u003c\/li\u003e\n\u003cli\u003eYou operate a brewery, winery, or cidery (fermentation CO2 accumulates in cellars, walk-in coolers, and holding-tank areas)\u003c\/li\u003e\n\u003cli\u003eYou work with cryogenic gases (liquid oxygen, liquid nitrogen, liquid argon — boil-off displaces atmospheric oxygen in enclosed spaces)\u003c\/li\u003e\n\u003cli\u003eYou work in a semiconductor fab or a similar cleanroom process environment (inerted glove boxes, process-gas rooms)\u003c\/li\u003e\n\u003cli\u003eYou maintain medical gas storage facilities (bulk O2, but also large nitrogen or argon storage)\u003c\/li\u003e\n\u003cli\u003eYou work pharmaceutical or specialty-chemical operations with nitrogen-purged reactors, isolators, or storage\u003c\/li\u003e\n\u003cli\u003eYou need audit-ready O2 exposure logs for OSHA recordkeeping under 29 CFR 1910.146\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/02\/SST1A_O2_V70.upg\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Firmware Download\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eFirmware Download\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e \u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-O — O2 0–25% vol. Serviceable, Real Time Display (Oxygen)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is OSHA's oxygen threshold for confined-space entry?\u003c\/summary\u003e\n\u003cp\u003eUnder 29 CFR 1910.146 (permit-required confined space), OSHA classifies an atmosphere with less than 19.5% O2 by volume as oxygen-deficient and an atmosphere with more than 23.5% O2 as oxygen-enriched (a fire and combustion hazard). Below 19.5%, entry is not permitted without supplied-air respiratory protection under 29 CFR 1910.134. Below 23.5% (on the enriched side), combustion risk rises rapidly — many materials that don't burn in normal air will ignite readily in an oxygen-enriched atmosphere.\u003c\/p\u003e\n\u003cp\u003eNIOSH's IDLH threshold for oxygen deficiency is 6% by volume — below that level, workers can lose consciousness within seconds. Cognitive impairment begins well before IDLH: at approximately 16% O2, judgment and reaction time are noticeably degraded; at 12%, workers may not recognize danger; at 8%, unconsciousness typically occurs within a few minutes. This is why the SST1-O alarm at 19.5% is not a comfort threshold — it is the regulatory line that triggers OSHA's protective requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is oxygen deficiency more dangerous than most workers realize?\u003c\/summary\u003e\n\u003cp\u003eOxygen deficiency has no sensory warning. The gases that displace oxygen in industrial atmospheres — nitrogen, argon, helium, carbon dioxide, methane — are colorless, odorless, and non-irritating at the concentrations at which they displace enough O2 to be dangerous. There is nothing a worker's senses can detect until symptoms appear.\u003c\/p\u003e\n\u003cp\u003eThe physiological mechanism is more insidious than most workers understand. Silent hypoxia produces cognitive impairment before physical symptoms. At 16% O2, judgment and reaction time are affected — but at that concentration, workers also lose the ability to accurately assess their own condition. In many oxygen-deficiency fatalities, the tragic pattern is: a worker enters a space unaware it is oxygen-deficient; a colleague enters to help; the rescuer is affected before completing the rescue. Continuous O2 monitoring in any atmosphere subject to displacement is the only reliable warning system.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-O?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas O2 monitors are single-use — when the sensor reaches end-of-life (typically 1–2 years for oxygen sensors), the whole unit gets scrapped and replaced. The SST1 platform is designed to be serviced: the O2 sensor cell is replaceable, and the battery is also replaceable (2-year rating). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor or battery needs replacement.\u003c\/p\u003e\n\u003cp\u003eOxygen sensors drift as they age, and drift on an O2 monitor is silent. A sensor that has lost 10–15% responsiveness will still show readings that look normal — but the alarm may not fire at the concentration where it was set. Replacing the sensor cell restores full responsiveness without buying a new instrument.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often should I bump test and calibrate the SST1-O?\u003c\/summary\u003e\n\u003cp\u003eBump test before every use — in the case of an O2 sensor, the bump test is typically a fresh-air baseline check (confirming the sensor reads ~20.9% in normal atmosphere) plus a controlled dilution test to confirm the alarm fires at the setpoint. Calibration is a longer procedure using certified span gas.\u003c\/p\u003e\n\u003cp\u003eManufacturer recommendation for the SST1 platform is calibration every six months at minimum. Operations with continuous oxygen displacement exposure (breweries with active fermentation, cryogenic storage rooms, semiconductor process bays) often calibrate more frequently — quarterly or after any alarm event — because O2 sensor drift accelerates in altered-atmosphere environments. The \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e automates both bump test and calibration in about 60 seconds per unit and produces compliance logs under 29 CFR 1910.146 recordkeeping.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-O work with the WatchGas SST-DOCK docking station?\u003c\/summary\u003e\n\u003cp\u003eYes. The SST1-O is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for bump testing, calibration, and datalogging. If you're running a fleet of SST1 monitors (SST1-O for O2, SST1-H for H2S, SST1-M for CO, and other gas variants), the SST-DOCK handles them all interchangeably and generates timestamped logs suitable for OSHA audits.\u003c\/p\u003e\n\u003cp\u003eThe bump test plus calibration workflow takes about 60 seconds per unit — fast enough to run a fleet through end-of-shift without slowing crew turnover.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-O after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-O with factory-trained technicians in-house. That covers sensor replacement, battery replacement, calibration, firmware updates, and warranty support. Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your oxygen-deficiency monitoring program with someone who understands confined-space, inert-atmosphere, and cryogenic operations — not a call-center script.\u003c\/p\u003e\n\u003cp\u003ePK Safety also handles BW\/Honeywell (Factory Authorized), RKI, and RAE Systems monitors under the same roof, so a mixed-brand fleet doesn't mean shipping to multiple service centers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure the SST1-O is the right monitor for your oxygen-deficiency exposure program? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows silent-hypoxia work environments and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364430191,"sku":"WG01-SST1-O","price":210.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-O2800x800compressed.jpg?v=1757094947"},{"product_id":"watchgas-sst1-serviceable-ph3-gas-detector-sst1-p","title":"WatchGas SST1 Serviceable PH3 Gas Detector SST1-P","description":"\u003cp\u003e\u003cstrong\u003ePhosphine isn't an accidental contaminant. Grain fumigators use it deliberately. Semiconductor doping requires it. Chemical manufacturers make it. That intentional use flips the safety story: instead of \"is there a leak?\" the question becomes \"has the atmosphere cleared below OSHA's exposure limit so it's compliant to re-enter?\"\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you fumigate grain silos, treat structural pests with aluminum phosphide, inspect fumigated shipping containers at a port, run a semiconductor doping process, or manufacture organophosphorus chemicals, phosphine (PH3) is part of your workflow — not a surprise contaminant. Your monitoring question isn't \"is there a leak somewhere I don't know about?\" It's *\"is the atmosphere ready for re-entry, transit, or the next process step?\"* That requires a continuous ppm reading, not a smell check.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-P Serviceable Phosphine Gas Detector gives you a number instead of a nose.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIt reads phosphine continuously in ppm across a 0–20 ppm range — well below the NIOSH IDLH threshold of 50 ppm and spanning the entire OSHA\/NIOSH\/ACGIH compliance range with headroom. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA (0.3 ppm PEL under 29 CFR 1910.1000 Table Z-1), NIOSH (0.3 ppm TWA + 1 ppm STEL), ACGIH (0.05 ppm TLV-TWA + 0.15 ppm STEL after the 2015 revision, significantly stricter than OSHA), or a stricter internal exposure program.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy grain fumigators, port safety inspectors, and semiconductor safety engineers pick the SST1 line for phosphine monitoring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous PH3 monitoring in ppm with configurable Low, High, TWA, and STEL alarms\u003c\/li\u003e\n\u003cli\u003e0–20 ppm measurement range sized for compliance monitoring — covers the full OSHA\/NIOSH\/ACGIH regulatory range and well beyond, but stays below the NIOSH IDLH threshold of 50 ppm\u003c\/li\u003e\n\u003cli\u003eServiceable sensor — replace the phosphine sensor cell instead of the whole unit at end-of-life\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty (vs. the industry-typical 2 years); sensor warranty is 1 year, reflecting the specialty chemistry of phosphine sensors\u003c\/li\u003e\n\u003cli\u003e3-year replaceable battery based on typical alarm exposure\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology — compact, robust, temperature-tolerant\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App integration for datalogging\u003c\/li\u003e\n\u003cli\u003eVibration + audible + visual alarms — you notice it at a silo entry or a fumigated container inspection\u003c\/li\u003e\n\u003cli\u003eBump test and calibration compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e; compliance check-in compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePH3 (phosphine)\u003c\/td\u003e\n\u003ctd\u003e0 – 20 ppm\u003c\/td\u003e\n\u003ctd\u003e1 ppm\u003c\/td\u003e\n\u003ctd\u003e2 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the PH3 sensor drifts or needs replacement, send the unit to us. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your phosphine monitoring workflow — whether that's post-fumigation re-entry, container transit inspection, or semiconductor cleanroom leak detection — with someone who understands the SST1 platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou run grain fumigation — silo, warehouse, rail car, or shipping container treatment — and need continuous PH3 monitoring to verify atmospheres have cleared before re-entry\u003c\/li\u003e\n\u003cli\u003eYou handle metal phosphide fumigation — aluminum or magnesium phosphide tablets for structural pest control, rodent management, or bulk food storage\u003c\/li\u003e\n\u003cli\u003eYou inspect fumigated cargo at ports or shipping terminals — verifying containers are safe to open\u003c\/li\u003e\n\u003cli\u003eYou work in semiconductor manufacturing where PH3 is a doping gas — continuous leak monitoring during and around active doping processes\u003c\/li\u003e\n\u003cli\u003eYou manufacture organophosphorus chemicals, phosphine derivatives, or phosphide-based pesticides\u003c\/li\u003e\n\u003cli\u003eYou need continuous phosphine exposure logs for OSHA respiratory protection compliance (29 CFR 1910.134), EPA pesticide-worker protection standard compliance, or internal safety audits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant safety-scope note:\u003c\/strong\u003e the SST1-P's 0–20 ppm range is designed for compliance monitoring, leak detection, and post-fumigation re-entry verification — \u003cstrong\u003eNOT\u003c\/strong\u003e for entering an active high-concentration fumigation environment. Active fumigation entry requires SCBA (self-contained breathing apparatus) plus purpose-built high-range detection. If you're not sure what your monitoring workflow needs, call us at 800.829.9580 before ordering.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\" TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e \u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-P — SST1-P Serviceable Phosphine (PH3) Gas Detector, 0–20 ppm range, real-time display\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is the OSHA exposure limit for phosphine?\u003c\/summary\u003e\n\u003cp\u003eOSHA's permissible exposure limit (PEL) for phosphine is 0.3 ppm as an 8-hour time-weighted average under 29 CFR 1910.1000 Table Z-1. NIOSH's recommended exposure limit (REL) matches at 0.3 ppm TWA and adds a 1 ppm short-term exposure limit (STEL). ACGIH's TLV was significantly revised in 2015 to a much stricter 0.05 ppm TLV-TWA plus 0.15 ppm STEL — many facilities that use ACGIH as their internal target work to that lower standard rather than the OSHA PEL.\u003c\/p\u003e\n\u003cp\u003eThe SST1-P ships with default alarm setpoints of Low 1 ppm and High 2 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to your facility's specific standard — OSHA, NIOSH, ACGIH, or a stricter internal program.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhere is phosphine monitoring required — and what is the SST1-P NOT designed for?\u003c\/summary\u003e\n\u003cp\u003ePhosphine monitoring is a compliance requirement or best practice in several settings: grain fumigation (silos, warehouses, rail cars, shipping containers), metal phosphide fumigation (aluminum or magnesium phosphide tablets for structural pest control and rodent management), port and shipping operations (opening or inspecting fumigated cargo containers), semiconductor manufacturing (PH3 doping gas leak monitoring, cleanroom air quality), organophosphorus chemical manufacturing, and phosphide-based pesticide production.\u003c\/p\u003e\n\u003cp\u003eThe SST1-P's 0–20 ppm range is designed for those workflows — compliance monitoring, leak detection, and post-fumigation re-entry verification. It is \u003cstrong\u003eNOT\u003c\/strong\u003e designed for entering an active high-concentration fumigation environment. Active fumigation entry requires SCBA (self-contained breathing apparatus) plus purpose-built high-range detection equipment.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy can't I detect phosphine by smell?\u003c\/summary\u003e\n\u003cp\u003ePure phosphine is nearly odorless. Impure phosphine (mixed with diphosphine and other phosphine subproducts, which is what's typically generated by aluminum phosphide fumigation tablets) has a garlic or fishy smell, but the odor threshold varies widely — anywhere from about 0.02 ppm to 2 ppm depending on the specific impurities.\u003c\/p\u003e\n\u003cp\u003eThe problem: OSHA's exposure limit is 0.3 ppm, which sits at or below the reliable odor detection threshold. By the time you can clearly smell phosphine, you may already be over the exposure limit — and PH3 has rapid-onset symptoms (headache, dizziness, chest tightness at low ppm, progressing to severe effects at higher concentrations). A continuous ppm readout from the SST1-P shows actual concentration regardless of nose adaptation and produces the audit-ready exposure log that OSHA and pesticide-worker protection compliance programs require.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-P?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas monitors are single-use — when the sensor reaches end-of-life, the whole unit gets replaced. The SST1 platform is designed to be serviced: the phosphine sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.\u003c\/p\u003e\n\u003cp\u003eInstrument warranty is 3 years; sensor warranty is 1 year, which is shorter than SST1's H2S or CO variants and reflects the specialty chemistry of phosphine-selective sensors. PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the SST1-P work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003eYes to both. The SST1-P is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK compliance kiosk\u003c\/a\u003e for fleet-level compliance check-in, alarm history upload, and user\/location tracking.\u003c\/p\u003e\n\u003cp\u003eIf you're running a fleet of SST1-P monitors across a fumigation operation, a port, or a semiconductor facility, the SST-DOCK + SST-KIOSK combination covers your bump\/cal workflow and your compliance-tracking workflow together.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-P after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-P with factory-trained technicians in-house. That includes phosphine sensor replacement, calibration, firmware updates, and warranty support (3-year instrument warranty, 1-year sensor warranty). Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your phosphine monitoring workflow with someone who knows the SST1 platform — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit for your workflow? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows phosphine monitoring and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211364462959,"sku":"WG01-SST1-P","price":420.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-Serviceable-PH3800x800compressed.jpg?v=1757098878"},{"product_id":"watchgas-sst1-serviceable-so2-gas-detector-sst1-s","title":"WatchGas SST1 Serviceable SO2 Gas Detector SST1-S","description":"\u003cp\u003e\u003cstrong\u003eYou'll smell sulfur dioxide before you can see it — but by the time you're smelling it, you may already be at OSHA's permissible exposure limit.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSO2 has a pungent, unmistakable odor that most workers can detect between 0.5 and 3 ppm. That's the problem: OSHA's permissible exposure limit is 5 ppm as an 8-hour time-weighted average, and NIOSH's more conservative recommended limit is 2 ppm TWA with a 5 ppm short-term exposure limit. The concentration where you can smell SO2 and the concentration where you're already over the exposure limit overlap. Smell isn't a reliable measure of what you're breathing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe WatchGas SST1-S Serviceable SO2 Gas Detector gives you a number instead of a nose.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt reads sulfur dioxide continuously in ppm across a 0–100 ppm range — spanning OSHA's PEL of 5 ppm through the NIOSH IDLH threshold of 100 ppm. Default alarm setpoints ship at Low 2 ppm (matching the NIOSH REL TWA) and High 5 ppm (matching OSHA's PEL and the NIOSH REL STEL). Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA, NIOSH, ACGIH, or a stricter internal program.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy refinery operators, mill supervisors, and smelter safety managers pick the SST1 line:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous SO2 monitoring in ppm with configurable Low, High, TWA, and STEL alarms — ship defaults already aligned to NIOSH REL\u003c\/li\u003e\n\u003cli\u003eServiceable sensor — replace the SO2 sensor cell instead of the whole unit at end-of-life\u003c\/li\u003e\n\u003cli\u003e3-year instrument warranty (vs. the industry-typical 2 years) with a 2-year sensor warranty\u003c\/li\u003e\n\u003cli\u003e3-year replaceable battery based on typical alarm exposure\u003c\/li\u003e\n\u003cli\u003eSolid polymer sensor technology — compact, robust, temperature-tolerant\u003c\/li\u003e\n\u003cli\u003eNFC configuration and WatchGas App integration for datalogging\u003c\/li\u003e\n\u003cli\u003eVibration + audible + visual alarms — you notice it on the operating floor or the boiler deck\u003c\/li\u003e\n\u003cli\u003eBump test and calibration compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK\u003c\/a\u003e; compliance check-in compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSensor and alarm specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eGas measuring range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLow alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh alarm (default)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSO2\u003c\/td\u003e\n\u003ctd\u003e0 – 100 ppm\u003c\/td\u003e\n\u003ctd\u003e2 ppm\u003c\/td\u003e\n\u003ctd\u003e5 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e We also handle BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the SO2 sensor drifts or needs replacement, send the unit to us — you're not shipping equipment into a black box. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your sulfur dioxide monitoring setup with someone who understands SO2 detection and the WatchGas SST platform.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis is right for you if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou work in petroleum refining — sour crude handling, hydrotreating, sulfur recovery units\u003c\/li\u003e\n\u003cli\u003eYou operate in pulp and paper — Kraft process, black liquor recovery, on-site sulfur recovery\u003c\/li\u003e\n\u003cli\u003eYou supervise a steel plant, metal smelting operation (copper, zinc, lead), or sulfuric acid facility\u003c\/li\u003e\n\u003cli\u003eYou run boilers, coal-fired power generation, or industrial combustion equipment where SO2 is present in flue gas\u003c\/li\u003e\n\u003cli\u003eYou work in mining or mineral processing with sulfide ore roasting or smelting\u003c\/li\u003e\n\u003cli\u003eYou need continuous SO2 exposure logs for OSHA respiratory protection compliance, EPA emissions monitoring, or internal safety audits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/08\/MKT-SST1-SERV-DS-V1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/01\/MKT-SST1-MAN-V1.5.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"TN no. 27\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003e How to Reset User Data and Restore Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST1-S — SST1-S Serviceable SO2 (Sulfur Dioxide) Gas Detector, 0–100 ppm range, real-time display\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat is the OSHA exposure limit for sulfur dioxide?\u003c\/summary\u003e\n\u003cp\u003eOSHA's permissible exposure limit (PEL) for sulfur dioxide is 5 ppm as an 8-hour time-weighted average, under 29 CFR 1910.1000 Table Z-1. NIOSH's recommended exposure limit (REL) is more conservative at 2 ppm TWA plus a 5 ppm short-term exposure limit (STEL) over any 15-minute period. ACGIH sets an even stricter TLV-STEL of 0.25 ppm, which some industrial safety programs use as an internal target.\u003c\/p\u003e\n\u003cp\u003eThe SST1-S ships with default alarm setpoints of Low 2 ppm and High 5 ppm — already aligned to the NIOSH REL. Configurable low, high, TWA, and STEL alarms let you tune the monitor to your facility's exposure program (OSHA, NIOSH, ACGIH, or a stricter internal standard).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhich industries typically require sulfur dioxide monitoring?\u003c\/summary\u003e\n\u003cp\u003eSO2 monitoring is a compliance requirement or best practice across a range of settings: petroleum refining (sour crude processing, hydrotreating, sulfur recovery units), pulp and paper (Kraft process, black liquor recovery, on-site sulfur recovery), metal smelting operations (copper, zinc, lead sulfide ore processing), sulfuric acid manufacturing, coal-fired power generation, industrial boilers and combustion equipment, and mining and mineral processing.\u003c\/p\u003e\n\u003cp\u003eAny workplace where SO2 is produced or handled also falls under OSHA's respiratory protection standard (29 CFR 1910.134). Facilities in populated areas may additionally have EPA ambient-air and emissions-monitoring obligations under the Clean Air Act.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eCan I detect SO2 by smell instead of using a monitor?\u003c\/summary\u003e\n\u003cp\u003eNot reliably. Sulfur dioxide has a pungent, sharp odor most workers can detect between 0.5 and 3 ppm — but that range overlaps with OSHA's exposure limit of 5 ppm. Individual odor detection thresholds vary widely, and chronic exposure can dull the sensation. Some workers smell SO2 well below the exposure limit; others don't notice it until they're already above it.\u003c\/p\u003e\n\u003cp\u003eA continuous readout in ppm from the SST1-S shows the actual concentration regardless of nose sensitivity — and produces the audit-ready exposure log that compliance programs and internal safety reviews need.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat does \"serviceable\" mean on the SST1-S?\u003c\/summary\u003e\n\u003cp\u003eTraditional single-gas monitors are single-use — when the sensor reaches end-of-life (typically 2–3 years), the whole unit gets replaced. The SST1 platform is designed to be serviced: the SO2 sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan. Instrument warranty is 3 years; sensor warranty is 2 years. PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eDoes the SST1-S work with the WatchGas SST-DOCK and SST-KIOSK?\u003c\/summary\u003e\n\u003cp\u003eYes to both. The SST1-S is fully compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eWatchGas SST-KIOSK compliance kiosk\u003c\/a\u003e for fleet-level compliance check-in, alarm history upload, and user\/location tracking.\u003c\/p\u003e\n\u003cp\u003eIf you're running a fleet of SST1 monitors across a refinery, mill, or smelter, the SST-DOCK + SST-KIOSK combination covers your bump\/cal workflow and your compliance-tracking workflow together.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow does PK Safety support the SST1-S after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST line and services the SST1-S with factory-trained technicians in-house. That includes SO2 sensor replacement when the cell reaches end-of-life, calibration, firmware updates, and warranty support (3-year instrument warranty, 2-year sensor warranty). Call \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your sulfur dioxide monitoring setup with someone who knows the SST1 platform — not a call-center script.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp\u003e\u003cstrong\u003eNot sure this is the right fit? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows sulfur dioxide monitoring and the WatchGas SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52211379405167,"sku":"WG01-SST1-S","price":290.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-SO2800x800compressed.jpg?v=1757095487"},{"product_id":"watchgas-replacement-h2s-sensor-sst-spare-h","title":"WatchGas Replacement H2S Sensor SST-SPARE-H","description":"\u003cp\u003e\u003cstrong\u003eWhen your H2S sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement H2S Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eWatchGas SST1-H Serviceable H2S Gas Detector\u003c\/a\u003e and any WatchGas SST4-series multi-gas monitor with an H2S sensor slot, extending the monitor's service life beyond the original sensor's lifespan.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement H2S electrochemical sensor cell for the serviceable SST1-H monitor and any SST4-series multi-gas monitor (SST4-MINI, SST4-MICRO, SST4-PUMP) that includes H2S in its sensor set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-h2s-gas-detector-sst1-h-24\"\u003eSST1-H-24 (2-year)\u003c\/a\u003e or \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-h2s-gas-detector-sst1-h-36\"\u003eSST1-H-36 (3-year)\u003c\/a\u003e alert-only monitors — those are non-serviceable by design and are discarded at end-of-life. If you're using the alert-only variants, you replace the whole monitor, not the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSolid polymer electrochemical sensor technology.\u003c\/strong\u003e The dry-cell design eliminates the liquid electrolyte used in traditional electrochemical sensors, giving the cell better long-term stability, no leak risk in truck-bed or field storage, and better tolerance for temperature extremes. It also produces ultra-low power consumption compared to older H2S sensor designs — one of the reasons the SST1-H can run for its full battery life without a mid-cycle charge.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an H2S sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the H2S channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed and calibration reliability starts trending down\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence (industry best practice for high-stakes confined-space programs)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-H:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-H serviceable H2S monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eOwners of the WatchGas SST4-MINI, SST4-MICRO, or SST4-PUMP multi-gas monitors whose H2S channel needs replacement\u003c\/li\u003e\n\u003cli\u003eConfined-space program managers doing scheduled sensor rotations to stay ahead of drift and out of compliance risk\u003c\/li\u003e\n\u003cli\u003eSafety supervisors at facilities where H2S is a chronic hazard (petroleum, wastewater, pulp and paper, agricultural sludge handling) and monitor uptime matters\u003c\/li\u003e\n\u003cli\u003eFleet managers running proactive maintenance cycles rather than reactive replacements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH2S (hydrogen sulfide)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eSST1-H, SST4-MINI, SST4-MICRO, SST4-PUMP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the full detection range\u003c\/li\u003e\n\u003cli\u003eLong operational lifetime — 2-year warranty\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eHigh precision at low H2S concentrations — critical for NIOSH REL-aligned monitoring\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified H2S standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your H2S sensor replacement workflow with someone who understands the SST1 \/ SST4 platform.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-H — WatchGas Replacement H2S Sensor\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-H sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-H is compatible with any WatchGas SST-platform monitor that includes an H2S sensor slot:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eSST1-H Serviceable H2S Gas Detector\u003c\/a\u003e — the single-gas H2S monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e — H2S is one of the four sensors in the standard configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e — same H2S sensor slot\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP 4-Gas Detector\u003c\/a\u003e — same H2S sensor slot\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SST-SPARE-H is NOT compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-h2s-gas-detector-sst1-h-24\"\u003eSST1-H-24 (2-year)\u003c\/a\u003e or \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-h2s-gas-detector-sst1-h-36\"\u003eSST1-H-36 (3-year)\u003c\/a\u003e alert-only monitors — those are non-serviceable by design. When their sensors reach end-of-life, you replace the whole monitor, not the sensor cell.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I know it's time to replace my H2S sensor?\u003c\/summary\u003e\n\u003cp\u003eFour common signals:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor fails a bump test\u003c\/strong\u003e and won't recover after recalibration. Bump testing before each use is the industry-standard way to verify sensor response; a persistent bump failure means the sensor cell is no longer detecting reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration drift exceeds acceptable tolerance\u003c\/strong\u003e across successive cal events. If each calibration is nudging the sensor's baseline further from the reference, the cell is degrading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe monitor displays a sensor fault code\u003c\/strong\u003e specific to the H2S channel. Cell exhaustion, extreme temperature or humidity exposure, or physical damage can trigger a fault.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor is out of its warranty period.\u003c\/strong\u003e The SST-SPARE-H carries a 2-year warranty. Beyond that, sensor reliability trends down and proactive replacement is best practice for confined-space entry programs where sensor accuracy is the difference between compliance and a missed alarm.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-H myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement — the sensor cell is accessed through the monitor's service compartment, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a full calibration to verify the new sensor's response against a known H2S standard.\u003c\/p\u003e\n\u003cp\u003eIf you'd rather not run the swap yourself — for example, if you don't have a calibration workflow set up, or if you want a factory-trained technician to verify the sensor's performance across its full range before it goes back into service — send the monitor to PK Safety. We handle the swap, full calibration verification, and return-to-service in-house.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-H monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-H sensor cell costs $160. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2s-gas-detector-sst1-h\"\u003eSST1-H monitor\u003c\/a\u003e costs $290. If your monitor's housing, display, battery, and electronics are in good working order and only the H2S sensor has drifted or reached end-of-life, the sensor replacement is the more cost-effective path — roughly 55% of the full-monitor price for the maintenance action that gets your fleet back to compliance.\u003c\/p\u003e\n\u003cp\u003eIf the monitor itself has physical damage, a battery that no longer holds charge, or a display that's failing, a full monitor replacement is the better path. PK Safety can help you evaluate — call 800.829.9580 with your monitor's condition and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is the SST-SPARE-H calibrated after installation?\u003c\/summary\u003e\n\u003cp\u003eAfter installing the new sensor cell in the monitor, run a full calibration cycle using an H2S calibration gas standard. For multi-gas monitors, use the \u003ca href=\"https:\/\/pksafety.com\/products\/pk-safety-watchgas-equivalent-4-gas-calibration-gas-mix-34-liter\"\u003ePK Safety WatchGas Equivalent 4-Gas Calibration Gas Mix\u003c\/a\u003e (contains LEL, O2, CO, H2S at cal-standard concentrations). For a dedicated single-gas cal, use a standalone H2S cylinder (typically 25 ppm H2S in air balance).\u003c\/p\u003e\n\u003cp\u003eAutomated calibration is fastest using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e — one docking cycle handles bump test and full calibration in about 60 seconds. Manual calibration through the monitor's menu also works if the SST-DOCK isn't part of your workflow.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does PK Safety support the SST-SPARE-H after purchase?\u003c\/summary\u003e\n\u003cp\u003ePK Safety carries the full WatchGas SST platform, including replacement sensors for every gas in the SST1 and SST4 sensor sets. We service SST1 and SST4 monitors in-house with factory-trained technicians — if your sensor swap results in a persistent calibration issue or the new sensor doesn't seat correctly, send us the monitor and we'll troubleshoot.\u003c\/p\u003e\n\u003cp\u003eCall \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your sensor replacement workflow, or to arrange in-house sensor swap and calibration verification.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether a sensor swap or full monitor replacement is the right path? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST platform's service ecosystem will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671720718703,"sku":"WG01-SST-SPARE-H","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-H---Watchgas-SST-sensor-H2S-0-500ppm-for-SST1---3---K1E800x800compressed.jpg?v=1771007980"},{"product_id":"watchgas-replacement-co-sensor-sst-spare-m","title":"WatchGas Replacement CO Sensor SST-SPARE-M","description":"\u003cp\u003e\u003cstrong\u003eWhen your CO sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement CO Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eWatchGas SST1-M Serviceable CO Gas Detector\u003c\/a\u003e and any WatchGas SST4-series multi-gas monitor with CO in its standard 4-gas sensor set.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCarbon monoxide is odorless, colorless, and tasteless.\u003c\/strong\u003e Workers get zero sensory warning that CO is accumulating in an enclosed space — not until the physiological effects kick in (headache, dizziness, confusion), and by then the exposure is already past regulatory limits and can escalate quickly. That physiology raises the stakes on sensor accuracy: a drifting CO sensor doesn't just mean an inconvenient recalibration — it means the monitor may not alarm before workers are already showing symptoms. For CO monitoring, sensor freshness is a life-safety input, not an inventory line item.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement CO electrochemical sensor cell for the serviceable SST1-M monitor and any SST4-series multi-gas monitor (SST4-MINI, SST4-MICRO, SST4-PUMP). CO is standard in all three SST4 variants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-co-gas-detector-sst1-m-24\"\u003eSST1-M-24 (2-year)\u003c\/a\u003e or \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-co-gas-detector-sst1-m-36\"\u003eSST1-M-36 (3-year)\u003c\/a\u003e alert-only monitors — those are non-serviceable by design and are discarded at end-of-life. If you're using the alert-only variants, you replace the whole monitor, not the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSolid polymer electrochemical sensor technology.\u003c\/strong\u003e The dry-cell design eliminates the liquid electrolyte used in traditional electrochemical sensors, giving the cell better long-term stability, no leak risk in truck-bed or field storage, and better tolerance for temperature extremes. Ultra-low power consumption compared to older CO sensor designs — one of the reasons the SST1-M can run for its full battery life without a mid-cycle charge.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace a CO sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the CO channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed and calibration reliability starts trending down\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence — especially valuable for CO because sensor drift can silently defeat the monitor's core protective function\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-M:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-M serviceable CO monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eOwners of the WatchGas SST4-MINI, SST4-MICRO, or SST4-PUMP multi-gas monitors whose CO channel needs replacement\u003c\/li\u003e\n\u003cli\u003eHVAC service companies, boiler operators, and heating contractors maintaining fleet monitors year-round\u003c\/li\u003e\n\u003cli\u003eFacility managers at garages, tunnels, parking structures, propane forklift operations — environments where CO exposure is a chronic hazard\u003c\/li\u003e\n\u003cli\u003eFire departments and post-fire investigation teams maintaining monitor accuracy for structural response work\u003c\/li\u003e\n\u003cli\u003eGrain drying operations, steel and foundry work, mining, and enclosed welding operations — industrial CO-exposure environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCO (carbon monoxide)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eSST1-M, SST4-MINI, SST4-MICRO, SST4-PUMP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the full detection range\u003c\/li\u003e\n\u003cli\u003eLong operational lifetime — 2-year warranty\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eHigh precision at low CO concentrations — critical for NIOSH REL-aligned monitoring (35 ppm TWA)\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified CO standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your CO sensor replacement workflow with someone who understands the SST1 \/ SST4 platform.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-M — WatchGas Replacement CO Sensor\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-M sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-M is compatible with any WatchGas SST-platform monitor that includes a CO sensor slot:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eSST1-M Serviceable CO Gas Detector\u003c\/a\u003e — the single-gas CO monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e — CO is one of the four sensors in the standard configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e — same CO sensor slot\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP 4-Gas Detector\u003c\/a\u003e — same CO sensor slot\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SST-SPARE-M is NOT compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-co-gas-detector-sst1-m-24\"\u003eSST1-M-24 (2-year)\u003c\/a\u003e or \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-3-year-co-gas-detector-sst1-m-36\"\u003eSST1-M-36 (3-year)\u003c\/a\u003e alert-only monitors — those are non-serviceable by design. When their sensors reach end-of-life, you replace the whole monitor, not the sensor cell.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I know it's time to replace my CO sensor?\u003c\/summary\u003e\n\u003cp\u003eFour common signals:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor fails a bump test\u003c\/strong\u003e and won't recover after recalibration. Bump testing before each use is the industry-standard way to verify sensor response; a persistent bump failure means the sensor cell is no longer detecting reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration drift exceeds acceptable tolerance\u003c\/strong\u003e across successive cal events. If each calibration is nudging the sensor's baseline further from the reference, the cell is degrading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe monitor displays a sensor fault code\u003c\/strong\u003e specific to the CO channel. Cell exhaustion, extreme temperature or humidity exposure, or physical damage can trigger a fault.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor is out of its warranty period.\u003c\/strong\u003e The SST-SPARE-M carries a 2-year warranty. Beyond that, sensor reliability trends down and proactive replacement is best practice — especially for CO, where sensor drift can silently defeat the monitor's core protective function.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does CO sensor drift matter more than drift on other gases?\u003c\/summary\u003e\n\u003cp\u003eCarbon monoxide is odorless, colorless, and tasteless. Unlike H2S (rotten-egg smell at low ppm), ammonia (pungent), or sulfur dioxide (sharp acid smell), CO gives workers zero sensory warning that concentrations are building up. Symptoms of CO exposure — headache, dizziness, confusion, nausea — typically don't kick in until concentrations are already past regulatory limits, and CO poisoning can escalate quickly.\u003c\/p\u003e\n\u003cp\u003eThat physiology has one operational implication for CO monitoring: the monitor isn't a backup to what workers can already sense. It IS the warning system. If the CO sensor drifts and the monitor no longer alarms at the intended threshold, workers won't notice a substitute warning — they'll notice symptoms. For CO monitoring more than any other gas in the SST platform, proactive sensor replacement on a defined cadence is worth the discipline.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-M myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement — the sensor cell is accessed through the monitor's service compartment, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a full calibration to verify the new sensor's response against a known CO standard.\u003c\/p\u003e\n\u003cp\u003eIf you'd rather not run the swap yourself — for example, if you don't have a calibration workflow set up, or if you want a factory-trained technician to verify the sensor's performance across its full range before it goes back into service — send the monitor to PK Safety. We handle the swap, full calibration verification, and return-to-service in-house.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-M monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-M sensor cell costs $160. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-co-gas-detector-sst1-m\"\u003eSST1-M monitor\u003c\/a\u003e costs $370. If your monitor's housing, display, battery, and electronics are in good working order and only the CO sensor has drifted or reached end-of-life, the sensor replacement is the more cost-effective path — roughly 43% of the full-monitor price for the maintenance action that gets your fleet back to compliance.\u003c\/p\u003e\n\u003cp\u003eIf the monitor itself has physical damage, a battery that no longer holds charge, or a display that's failing, a full monitor replacement is the better path. PK Safety can help you evaluate — call 800.829.9580 with your monitor's condition and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is the SST-SPARE-M calibrated after installation?\u003c\/summary\u003e\n\u003cp\u003eAfter installing the new sensor cell in the monitor, run a full calibration cycle using a CO calibration gas standard. For multi-gas monitors, use the \u003ca href=\"https:\/\/pksafety.com\/products\/pk-safety-watchgas-equivalent-4-gas-calibration-gas-mix-34-liter\"\u003ePK Safety WatchGas Equivalent 4-Gas Calibration Gas Mix\u003c\/a\u003e (contains LEL, O2, CO, H2S at cal-standard concentrations). For a dedicated single-gas cal, use a standalone CO cylinder (typically 50 ppm CO in air balance).\u003c\/p\u003e\n\u003cp\u003eAutomated calibration is fastest using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e — one docking cycle handles bump test and full calibration in about 60 seconds. Manual calibration through the monitor's menu also works if the SST-DOCK isn't part of your workflow.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether a sensor swap or full monitor replacement is the right path? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST platform's service ecosystem will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671727960431,"sku":"WG01-SST-SPARE-M","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-M---Watchgas-SST-sensor-CO-0-1000ppm-for-all---3---K1E800x800compressed.jpg?v=1771007939"},{"product_id":"watchgas-replacement-o2-sensor-sst-spare-o","title":"WatchGas Replacement O2 Sensor SST-SPARE-O","description":"\u003cp\u003e\u003cstrong\u003eWhen your O2 sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement O2 Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-o2-gas-detector-sst1-o\"\u003eWatchGas SST1-O Serviceable O2 Gas Detector\u003c\/a\u003e and any WatchGas SST4-series multi-gas monitor with O2 in its standard 4-gas sensor set.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOxygen deficiency is silent.\u003c\/strong\u003e The gases that displace oxygen from an enclosed space — nitrogen, argon, helium, CO2, methane — are themselves colorless and odorless. Workers get zero sensory warning that the atmosphere they're breathing has become dangerous. Cognitive impairment begins around 16% oxygen; by 12%, workers may not recognize the danger they're in. For O2 monitoring more than any other gas, sensor accuracy is the difference between recognizing a hypoxic environment and getting caught by it. A drifting O2 sensor doesn't warn you it's drifting — it just quietly stops flagging the atmosphere that will impair you.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement O2 electrochemical sensor cell for the serviceable SST1-O monitor and any SST4-series multi-gas monitor (SST4-MINI, SST4-MICRO, SST4-PUMP). O2 is standard in all three SST4 variants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-o2-gas-detector-sst1-o-24\"\u003eSST1-O-24 (2-year)\u003c\/a\u003e alert-only monitor — that one is non-serviceable by design and is discarded at end-of-life. If you're using the alert-only variant, you replace the whole monitor, not the sensor. (There is no 3-year alert-only O2 variant in the SST1 line — O2 is a two-tier product family.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSolid polymer electrochemical sensor technology.\u003c\/strong\u003e The dry-cell design eliminates the liquid electrolyte used in traditional electrochemical sensors, giving the cell better long-term stability, no leak risk in truck-bed or field storage, and better tolerance for temperature extremes. Ultra-low power consumption compared to older O2 sensor designs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an O2 sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eFresh-air calibration drift exceeds acceptable tolerance across successive cal events\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the O2 channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed and calibration reliability starts trending down\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence — especially valuable for O2 because sensor drift can silently defeat the monitor's core protective function against hypoxic environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-O-RPL:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-O serviceable O2 monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eOwners of the WatchGas SST4-MINI, SST4-MICRO, or SST4-PUMP multi-gas monitors whose O2 channel needs replacement\u003c\/li\u003e\n\u003cli\u003eConfined-space entry teams (petrochemical, water\/wastewater, industrial manufacturing) whose SOP requires accurate O2 monitoring before entry\u003c\/li\u003e\n\u003cli\u003eCryogenics operators (LOX \/ liquid nitrogen \/ liquid argon boil-off environments)\u003c\/li\u003e\n\u003cli\u003eFood and beverage plants running inert-atmosphere packaging (N2 purging can silently displace room O2 in enclosed process areas)\u003c\/li\u003e\n\u003cli\u003eBreweries and wineries where fermentation CO2 can accumulate in cellars, tanks, and closed process spaces\u003c\/li\u003e\n\u003cli\u003eSemiconductor fabs with N2 purge environments\u003c\/li\u003e\n\u003cli\u003ePharmaceutical facilities operating inert-atmosphere reactors\u003c\/li\u003e\n\u003cli\u003eMedical gas facilities storing or handling compressed inert gases\u003c\/li\u003e\n\u003cli\u003eFire investigation teams and industrial rescue crews maintaining monitor accuracy for post-fire, mine, and confined-space response\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eO2 (oxygen)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eSST1-O, SST4-MINI, SST4-MICRO, SST4-PUMP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the full detection range (0–25% O2)\u003c\/li\u003e\n\u003cli\u003eLong operational lifetime — 2-year warranty\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eHigh precision at the OSHA 19.5% oxygen-deficient threshold — critical for confined-space entry compliance\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, fresh-air and span calibration verification, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your O2 sensor replacement workflow with someone who understands the SST1 \/ SST4 platform.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-O-RPL — WatchGas Replacement O2 Sensor (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-O-RPL sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-O-RPL is compatible with any WatchGas SST-platform monitor that includes an O2 sensor slot:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-o2-gas-detector-sst1-o\"\u003eSST1-O Serviceable O2 Gas Detector\u003c\/a\u003e — the single-gas O2 monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e — O2 is one of the four sensors in the standard configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e — same O2 sensor slot\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP 4-Gas Detector\u003c\/a\u003e — same O2 sensor slot\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SST-O-RPL is NOT compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-o2-gas-detector-sst1-o-24\"\u003eSST1-O-24 (2-year)\u003c\/a\u003e alert-only monitor — that one is non-serviceable by design. There is no 3-year alert-only O2 variant in the SST1 line, so if you're using the SST1-O-24, replacement means a whole new monitor.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I know it's time to replace my O2 sensor?\u003c\/summary\u003e\n\u003cp\u003eFour common signals:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor fails a bump test\u003c\/strong\u003e or a fresh-air calibration — the monitor shows a reading materially different from 20.9% O2 in a known-clean atmosphere.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFresh-air calibration drift exceeds acceptable tolerance\u003c\/strong\u003e across successive cal events. If each fresh-air cal is drifting further from 20.9%, the cell is degrading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe monitor displays a sensor fault code\u003c\/strong\u003e specific to the O2 channel. Cell exhaustion, extreme temperature or humidity exposure, or physical damage can trigger a fault.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor is out of its warranty period.\u003c\/strong\u003e The SST-O-RPL carries a 2-year warranty. Beyond that, sensor reliability trends down and proactive replacement is best practice — especially for O2, where a drifting sensor is silently exposing workers to hypoxic conditions with no compensating sensory warning.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does O2 sensor drift matter more than drift on other gases?\u003c\/summary\u003e\n\u003cp\u003eBecause oxygen deficiency is silent. The gases that displace O2 in confined spaces — nitrogen, argon, helium, CO2, methane — are colorless and odorless. Workers get no sensory warning that the atmosphere is going hypoxic. Cognitive impairment begins around 16% O2; by the time O2 drops to 12%, workers may not recognize the danger they're in. Loss of consciousness follows quickly.\u003c\/p\u003e\n\u003cp\u003eThat physiology has one operational implication for O2 monitoring: the monitor is your only reliable warning system. If the O2 sensor drifts and the monitor no longer alarms at OSHA's 19.5% oxygen-deficient threshold, workers won't feel a substitute warning — they'll experience impairment. For O2 monitoring more than any other gas in the SST platform, proactive sensor replacement on a defined cadence is worth the discipline.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-O-RPL myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement — the sensor cell is accessed through the monitor's service compartment, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a fresh-air calibration (in a known-clean atmosphere at 20.9% O2) and ideally a span calibration using a known O2 concentration cal gas.\u003c\/p\u003e\n\u003cp\u003eIf you'd rather not run the swap yourself, or if you want a factory-trained technician to verify the sensor's performance across its full range before it goes back into service, send the monitor to PK Safety. We handle the swap, full calibration verification, and return-to-service in-house.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-O monitor?\u003c\/summary\u003e\n\u003cp\u003eHonest answer: this is closer than the H2S or CO cases. The SST-O-RPL sensor cell costs $160. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-o2-gas-detector-sst1-o\"\u003eSST1-O monitor\u003c\/a\u003e costs $210. The sensor swap saves you $50 vs. a full new monitor — real, but modest.\u003c\/p\u003e\n\u003cp\u003eThe economic case is strongest when:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour existing monitor's housing, battery, display, and electronics are still in good working order\u003c\/li\u003e\n\u003cli\u003eYou want to preserve the remaining useful life of the current monitor's non-sensor components\u003c\/li\u003e\n\u003cli\u003eYou already have a calibration workflow set up for sensor swaps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe full-monitor replacement case is stronger when:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe monitor itself is aging (battery no longer holds full charge, display or housing showing wear)\u003c\/li\u003e\n\u003cli\u003eYou don't have a sensor-swap calibration workflow in place\u003c\/li\u003e\n\u003cli\u003eYou want a fresh 3-year instrument warranty on top of the 2-year sensor warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 with your monitor's condition and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is the SST-O-RPL calibrated after installation?\u003c\/summary\u003e\n\u003cp\u003eO2 calibration has two steps that are slightly different from toxic-gas calibration:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eFresh-air calibration:\u003c\/strong\u003e in a known-clean atmosphere at 20.9% O2 (outside, or a verified breathing-air source), the monitor's fresh-air cal sets the sensor's baseline. This is the most important step for O2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpan calibration (optional but recommended):\u003c\/strong\u003e using an O2 calibration cylinder at a known concentration (typically 18% O2 in balance gas) to verify the sensor's response across the low-O2 alarm threshold.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eAutomated calibration is fastest using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e — one docking cycle handles fresh-air cal and bump test in about 60 seconds. For span cal, the \u003ca href=\"https:\/\/pksafety.com\/products\/pk-safety-watchgas-equivalent-4-gas-calibration-gas-mix-34-liter\"\u003ePK Safety WatchGas Equivalent 4-Gas Calibration Gas Mix\u003c\/a\u003e includes an O2-below-19.5% component for span verification, or use a dedicated O2 span cylinder.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether a sensor swap or full monitor replacement is the right path? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST platform's service ecosystem will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728025967,"sku":"WG01-SST-SPARE-O","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-O---Watchgas-SST-sensor-O2-800x800compressed.jpg?v=1771007716"},{"product_id":"watchgas-replacement-so2-sensor-sst-spare-s","title":"WatchGas Replacement SO2 Sensor SST-SPARE-S","description":"\u003cp\u003e\u003cstrong\u003eWhen your SO2 sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement SO2 Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eWatchGas SST1-S Serviceable SO2 Gas Detector\u003c\/a\u003e and any WatchGas SST4-series multi-gas monitor configured with an SO2 sensor slot.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSmell isn't a reliable backup when your SO2 sensor drifts.\u003c\/strong\u003e Sulfur dioxide has a pungent, unmistakable odor that most workers detect between 0.5 and 3 ppm. OSHA's permissible exposure limit is 5 ppm 8-hour TWA (29 CFR 1910.1000 Table Z-1), and NIOSH's more conservative REL is 2 ppm TWA plus a 5 ppm STEL. The range where you can smell SO2 overlaps the exposure limit — workers might notice a leak AT the limit, but not below it. A drifting SO2 sensor doesn't just mean a lagging alarm; it means workers may be exposed at NIOSH's TWA before they smell anything, and at OSHA's PEL before smell becomes strong enough to command attention. Sensor accuracy at low SO2 concentrations is the point of the monitor.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement SO2 electrochemical sensor cell for the serviceable SST1-S monitor and any WatchGas SST4-series multi-gas monitor that was configured with an SO2 sensor slot. Note that the SST4 platform's \u003cem\u003estandard\u003c\/em\u003e 4-gas sensor set is LEL\/O2\/CO\/H2S — SO2 is a custom configuration on SST4 monitors, not the default.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-so2-gas-detector-sst1-s-24\"\u003eSST1-S-24 (2-year)\u003c\/a\u003e alert-only monitor — that one is non-serviceable by design and is discarded at end-of-life. There is no 3-year alert-only SO2 variant in the SST1 line (two-tier SO2 product family, same structure as O2).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSolid polymer electrochemical sensor technology.\u003c\/strong\u003e The dry-cell design eliminates the liquid electrolyte used in traditional electrochemical sensors, giving the cell better long-term stability, no leak risk in truck-bed or field storage, and better tolerance for temperature extremes. Ultra-low power consumption compared to older SO2 sensor designs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an SO2 sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events, especially at the low end of the detection range where the OSHA PEL and NIOSH REL sit\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the SO2 channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed and calibration reliability starts trending down\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence — especially valuable in refinery, pulp mill, and smelter environments where SO2 exposure is continuous\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-S:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-S serviceable SO2 monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eOwners of WatchGas SST4-MINI, SST4-MICRO, or SST4-PUMP multi-gas monitors that were \u003cem\u003ecustom-configured\u003c\/em\u003e with an SO2 sensor slot (not the standard LEL\/O2\/CO\/H2S set)\u003c\/li\u003e\n\u003cli\u003eRefinery operators handling sour crude, hydrotreating, or sulfur recovery units\u003c\/li\u003e\n\u003cli\u003ePulp and paper mill supervisors running Kraft-process campaigns or on-site sulfur recovery inspections\u003c\/li\u003e\n\u003cli\u003eMetal smelter operations (copper, zinc, lead) maintaining continuous SO2 monitoring\u003c\/li\u003e\n\u003cli\u003eSulfuric acid manufacturing plants running ongoing exposure programs\u003c\/li\u003e\n\u003cli\u003eCoal-fired power plant operators monitoring boiler-outlet and stack SO2\u003c\/li\u003e\n\u003cli\u003eIndustrial boiler and combustion equipment operators\u003c\/li\u003e\n\u003cli\u003eMining and mineral processing operations with sulfide ore roasting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSO2 (sulfur dioxide)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eSST1-S, SST4-series (with SO2 sensor slot configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the full detection range\u003c\/li\u003e\n\u003cli\u003eLong operational lifetime — 2-year warranty\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eHigh precision at low SO2 concentrations — critical for NIOSH REL-aligned monitoring (2 ppm TWA \/ 5 ppm STEL)\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified SO2 standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your SO2 sensor replacement workflow with someone who understands the SST1 \/ SST4 platform.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-S — WatchGas Replacement SO2 Sensor (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-S sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-S is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eSST1-S Serviceable SO2 Gas Detector\u003c\/a\u003e — the single-gas SO2 monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003eWatchGas SST4-series multi-gas monitors (\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4-MICRO\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP\u003c\/a\u003e) \u003cstrong\u003eonly when custom-configured with an SO2 sensor slot\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SST4 platform's \u003cem\u003estandard\u003c\/em\u003e 4-gas sensor set is LEL\/O2\/CO\/H2S. If your SST4 monitor was ordered with the standard configuration, it doesn't have an SO2 slot and this sensor won't fit. If your SST4 was custom-configured with SO2 replacing one of the standard four gases (usually H2S is swapped out in favor of SO2 for refinery-specific work), then this sensor is the right replacement. Not sure which configuration your SST4 has? Call PK Safety at 800.829.9580 with your monitor's serial number.\u003c\/p\u003e\n\u003cp\u003eThe SST-SPARE-S is NOT compatible with the Limited-Life \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-2-year-so2-gas-detector-sst1-s-24\"\u003eSST1-S-24 (2-year)\u003c\/a\u003e alert-only monitor — that one is non-serviceable by design. There is no 3-year alert-only SO2 variant in the SST1 line.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I know it's time to replace my SO2 sensor?\u003c\/summary\u003e\n\u003cp\u003eFour common signals:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor fails a bump test\u003c\/strong\u003e and won't recover after recalibration. Bump testing before each use is the industry-standard way to verify sensor response; a persistent bump failure means the sensor cell is no longer detecting reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration drift exceeds acceptable tolerance\u003c\/strong\u003e across successive cal events, especially at the low end of the detection range — the concentrations where the OSHA PEL and NIOSH REL sit. A sensor that drifts high at 2 ppm is missing the NIOSH threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe monitor displays a sensor fault code\u003c\/strong\u003e specific to the SO2 channel. Cell exhaustion, extreme temperature or humidity exposure, or physical damage can trigger a fault.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor is out of its warranty period.\u003c\/strong\u003e The SST-SPARE-S carries a 2-year warranty. Beyond that, sensor reliability trends down and proactive replacement is best practice — especially in continuous SO2 environments like refineries, mills, and smelters where sensor drift is the difference between compliance and a missed exposure.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does SO2 sensor drift matter more than drift on other gases?\u003c\/summary\u003e\n\u003cp\u003eBecause SO2's odor detection threshold overlaps the OSHA exposure limit. Most workers can smell sulfur dioxide between 0.5 and 3 ppm — but OSHA's PEL is 5 ppm 8-hour TWA, and NIOSH's REL is stricter at 2 ppm TWA plus 5 ppm STEL. The range where smell registers is the same range where you're already at or approaching the exposure limit.\u003c\/p\u003e\n\u003cp\u003eThat physiology has one operational implication for SO2 monitoring: smell is NOT a reliable early-warning backup when the monitor drifts. Unlike H2S (which registers as rotten-egg smell well below the exposure limit and provides some sensory redundancy), SO2 gives workers a warning only AT the compliance threshold, not below it. If the SO2 sensor drifts high and no longer alarms at 2 ppm or 5 ppm, workers won't feel a substitute warning until they're already breathing at or above the PEL.\u003c\/p\u003e\n\u003cp\u003eProactive sensor replacement is worth the discipline for SO2 more than for gases where sensory backup provides real cover.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-S myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement — the sensor cell is accessed through the monitor's service compartment, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a full calibration to verify the new sensor's response against a known SO2 standard.\u003c\/p\u003e\n\u003cp\u003eIf you'd rather not run the swap yourself, or if you want a factory-trained technician to verify the sensor's performance across its full range before it goes back into service, send the monitor to PK Safety. We handle the swap, full calibration verification, and return-to-service in-house.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-S monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-S sensor cell costs $180 — slightly higher than the other RPL sensors in the WatchGas SST line ($160 baseline) because the sulfur-tolerant electrochemical cell is a premium component. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-so2-gas-detector-sst1-s\"\u003eSST1-S monitor\u003c\/a\u003e costs $290. Sensor swap saves you $110 vs. a full new monitor — roughly 62% of the full-monitor price for the maintenance action.\u003c\/p\u003e\n\u003cp\u003eThe sensor replacement is the more cost-effective path when your monitor's housing, display, battery, and electronics are in good working order and only the SO2 sensor has drifted. The full-monitor replacement is a better fit when the monitor itself is aging, has physical damage, or has a battery that no longer holds charge. Call PK Safety at 800.829.9580 with your monitor's condition and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is the SST-SPARE-S calibrated after installation?\u003c\/summary\u003e\n\u003cp\u003eAfter installing the new sensor cell in the monitor, run a full calibration cycle using an SO2 calibration gas standard — typically 10 ppm SO2 in nitrogen or air balance. Sulfur dioxide cal gas is corrosive and reactive, so use a stainless-steel or nickel-plated regulator (not brass) and dedicated Teflon or Tygon tubing that won't degrade over time.\u003c\/p\u003e\n\u003cp\u003eAutomated calibration is fastest using the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eWatchGas SST-DOCK Touchscreen docking station\u003c\/a\u003e — one docking cycle handles bump test and full calibration in about 60 seconds. Manual calibration through the monitor's menu also works.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether your SST4 has an SO2 sensor slot, or whether a swap or full monitor replacement is the right path? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST platform's service ecosystem will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728058735,"sku":"WG01-SST-SPARE-S","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-S---Watchgas-SST-sensor-SO2-0-50ppm-for-all---1---K1E800x800compressed.jpg?v=1771008066"},{"product_id":"watchgas-sst1-replacement-ph3-sensor-sst-spare-p","title":"WatchGas SST1 Replacement PH3 Sensor SST-SPARE-P","description":"\u003cp\u003e\u003cstrong\u003eWhen your PH3 sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement PH3 Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-ph3-gas-detector-sst1-p\"\u003eWatchGas SST1-P Serviceable PH3 Gas Detector\u003c\/a\u003e and any WatchGas SST4-series multi-gas monitor configured with a PH3 sensor slot.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePhosphine is one of the most toxic gases in the industrial catalog — and its smell arrives too late to help.\u003c\/strong\u003e OSHA's permissible exposure limit for phosphine is 0.3 ppm 8-hour TWA — three tenths of a part per million. ACGIH's TLV goes even stricter at 0.05 ppm. Workers can smell PH3 as a garlic or decaying-fish odor, but the detection threshold is 1–3 ppm — three to ten times the OSHA PEL. By the time you smell phosphine, you're already at multiples of the compliance limit and heading toward acute toxicity. Sub-ppm sensor precision is the entire point of PH3 monitoring. A drifting phosphine sensor doesn't just miss an alarm event; it means workers may be at multiples of the PEL before anyone knows anything is wrong.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement PH3 (phosphine) electrochemical sensor cell for the serviceable SST1-P monitor and any WatchGas SST4-series multi-gas monitor custom-configured with a PH3 sensor slot. Note that the SST4 platform's \u003cem\u003estandard\u003c\/em\u003e 4-gas sensor set is LEL\/O2\/CO\/H2S — PH3 is a specialty configuration on SST4 monitors, not the default.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003cli\u003eThe WatchGas SST1 line does NOT include Limited-Life (2-year or 3-year alert-only) monitors for phosphine, so there's no non-serviceable variant to exclude from compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eAbout the sensor:\u003c\/strong\u003e solid polymer electrochemical technology, 1-year sensor warranty. The 1-year warranty is shorter than the 2-year standard on most WatchGas SST replacement sensors — phosphine-tolerant electrochemical cells have shorter useful life across the industry because the cell chemistry is more susceptible to drift and cross-sensitivity, similar to the mercaptan sensors. Factor the shorter warranty into your fleet's replacement cadence.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace a phosphine sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events — especially at the sub-ppm concentrations where the OSHA PEL and ACGIH TLV live, precision is where drift matters most\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the PH3 channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (1 year) has elapsed. For phosphine monitoring in continuous-exposure environments (semiconductor fabs, active fumigation programs), proactive annual replacement is standard operating discipline.\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a defined cadence — for PH3 monitoring, this discipline is more critical than for higher-PEL gases because a drifting sensor at 0.3 ppm gives less margin for error than one at 20 ppm (H2S) or 50 ppm (CO).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-P:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-P serviceable phosphine monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eSemiconductor manufacturing operations — PH3 is a doping gas for silicon in III-V compound semiconductors, LED manufacturing, and photovoltaic cell production. Continuous monitoring at gas cabinets, delivery lines, and process tools.\u003c\/li\u003e\n\u003cli\u003eGrain and commodity fumigation operators — aluminum phosphide (AlP) and magnesium phosphide (Mg3P2) tablets release PH3 when exposed to moisture. Grain silos, warehouses, shipping containers, ship holds.\u003c\/li\u003e\n\u003cli\u003ePost-fumigation inspection crews who need continuous monitoring during aeration and re-entry\u003c\/li\u003e\n\u003cli\u003ePetroleum refinery operators at hydroprocessing units (PH3 is both a crude contaminant and a catalyst poison)\u003c\/li\u003e\n\u003cli\u003eRendering plants and biosolids-handling facilities with occasional PH3 generation from organic decomposition\u003c\/li\u003e\n\u003cli\u003eMetallurgy operations with specialty phosphine chemistry (some steel\/alloy processing)\u003c\/li\u003e\n\u003cli\u003eChemical manufacturing plants producing or handling phosphine or phosphine precursors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePH3 (phosphine)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e1 year\u003c\/td\u003e\n\u003ctd\u003eSST1-P, SST4-series (with PH3 sensor slot)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy at sub-ppm phosphine concentrations — critical for OSHA PEL (0.3 ppm) and ACGIH TLV (0.05 ppm) alignment\u003c\/li\u003e\n\u003cli\u003e1-year sensor warranty (specialty-cell chemistry)\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified phosphine standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your phosphine monitoring workflow with someone who understands the SST platform and specialty-gas monitoring.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-P — WatchGas Replacement PH3 (Phosphine) Sensor (1-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-P sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-P is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-ph3-gas-detector-sst1-p\"\u003eSST1-P Serviceable PH3 Gas Detector\u003c\/a\u003e — the single-gas phosphine monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003eWatchGas SST4-series multi-gas monitors \u003cstrong\u003eonly when custom-configured with a dedicated PH3 sensor slot\u003c\/strong\u003e (not the standard LEL\/O2\/CO\/H2S set)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePH3 is a specialty configuration on SST4 monitors, typically ordered for semiconductor manufacturing or fumigation applications. If your SST4 has the standard 4-gas set, this sensor won't fit. Call PK Safety at 800.829.9580 with your monitor's serial number to confirm your SST4's sensor slots.\u003c\/p\u003e\n\u003cp\u003eThe WatchGas SST1 catalog does not include Limited-Life (2-year or 3-year alert-only) monitors for phosphine — the SST1-P serviceable is the only PH3 monitor in the WatchGas SST catalog.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does phosphine sensor drift matter more than drift on other gases?\u003c\/summary\u003e\n\u003cp\u003eBecause phosphine's regulatory limits are extraordinarily strict, and the odor threshold sits above the exposure limit. Consider the numbers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOSHA PEL: 0.3 ppm\u003c\/strong\u003e 8-hour TWA — three tenths of a part per million, one of the strictest PELs in Table Z-1\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNIOSH REL: 0.3 ppm TWA + 1 ppm STEL\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eACGIH TLV: 0.05 ppm\u003c\/strong\u003e 8-hour TWA (2015 update) — six times stricter than OSHA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOdor detection threshold: 1–3 ppm\u003c\/strong\u003e (garlic \/ decaying-fish smell) — three to ten times the OSHA PEL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTwo operational implications: (1) sensor precision at sub-ppm concentrations is the entire point of PH3 monitoring — there's no margin for drift at these limits; (2) smell is NOT a reliable backup. By the time workers detect the garlic \/ decaying-fish odor, they're already at multiples of the OSHA PEL and heading toward acute toxicity. If the sensor drifts and doesn't alarm at 0.3 ppm, workers won't feel a substitute warning until they're at 1–3 ppm — well into the exposure zone.\u003c\/p\u003e\n\u003cp\u003eProactive sensor replacement at the 1-year warranty end is standard operating discipline for continuous-PH3 environments.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich industries use the SST1-P and this replacement sensor?\u003c\/summary\u003e\n\u003cp\u003ePhosphine monitoring is a specialty need across several industries:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSemiconductor manufacturing:\u003c\/strong\u003e PH3 is a doping gas for silicon in III-V compound semiconductors, LED manufacturing, and photovoltaic cell production. Continuous monitoring at gas cabinets, delivery lines, and process tools is standard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrain and commodity fumigation:\u003c\/strong\u003e aluminum phosphide (AlP) and magnesium phosphide (Mg3P2) tablets release phosphine gas when exposed to moisture. Used to fumigate grain silos, warehouses, shipping containers, and ship holds. Fumigation workers and post-fumigation inspection crews need continuous monitoring during and after the treatment cycle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetroleum refining:\u003c\/strong\u003e phosphine is both a crude contaminant and a catalyst poison in hydroprocessing units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRendering plants and biosolids handling:\u003c\/strong\u003e low-level PH3 generation from organic decomposition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetallurgy and chemical manufacturing:\u003c\/strong\u003e specialty phosphine chemistry in some processing applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is the SST-SPARE-P warranty only 1 year (vs 2 years on H2S \/ CO \/ O2 \/ SO2 \/ H2 sensors)?\u003c\/summary\u003e\n\u003cp\u003ePhosphine-tolerant electrochemical cells have shorter useful life across the safety industry — similar to methanethiol sensors (SST-MM-RPL is also a 1-year-warranty specialty sensor). The cell chemistry is more susceptible to drift and cross-sensitivity because phosphorus-containing compounds interact chemically with the electrochemical detection reaction.\u003c\/p\u003e\n\u003cp\u003eFactor the 1-year warranty into your fleet's replacement cadence. For continuous-phosphine environments (semiconductor fabs, active fumigation programs), 12-month proactive replacement is standard operating discipline; less-continuous exposure environments may run 12–18 months and calibrate frequently.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-P myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a full calibration to verify the new sensor's response against a known phosphine standard.\u003c\/p\u003e\n\u003cp\u003ePhosphine cal gas is a specialty item and requires special handling — typically 5 ppm PH3 in nitrogen balance, corrosive to some metals, and requires stainless-steel or nickel-plated regulators (not brass). If you don't have a phosphine cal workflow set up, sending the monitor to PK Safety for the swap and calibration verification is often the safer path. We stock the appropriate cal gas.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-P monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-P sensor cell costs $275. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-ph3-gas-detector-sst1-p\"\u003eSST1-P monitor\u003c\/a\u003e costs $420. Sensor swap saves $145 — about 65% of the full-monitor price for the maintenance action.\u003c\/p\u003e\n\u003cp\u003eThe sensor replacement is the more cost-effective path when your monitor's housing, display, battery, and electronics are in good working order. Full-monitor replacement is a better fit when the monitor itself is aging, has physical damage, or has a battery that no longer holds charge — and a full new monitor also comes with the 3-year instrument warranty on the electronics (not just the 1-year sensor warranty).\u003c\/p\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 with your monitor's condition and use pattern (semiconductor fab continuous monitoring vs intermittent fumigation vs occasional-exposure applications) and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether your SST4 has a PH3 sensor slot, or how to set up phosphine calibration for a swap? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows phosphine monitoring and the SST platform's service ecosystem will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728222575,"sku":"WG01-SST-SPARE-P","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-P---Watchgas-SST-sensor-PH3-0-20ppm-for-SST1-and-SST5---1---K1E800x800compressed.jpg?v=1771007911"},{"product_id":"watchgas-sst1-replacement-h2-high-sensor-sst-spare-h2hr","title":"WatchGas SST1 Replacement H2 High Sensor SST-SPARE-H2HR","description":"\u003cp\u003e\u003cstrong\u003eWhen your H2 sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement H2 High Range Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2-gas-detector-sst1-h2\"\u003eWatchGas SST1-H2 Serviceable H2 Gas Detector\u003c\/a\u003e configured for high-range hydrogen monitoring, extending the monitor's service life beyond the original sensor's lifespan.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis is the High Range variant of the WatchGas H2 sensor.\u003c\/strong\u003e It detects hydrogen across 0–20,000 ppm — that's 0–2% by volume in air, or up to 50% of the Lower Explosive Limit. Standard low-range H2 sensors saturate in environments with continuous H2 generation or ambient H2 concentrations above ~500 ppm. This sensor gives you accurate readings across the full ppm-through-percent detection window without over-ranging — the right choice for battery charging rooms with continuous H2 evolution, hydrogen fuel cell test stands, hydrogen production facilities, and refinery hydrogen recovery units.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHydrogen isn't a toxic exposure hazard. It's a fire and explosion hazard.\u003c\/strong\u003e Colorless, odorless, and lighter than air — hydrogen accumulates near ceilings, vents, and enclosed high points where workers can't smell or see it. Its flammable range in air runs from 4% (the Lower Explosive Limit) all the way to 75% — one of the widest flammable ranges of any industrial gas. Sensor drift on H2 doesn't mean a missed exposure event; it means the monitor may not alarm before the atmosphere reaches an ignitable concentration. For continuous-H2 environments, sensor accuracy across the full percent-level detection range is a fire-prevention input.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement High Range H2 electrochemical sensor cell (0–20,000 ppm detection window) for the serviceable SST1-H2 monitor configured for high-range hydrogen monitoring, and WatchGas SST4-series multi-gas monitors custom-configured with an H2 High Range sensor slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is DIFFERENT\u003c\/strong\u003e from the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-replacement-h2-sensor-sst-h2-rpl\"\u003estandard SST-H2-RPL\u003c\/a\u003e, which is a low-range H2 sensor for typical leak-detection applications. The standard sensor saturates well before this High Range sensor's ceiling. Use this sensor for continuous-H2 environments; use the standard sensor for intermittent-leak-detection environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e the same as an LEL sensor. Catalytic bead LEL sensors in SST4-family monitors detect hydrogen as one combustible gas among many but report readings as % LEL of a calibrated gas (typically methane) — not as a specific H2 concentration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003cli\u003eThe WatchGas SST1 line does NOT include Limited-Life alert-only monitors for hydrogen — so there's no non-serviceable variant to exclude from compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSolid polymer electrochemical sensor technology.\u003c\/strong\u003e The dry-cell design eliminates the liquid electrolyte used in traditional electrochemical sensors, giving the cell better long-term stability, no leak risk in truck-bed or field storage, and better tolerance for temperature extremes. Ultra-low power consumption compared to older H2 sensor designs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an H2 High Range sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the H2 channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed and calibration reliability starts trending down\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence — especially valuable in continuous-H2 environments where sensor drift silently defeats percent-level accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-H2HR:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBattery manufacturing operations and industrial-scale battery charging rooms (continuous H2 evolution requires percent-level detection)\u003c\/li\u003e\n\u003cli\u003eHydrogen fuel cell manufacturers running test stands at operating pressures (H2 concentrations can reach percent levels during testing)\u003c\/li\u003e\n\u003cli\u003eHydrogen production facilities (electrolysis plants, steam methane reforming, hydrogen recovery units)\u003c\/li\u003e\n\u003cli\u003ePetroleum refining hydrogen recovery and hydrotreating operators (where H2 is a process gas at percent-level concentrations)\u003c\/li\u003e\n\u003cli\u003eSemiconductor fabrication CVD chambers using H2 as a process gas\u003c\/li\u003e\n\u003cli\u003eAerospace propellant handling facilities (H2 as rocket propellant)\u003c\/li\u003e\n\u003cli\u003eMetallurgy operations with H2-rich annealing atmospheres\u003c\/li\u003e\n\u003cli\u003eNuclear power plants monitoring H2 buildup in containment vessels post-accident\u003c\/li\u003e\n\u003cli\u003eHydrogen-fueled vehicle refueling stations (where refueling operations can produce brief high-concentration exposures)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eRange\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH2 (hydrogen, High Range)\u003c\/td\u003e\n\u003ctd\u003e0–20,000 ppm (0–2% \/ 0–50% LEL)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eSST1-H2 (high-range configuration), SST4-series (with H-HR sensor slot)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the 0–20,000 ppm detection range — no saturation in continuous-H2 environments\u003c\/li\u003e\n\u003cli\u003e2-year sensor warranty\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the extended detection range\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified high-range H2 standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your continuous-hydrogen monitoring workflow with someone who understands the SST platform.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-H2HR — WatchGas Replacement H2 High Range Sensor, 0–20,000 ppm (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat's the difference between the SST-SPARE-H2HR and the standard SST-H2-RPL?\u003c\/summary\u003e\n\u003cp\u003eDetection range. Both sensors detect hydrogen using the same solid polymer electrochemical technology, both carry 2-year warranties, and both cost the same ($275). What differs is how much H2 they can measure without saturating:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-replacement-h2-sensor-sst-h2-rpl\"\u003eSST-H2-RPL (standard, low-range):\u003c\/a\u003e\u003c\/strong\u003e designed for typical H2 leak detection at low ppm concentrations. Alarms well below the 4% LEL threshold. Right for intermittent-H2 environments where the goal is early leak warning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSST-SPARE-H2HR (this sensor, High Range):\u003c\/strong\u003e designed for continuous-H2 environments where the atmosphere routinely contains meaningful H2 concentrations. 0–20,000 ppm detection range (0–2% H2, or 0–50% LEL). Provides percent-level accuracy where the low-range sensor would saturate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure which you need? If your monitor is deployed in a battery charging room, fuel cell test stand, hydrogen production or recovery facility, or any environment where H2 is a continuous process gas, this High Range sensor is likely the right choice. If your monitor is a general leak-detection instrument, the standard SST-H2-RPL is the right choice. Call PK Safety at 800.829.9580 to walk through your application.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-H2HR sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-H2HR is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWatchGas \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2-gas-detector-sst1-h2\"\u003eSST1-H2 Serviceable H2 Gas Detector\u003c\/a\u003e configured for high-range hydrogen monitoring — the SST1-H2 monitor accepts either the standard-range or high-range H2 sensor, but the configuration must match the sensor's range\u003c\/li\u003e\n\u003cli\u003eWatchGas SST4-series multi-gas monitors \u003cstrong\u003eonly when custom-configured with a dedicated H2 High Range sensor slot\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're unsure whether your SST1-H2 monitor is configured for standard or high-range H2 detection, call PK Safety at 800.829.9580 with your monitor's serial number — we can look up the configuration from the WatchGas manufacturing record.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is hydrogen monitored for fire and explosion instead of toxicity?\u003c\/summary\u003e\n\u003cp\u003eHydrogen isn't a toxic exposure hazard. It has no OSHA PEL or NIOSH REL because it's not toxic at concentrations workers would encounter. Monitoring is for flammable-atmosphere detection:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlammable range: 4–75%\u003c\/strong\u003e in air — one of the widest of any industrial gas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum ignition energy: 0.019 mJ\u003c\/strong\u003e — extremely low; static-electricity discharge from clothing can be enough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutoignition: ~1,076°F (580°C)\u003c\/strong\u003e — hot surfaces (steam pipes, motors, heaters) can serve as ignition sources without a spark\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eH2 monitors alarm well below the 4% LEL threshold — typically 10–25% of LEL (0.4–1% H2 \/ 4,000–10,000 ppm) — to give crews time to evacuate and ventilate before the atmosphere becomes ignitable. NFPA 55, NFPA 2, and NFPA 505 (industrial battery charging rooms) govern hydrogen safety in various industrial contexts.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I know it's time to replace my H2 High Range sensor?\u003c\/summary\u003e\n\u003cp\u003eFour common signals:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor fails a bump test\u003c\/strong\u003e and won't recover after recalibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration drift exceeds acceptable tolerance\u003c\/strong\u003e across successive cal events, especially at the high end of the detection range where accuracy matters most for percent-level monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe monitor displays a sensor fault code\u003c\/strong\u003e specific to the H2 channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor is out of its 2-year warranty period.\u003c\/strong\u003e Proactive replacement is standard operating discipline for continuous-H2 environments.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-H2HR myself?\u003c\/summary\u003e\n\u003cp\u003eYes — the SST1 platform is designed for user sensor replacement. After installation, complete a full calibration using a certified H2 High Range calibration gas. High-range H2 cal gas (typically 1% or 2% H2 in nitrogen balance) is a specialty item and requires special handling because 2% H2 sits at 50% of LEL — it's not flammable in the cylinder (nitrogen balance) but becomes an ignition concern if released to a confined space with air.\u003c\/p\u003e\n\u003cp\u003eIf you don't have a high-range H2 cal workflow set up, sending the monitor to PK Safety for the swap and calibration verification is the safer path. We stock the appropriate cal gas.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-H2 monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-H2HR sensor cell costs $275. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2-gas-detector-sst1-h2\"\u003eSST1-H2 monitor\u003c\/a\u003e costs $420. Sensor swap saves $145 — about 65% of the full-monitor price for the maintenance action.\u003c\/p\u003e\n\u003cp\u003eThe sensor replacement is the more cost-effective path when your monitor's housing, display, battery, and electronics are in good working order. Full-monitor replacement is a better fit when the monitor itself is aging, has physical damage, or has a battery no longer holding charge. Call PK Safety at 800.829.9580 with your monitor's condition.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether your SST1-H2 is configured for standard or high-range H2, or which sensor variant to order? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows hydrogen monitoring and the SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728288111,"sku":"WG01-SST-SPARE-H2HR","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-H2HR---1---K1E800x800compressed.jpg?v=1771007961"},{"product_id":"watchgas-sst1-replacement-ch4s-sensor-sst-spare-mm","title":"WatchGas SST1 Replacement CH4S Sensor SST-SPARE-MM","description":"\u003cp\u003e\u003cstrong\u003eWhen your methanethiol sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement CH4S Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-ch4s-gas-detector-sst1-mm\"\u003eWatchGas SST1-MM Serviceable CH4S Gas Detector\u003c\/a\u003e and any WatchGas SST4-series multi-gas monitor configured with a CH4S sensor slot.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eYou can smell methanethiol before you can measure it — but you probably can't smell it accurately for long.\u003c\/strong\u003e Mercaptans are one of the gases most likely to cause olfactory fatigue: the nose adapts within minutes, and the same worker who alarmed at the smell 20 minutes ago may not notice steady exposure now. And in mixed industrial environments — natural gas processing, wastewater digesters, Kraft pulping, animal agriculture — the smell often gets misattributed to a natural gas leak rather than the specific methanethiol exposure a monitor would quantify. Sensor accuracy at the ceiling limits (OSHA 10 ppm, NIOSH 0.5 ppm) is what determines whether the monitor catches drift the nose is missing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement CH4S (methanethiol \/ methyl mercaptan) electrochemical sensor cell for the serviceable SST1-MM monitor and any WatchGas SST4-series multi-gas monitor configured with a CH4S sensor slot. Note that the SST4 platform's \u003cem\u003estandard\u003c\/em\u003e 4-gas sensor set is LEL\/O2\/CO\/H2S — CH4S is a custom configuration on SST4 monitors, not the default.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003cli\u003eThe WatchGas SST1 line does NOT include Limited-Life (2-year or 3-year alert-only) monitors for methanethiol, so — unlike H2S, CO, and O2 replacement sensors — there's no non-serviceable variant to exclude from the compatibility list.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eAbout the sensor:\u003c\/strong\u003e solid polymer electrochemical technology, 0–100 ppm detection range, 1-year sensor warranty. The 1-year warranty is shorter than the 2-year standard on other WatchGas SST replacement sensors — mercaptan-tolerant electrochemical cells have shorter useful life across the industry because the cell chemistry is more susceptible to drift and cross-sensitivity with structurally similar sulfur compounds. Factor the shorter warranty into your fleet's replacement cadence.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace a methanethiol sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events, especially at the low ppm range where the NIOSH ceiling sits\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the CH4S channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (1 year) has elapsed — for mercaptan sensors, proactive replacement at warranty end is often the right call given the shorter useful life\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence — especially valuable in continuous-mercaptan environments (odorization plants, Kraft mills, biosolids digesters) where sensor drift can silently miss exposure events\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-MM:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-MM serviceable methanethiol monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eNatural gas processing and odorization plant operators (methanethiol is added to natural gas as a safety odorant — accurate on-site monitoring at odorization stations is a chronic requirement)\u003c\/li\u003e\n\u003cli\u003ePetroleum refinery operators handling sour crude with thiol contaminants, or running mercaptan-removal units\u003c\/li\u003e\n\u003cli\u003eKraft pulp and paper mill supervisors (methanethiol is a Kraft process byproduct alongside H2S and dimethyl sulfides)\u003c\/li\u003e\n\u003cli\u003eWastewater treatment operators, especially at biosolids digesters and downwind of digester emissions\u003c\/li\u003e\n\u003cli\u003eAnimal agriculture facility managers (dairy and hog operations) with community-emissions exposure concerns\u003c\/li\u003e\n\u003cli\u003eLandfill operators with active gas capture and flaring systems\u003c\/li\u003e\n\u003cli\u003eRendering plants and other biological-waste-processing facilities\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eRange\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCH4S (methanethiol \/ methyl mercaptan)\u003c\/td\u003e\n\u003ctd\u003e0–100 ppm\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e1 year\u003c\/td\u003e\n\u003ctd\u003eSST1-MM, SST4-series (with CH4S sensor slot)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the 0–100 ppm detection range\u003c\/li\u003e\n\u003cli\u003e1-year operational warranty (specialty-cell chemistry)\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eHigh precision at low methanethiol concentrations — critical for NIOSH REL-aligned monitoring (0.5 ppm ceiling)\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified methanethiol standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your methanethiol sensor replacement workflow with someone who understands the SST platform and specialty gas monitoring.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-MM — WatchGas Replacement CH4S (Methanethiol) Sensor (1-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-MM sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-MM is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-ch4s-gas-detector-sst1-mm\"\u003eSST1-MM Serviceable CH4S Gas Detector\u003c\/a\u003e — the single-gas methanethiol monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003eWatchGas SST4-series multi-gas monitors \u003cstrong\u003eonly when custom-configured with a CH4S sensor slot\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SST4 platform's \u003cem\u003estandard\u003c\/em\u003e 4-gas sensor set is LEL\/O2\/CO\/H2S. CH4S is a specialty configuration — usually ordered for Kraft mill or natural-gas-odorization work where methanethiol monitoring is a primary requirement. If your SST4 has the standard config, this sensor won't fit. Call PK Safety at 800.829.9580 with your monitor's serial number to confirm your SST4's sensor slots.\u003c\/p\u003e\n\u003cp\u003eUnlike H2S, CO, and O2, there's no Limited-Life (2-year or 3-year alert-only) methanethiol monitor in the SST1 line to exclude from compatibility — the SST1-MM serviceable is the only methanethiol monitor in the WatchGas SST catalog.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is the SST-SPARE-MM priced higher than the other RPL sensors?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-MM is $300 — compared to $160 for the H2S, CO, O2, H2, and PH3 replacement sensors, and $180 for the SO2 sensor. Two reasons:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialty cell chemistry.\u003c\/strong\u003e Methanethiol is a reactive sulfur compound. Building an electrochemical cell that responds accurately to CH4S without cross-sensitivity to H2S, dimethyl sulfide, dimethyl disulfide, and other structurally similar mercaptans present in Kraft mills, refineries, and wastewater digesters requires more specialized materials and manufacturing than a standard toxic-gas sensor. The unit cost reflects that.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower-volume production.\u003c\/strong\u003e Methanethiol monitoring is a specialty need across the safety industry — many fewer sensors are produced per year than for H2S or CO. Lower volume means higher per-unit cost.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eCompared to a full new SST1-MM monitor at $460, the $300 sensor swap still saves you $160 (about 35% of the full-monitor price) — meaningful in a fleet context.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy is the SST-SPARE-MM warranty only 1 year (vs 2 years on other RPL sensors)?\u003c\/summary\u003e\n\u003cp\u003eMercaptan-tolerant electrochemical cells have shorter useful life across the safety industry — not a WatchGas defect. The cell chemistry is more susceptible to drift and cross-sensitivity because sulfur-containing compounds are chemically reactive and the sensor is designed to detect them without over-responding to similar sulfur species.\u003c\/p\u003e\n\u003cp\u003eFactor the 1-year warranty into your fleet's replacement cadence. For continuous-methanethiol environments (odorization plants, Kraft mills, biosolids digesters), a 12-month proactive replacement schedule is a reasonable default; less-continuous exposure environments may run the sensor 12–18 months and calibrate frequently.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I detect methanethiol by smell instead of relying on the sensor?\u003c\/summary\u003e\n\u003cp\u003eMethanethiol is one of the most-smellable gases in industrial hygiene — detectable at parts per billion, far below both OSHA's 10 ppm ceiling and NIOSH's 0.5 ppm ceiling. So workers absolutely CAN smell it before the exposure limit. But there are three practical problems with relying on smell:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1. Olfactory fatigue.\u003c\/strong\u003e Mercaptans are one of the gases most likely to cause the nose to adapt within minutes. A worker who smelled it strongly on entry may not notice continued exposure 20 minutes later.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Odorant misattribution.\u003c\/strong\u003e Methanethiol is added to natural gas as a safety odorant. Workers in natural-gas-adjacent environments may perceive a methanethiol smell as \"a natural gas leak somewhere\" rather than a specific methanethiol exposure they need to measure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Ceiling-limit dynamics.\u003c\/strong\u003e Both OSHA and NIOSH set CEILING limits for methanethiol (not TWAs). That means exposure at the limit is a compliance failure the instant it happens — not something you average across an 8-hour shift. A monitor gives you the ppm reading; smell doesn't.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-MM myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement — the sensor cell is accessed through the monitor's service compartment, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a full calibration to verify the new sensor's response against a known methanethiol standard.\u003c\/p\u003e\n\u003cp\u003eMethanethiol cal gas is a specialty item — corrosive, reactive, and typically not held on-site outside of specialty-gas-monitoring facilities. If you don't have methanethiol cal gas in your calibration workflow, sending the monitor to PK Safety for the swap and calibration verification is often the more practical path. We stock the appropriate cal gas and can verify the sensor's response before returning the monitor to service.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-MM monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-MM sensor cell costs $300. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-ch4s-gas-detector-sst1-mm\"\u003eSST1-MM monitor\u003c\/a\u003e costs $460. Sensor swap saves you $160 — about 35% of the full-monitor price for the maintenance action.\u003c\/p\u003e\n\u003cp\u003eThe sensor replacement is the more cost-effective path when your monitor's housing, display, battery, and electronics are in good working order. Full-monitor replacement makes more sense when the monitor itself is aging, has physical damage, or has a battery no longer holding charge — and a full new monitor also comes with the 3-year instrument warranty on the electronics (not just the sensor).\u003c\/p\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 with your monitor's condition and use pattern (continuous vs. intermittent methanethiol environment) and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether your SST4 has a CH4S sensor slot, or whether a sensor swap or full monitor replacement is the right path? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows methanethiol monitoring and the SST platform's service ecosystem will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728320879,"sku":"WG01-SST-SPARE-MM","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/ES1-CH4S-800x800compressed.jpg?v=1771008669"},{"product_id":"watchgas-sst4-micro-replacement-lpc-lel-sensor-sst-spare-x1","title":"WatchGas SST4-MICRO Replacement LPC LEL Sensor SST-SPARE-X1","description":"\u003cp\u003e\u003cstrong\u003eWhen your LEL sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST4 line. Traditional 4-gas monitors have soldered-in sensors — when the LEL channel fails a bump test or reaches end-of-life, the whole monitor gets discarded. The SST4 platform is designed to be maintained: this WatchGas Replacement LPC LEL Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eWatchGas SST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAn LEL sensor is the fire channel of a 4-gas monitor.\u003c\/strong\u003e It doesn't measure toxicity — it measures how close the atmosphere is to being ignitable. OSHA's permit-required confined space rule (29 CFR 1910.146) makes this concrete: workers must retrieve at 10% LEL and evacuate at 100% LEL. A drifting LEL sensor doesn't just miss an alarm; it means the crew's early-warning line between \"atmosphere is safe\" and \"atmosphere can ignite\" isn't where the display says it is. For hot work, tank entry, sewer entry, and any confined-space program, LEL sensor integrity is the fire-and-explosion floor of the entire monitoring workflow.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement LPC (Low Power Consumption) combustible-gas sensor cell for the WatchGas SST4-MICRO diffusion 4-gas monitor. LPC is a MEMS-style pellistor optimized for the battery-operated compact form factor of the MICRO.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the WatchGas SST4-MINI or the WatchGas SST4-PUMP. Those larger monitors use different LEL sensor cells — see the compatibility table below to self-select the correct X-variant for your monitor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST4-MICRO monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWatchGas SST4 LEL sensor family — self-select the correct variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitor(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-SPARE-X1 \u003cem\u003e(this SKU)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-MICRO only\u003c\/td\u003e\n\u003ctd\u003eBattery-first compact diffusion monitoring; light-hydrocarbon response\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X2-RPL\u003c\/td\u003e\n\u003ctd\u003eCAT (Catalytic bead \/ pellistor)\u003c\/td\u003e\n\u003ctd\u003eSST4-MINI + SST4-PUMP\u003c\/td\u003e\n\u003ctd\u003eTraditional broad-spectrum combustible-gas response\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X3-RPL\u003c\/td\u003e\n\u003ctd\u003eNDIR (Non-Dispersive Infrared)\u003c\/td\u003e\n\u003ctd\u003eSST4-MINI + SST4-PUMP\u003c\/td\u003e\n\u003ctd\u003ePoisoning-resistant methane and hydrocarbon monitoring; works in low-oxygen atmospheres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X4-RPL\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-PUMP only\u003c\/td\u003e\n\u003ctd\u003eBattery-first pump-drawn sampling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you're not certain which SST4 model you own, look at the label on the back of the monitor or the invoice — MICRO \/ MINI \/ PUMP is called out in the product name. Or call PK Safety at 800.829.9580 with the serial number and we'll confirm.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAbout this sensor (LPC \/ MEMS pellistor):\u003c\/strong\u003e the LPC design is a MEMS-style pellistor optimized for the SST4-MICRO's compact battery-operated diffusion form factor. Fast response to light hydrocarbons (methane, propane, butane, natural gas), low power draw, and mechanical robustness against physical shock — all engineered for portable monitoring in field-service and confined-space contexts. Standard 2-year sensor warranty (matching the WatchGas baseline for H2S, CO, and O2 replacement sensors).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an LEL sensor:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds tolerance across successive cal events — with LEL, this often shows up as span-gas response falling short of the expected reading (e.g., a 50% LEL cal gas reads at 40% or lower)\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the LEL channel\u003c\/li\u003e\n\u003cli\u003eThe sensor has been exposed to a known pellistor poison (silicone-containing sealant, grease, or lubricant; H2S; halogen compounds; tetraethyl lead) even if it appears to still respond — poisoning damage is often permanent and progressive\u003c\/li\u003e\n\u003cli\u003eThe sensor has been exposed to a combustible atmosphere above its measurement range (\u0026gt;100% LEL) — pellistor cells can be thermally damaged by over-range exposure and may not recover\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed. For confined-space entry programs and hot-work permits, proactive replacement on a defined cadence is standard operating discipline\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a defined cadence for compliance documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-X1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST4-MICRO whose current LEL sensor has drifted, failed a bump, been exposed to a pellistor poison, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eOil \u0026amp; gas field service and production operators running LEL monitoring at wellheads, tank batteries, and confined spaces\u003c\/li\u003e\n\u003cli\u003eRefinery and petrochemical plant maintenance and turnaround crews — hot-work permits, tank entry, unit shutdowns\u003c\/li\u003e\n\u003cli\u003eNatural gas utility and pipeline field crews — distribution work, meter sets, service repairs, leak surveys\u003c\/li\u003e\n\u003cli\u003eWastewater treatment operators — methane (digester gas) monitoring in wet wells, headworks, and confined spaces\u003c\/li\u003e\n\u003cli\u003eConfined-space entry contractors — utility (sewer, water, telecom vaults), industrial, marine, tank cleaning\u003c\/li\u003e\n\u003cli\u003eLandfill and biogas operators — methane monitoring in gas collection systems\u003c\/li\u003e\n\u003cli\u003eBrewery, distillery, and fermentation facilities — ethanol vapor monitoring in cellars and process areas\u003c\/li\u003e\n\u003cli\u003eCannabis extraction facilities — butane, propane, and ethanol vapor monitoring in extraction rooms\u003c\/li\u003e\n\u003cli\u003ePainting, coatings, and print shops — solvent vapor monitoring where LEL accumulation is possible\u003c\/li\u003e\n\u003cli\u003eMarine vessel interior spaces — cargo holds, engine rooms, ballast tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible gas (0–100% LEL)\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption pellistor, MEMS-style)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eWatchGas SST4-MICRO Diffusion 4-Gas Detector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFast response time for light hydrocarbons (methane, propane, butane, natural gas)\u003c\/li\u003e\n\u003cli\u003eMechanical robustness — MEMS design resistant to impact shock (a common failure mode for traditional catalytic bead pellistors in field-service use)\u003c\/li\u003e\n\u003cli\u003eLow power consumption — optimized for the SST4-MICRO's battery-operated diffusion form factor\u003c\/li\u003e\n\u003cli\u003e2-year sensor warranty (baseline for WatchGas SST replacement sensors)\u003c\/li\u003e\n\u003cli\u003eCost-effective replacement path — $520 less than full SST4-MICRO monitor replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for LEL sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against certified methane or pentane span gas, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's LEL sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your confined-space or hot-work monitoring workflow with someone who understands the SST platform and LEL calibration.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST4):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST4-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST4 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-X1 — WatchGas Replacement LPC LEL Sensor for SST4-MICRO (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-X1 compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X1 is compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eWatchGas SST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e ONLY.\u003c\/p\u003e\n\u003cp\u003eIt is NOT compatible with the SST4-MINI or the SST4-PUMP. Those monitors use different LEL sensor cells:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSST4-MINI:\u003c\/strong\u003e use SST-X2-RPL (CAT \/ catalytic bead) or SST-X3-RPL (NDIR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSST4-PUMP:\u003c\/strong\u003e use SST-X2-RPL (CAT), SST-X3-RPL (NDIR), or SST-X4-RPL (LPC configured for the PUMP form factor)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're not certain which monitor you own, look at the label on the back or the invoice — MICRO \/ MINI \/ PUMP is called out in the product name. Or call PK Safety at 800.829.9580 with the serial number and we'll confirm which X-variant fits.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is LEL monitoring different from toxic-gas monitoring — and why does the sensor matter?\u003c\/summary\u003e\n\u003cp\u003eToxic-gas sensors (H2S, CO, O2) protect against exposure — the alarm setpoints are anchored to permissible exposure limits like OSHA PELs or NIOSH RELs, and the concentrations of concern are typically parts per million.\u003c\/p\u003e\n\u003cp\u003eLEL sensors protect against fire and explosion. The scale is 0–100% LEL, where 100% LEL means the atmosphere has reached the lower flammable limit and is now ignitable given a spark or heat source. The concentrations are much higher than toxic thresholds — methane at 100% LEL is about 5% by volume, or 50,000 ppm.\u003c\/p\u003e\n\u003cp\u003eOSHA's permit-required confined space rule (29 CFR 1910.146) draws two hard lines: workers must retrieve at 10% LEL, and evacuate at 100% LEL. A drifting LEL sensor means those hard lines are being drawn in the wrong place. The consequence isn't a delayed alarm on a slowly-escalating exposure — it's the difference between exiting a confined space safely and being inside when an atmosphere becomes ignitable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat causes an LEL sensor to fail or drift?\u003c\/summary\u003e\n\u003cp\u003eThe most common LEL sensor failure modes for pellistor cells (including the LPC variant in the SST-SPARE-X1):\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilicone poisoning\u003c\/strong\u003e — the classic pellistor killer. Silicones from RTV sealants, greases, lubricants, some hand creams and hair products, and industrial mold-release agents deposit on the pellistor bead and reduce its catalytic activity. Damage is progressive and typically permanent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSulfur compound poisoning (H2S, mercaptans)\u003c\/strong\u003e — common concern in oil \u0026amp; gas and wastewater environments where H2S is often present alongside methane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalogen poisoning\u003c\/strong\u003e — chlorinated solvents, refrigerants, and other halogenated compounds can inhibit pellistor response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-range exposure\u003c\/strong\u003e — pellistor cells exposed to concentrations above 100% LEL can be thermally damaged by the exothermic reaction and may not recover full sensitivity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical shock\u003c\/strong\u003e — traditional catalytic bead pellistors can crack the bead structure under impact. The LPC MEMS design is engineered to be more shock-resistant than traditional pellistors, but it is not immune.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNormal wear\u003c\/strong\u003e — pellistor cells drift with cumulative use as the bead structure ages. This is why calibration cadence matters and why a 2-year warranty exists.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your SST4-MICRO has been used in an environment with silicone or sulfur exposure and the LEL channel is showing drift, poisoning is the most likely cause. A drift you can't recover with calibration is a replacement signal, not a re-calibration signal.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich industries use the SST4-MICRO and this replacement sensor?\u003c\/summary\u003e\n\u003cp\u003eLEL is the fire channel of a 4-gas monitor, so the SST4-MICRO buyer set is broad — anyone doing confined-space entry, hot-work permits, or general industrial atmosphere monitoring where combustible gas is a hazard.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; gas exploration, production, and field service\u003c\/strong\u003e — LEL monitoring at wellheads, tank batteries, and confined spaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetroleum refining and petrochemical plants\u003c\/strong\u003e — hot-work permits, tank entry, unit shutdowns and turnarounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural gas utilities and pipelines\u003c\/strong\u003e — distribution work, meter sets, service repairs, and leak surveys\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater treatment\u003c\/strong\u003e — methane (digester gas) monitoring in wet wells, headworks, and process confined spaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfined-space entry contractors\u003c\/strong\u003e — utility (sewer, water, telecom vaults), industrial, marine, tank cleaning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLandfill and biogas\u003c\/strong\u003e — methane monitoring in gas collection systems and around leachate infrastructure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrewery, distillery, and fermentation\u003c\/strong\u003e — ethanol vapor monitoring in cellars, tank rooms, and process areas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCannabis extraction\u003c\/strong\u003e — butane, propane, and ethanol vapor monitoring in closed-loop and open-blast extraction rooms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePainting, coatings, and print shops\u003c\/strong\u003e — solvent vapor monitoring where LEL accumulation is possible in spray booths or enclosed application areas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine vessel interior spaces\u003c\/strong\u003e — cargo holds, engine rooms, ballast tanks (per API RP 2016 and USCG confined-space guidance)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-X1 myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST4 platform is designed for user sensor replacement, and the WatchGas SST4-MICRO manual walks through the swap procedure. After installation, you must complete a full calibration to verify the new LEL sensor's response against a known span gas — typically 50% LEL methane (2.5% CH4 in air) or 50% LEL pentane, depending on your calibration protocol.\u003c\/p\u003e\n\u003cp\u003eLEL calibration is more straightforward than specialty-gas calibration (methane cal gas is standard, non-corrosive, and widely stocked), so DIY sensor swap is a realistic path if you have a functioning calibration workflow.\u003c\/p\u003e\n\u003cp\u003eIf you don't have LEL cal gas or a calibration station on hand — or you'd rather have the swap done by a factory-trained technician who verifies calibration against multiple LEL span points — sending the monitor to PK Safety is often the safer path. We handle the swap, cal gas, and return-to-service documentation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the LEL sensor or buy a new SST4-MICRO?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X1 sensor cell costs $160. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eSST4-MICRO monitor\u003c\/a\u003e starts at $680. Sensor swap saves $520 — about 76% of the full-monitor cost is preserved by the maintenance action.\u003c\/p\u003e\n\u003cp\u003eThat's the best sensor economics ratio in the entire WatchGas SST replacement-sensor catalog, because a 4-gas monitor carries the full electronics, display, battery, pump\/diffusion housing, and sensor manifold — an LEL cell alone represents only a fraction of that assembly.\u003c\/p\u003e\n\u003cp\u003eSensor replacement is the more cost-effective path when the monitor's housing, display, battery, and other three sensors (O2, CO, H2S) are in good working order. Full-monitor replacement is a better fit when the monitor itself is aging, has physical damage, has a battery that no longer holds charge, or has multiple sensors due for replacement — and a full new monitor comes with the 3-year instrument warranty on the electronics.\u003c\/p\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 with your monitor's condition and use pattern and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which X-variant fits your monitor, or how to set up methane calibration for a sensor swap? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST4 platform and LEL calibration workflows will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728386415,"sku":"WG01-SST-SPARE-X1","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-X1---Sensor---LPC-LEL-for-SST4-Micro---1---K1E800x800compressed.jpg?v=1771008045"},{"product_id":"watchgas-sst4-mini-sst4-pump-cat-lel-sensor-sst-spare-x2","title":"WatchGas SST4-MINI \u0026 SST4-PUMP CAT LEL Sensor SST-SPARE-X2","description":"\u003cp\u003e\u003cstrong\u003eWhen your LEL sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST4 line. This WatchGas Replacement CAT LEL Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e and the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e — when either is configured with a CAT (catalytic bead) LEL sensor.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAn LEL sensor is the fire channel of a 4-gas monitor.\u003c\/strong\u003e It doesn't measure toxicity — it measures how close the atmosphere is to being ignitable. OSHA's permit-required confined space rule (29 CFR 1910.146) draws this line concretely: workers must retrieve at 10% LEL and evacuate at 100% LEL. A drifting LEL sensor means those hard lines are being drawn in the wrong place. For hot work, tank entry, sewer entry, and any confined-space program, LEL sensor integrity is the fire-and-explosion floor of the entire monitoring workflow.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy CAT (catalytic bead) is the industry-standard broad-spectrum LEL detector — and what its trade-offs are:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe catalytic bead pellistor has been the LEL industry standard for decades. It responds broadly across essentially every combustible hydrocarbon (methane, propane, butane, natural gas, hexane, benzene, alcohols, and most solvents), calibrates predictably against methane or pentane span gas, and has the widest installed base of any LEL sensor tech in oil \u0026amp; gas, refining, and utility field service. If your operation runs on methane, propane, or a mix of common hydrocarbons and solvents, CAT is the well-understood choice.\u003c\/p\u003e\n\n\u003cp\u003eIts trade-off: pellistors are the LEL sensor type most vulnerable to poisoning. Silicones (RTV sealants, greases, hand creams and hair products with silicone, mold-release agents), sulfur compounds (H2S, mercaptans — common alongside methane in sour gas fields and wastewater), halogens (chlorinated solvents, refrigerants), and tetraethyl lead all deposit on the pellistor bead and reduce its catalytic activity. Damage is typically progressive and irreversible. If your monitoring environment contains these compounds, calibrate more aggressively — or consider upgrading to the NDIR variant (SST-X3-RPL), which is immune to those poisons and also works in oxygen-deficient atmospheres. See the FAQ below for the CAT-vs-NDIR upgrade-path decision.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement CAT (catalytic bead \/ pellistor) combustible-gas sensor cell for WatchGas SST4-MINI or SST4-PUMP monitors configured with a CAT LEL sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the SST4-MICRO (that monitor uses the smaller LPC MEMS pellistor — use SST-X1-RPL).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with SST4-MINI or SST4-PUMP monitors configured with the NDIR LEL sensor (use SST-X3-RPL instead) or the PUMP-specific LPC configuration (use SST-X4-RPL).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST4-series monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWatchGas SST4 LEL sensor family — self-select the correct variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitor(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X1-RPL\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-MICRO only\u003c\/td\u003e\n\u003ctd\u003eBattery-first compact diffusion monitoring; light-hydrocarbon response\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSST-SPARE-X2 \u003cem\u003e(this SKU)\u003c\/em\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCAT (Catalytic bead \/ pellistor)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSST4-MINI + SST4-PUMP\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eTraditional broad-spectrum combustible-gas response — industry-standard for methane, propane, and common hydrocarbon mixes\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X3-RPL\u003c\/td\u003e\n\u003ctd\u003eNDIR (Non-Dispersive Infrared)\u003c\/td\u003e\n\u003ctd\u003eSST4-MINI + SST4-PUMP\u003c\/td\u003e\n\u003ctd\u003ePoisoning-resistant methane and hydrocarbon monitoring; works in low-oxygen atmospheres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X4-RPL\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-PUMP only\u003c\/td\u003e\n\u003ctd\u003eBattery-first pump-drawn sampling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you're not certain which sensor tech your MINI or PUMP was configured with, check the invoice or product label, or call PK Safety at 800.829.9580 with the serial number and we'll confirm which X-variant fits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAbout this sensor (CAT \/ catalytic bead pellistor):\u003c\/strong\u003e the CAT design is the traditional catalytic-bead pellistor architecture that has anchored LEL monitoring since the mid-20th century. A catalytic bead and a reference bead sit in a Wheatstone bridge; when combustible gas contacts the catalyst-coated bead, it burns, heats the bead, and unbalances the bridge — producing the LEL reading. Broad-spectrum response across methane, propane, butane, natural gas, and most combustible hydrocarbons. Standard 2-year sensor warranty (matching the WatchGas baseline for H2S, CO, and O2 replacement sensors).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an LEL sensor:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds tolerance across successive cal events — with CAT pellistors, this often shows up as span-gas response falling short of expected (a 50% LEL methane cal reads 40% or lower), indicating catalytic activity loss\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the LEL channel\u003c\/li\u003e\n\u003cli\u003eThe sensor has been exposed to a known pellistor poison (silicone, H2S, halogens, tetraethyl lead) even if it appears to still respond — poisoning damage is progressive and permanent\u003c\/li\u003e\n\u003cli\u003eThe sensor has been exposed to a combustible atmosphere above its measurement range (\u0026gt;100% LEL) — pellistor cells can be thermally damaged by over-range exposure\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed. For confined-space entry programs and hot-work permits, proactive replacement on a defined cadence is standard operating discipline\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a defined cadence for compliance documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-X2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST4-MINI (X2 configuration) or SST4-PUMP (X2 configuration) whose current LEL sensor has drifted, failed a bump, been exposed to a pellistor poison, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eOil \u0026amp; gas field service and production operators using CAT-configured monitors at wellheads, tank batteries, and confined spaces\u003c\/li\u003e\n\u003cli\u003ePetroleum refining and petrochemical plant maintenance and turnaround crews — SST4-PUMP with CAT is common in tank entry and turnaround workflows where remote sampling is required\u003c\/li\u003e\n\u003cli\u003eNatural gas utility and pipeline field crews — methane monitoring in distribution work, meter sets, service repairs, leak surveys\u003c\/li\u003e\n\u003cli\u003eWastewater treatment operators — methane (digester gas) monitoring in wet wells, headworks, and confined spaces (be alert to H2S co-exposure poisoning risk)\u003c\/li\u003e\n\u003cli\u003eConfined-space entry contractors — utility (sewer, water, telecom vaults), industrial, marine, tank cleaning\u003c\/li\u003e\n\u003cli\u003eLandfill and biogas operators — methane monitoring in gas collection systems\u003c\/li\u003e\n\u003cli\u003eBrewery, distillery, and fermentation facilities — ethanol vapor monitoring in cellars, tank rooms, and process areas\u003c\/li\u003e\n\u003cli\u003ePainting, coatings, and print shops — solvent vapor monitoring (be alert to silicone-based mold-release agents that can poison CAT)\u003c\/li\u003e\n\u003cli\u003eMarine vessel interior spaces — cargo holds, engine rooms, ballast tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible gas (0–100% LEL)\u003c\/td\u003e\n\u003ctd\u003eCAT (Catalytic bead \/ pellistor)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eWatchGas SST4-MINI (X2 config) + SST4-PUMP (X2 config)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBroad-spectrum response across methane, propane, butane, natural gas, and most combustible hydrocarbons — the widest LEL response range of the four SST4 sensor variants\u003c\/li\u003e\n\u003cli\u003eIndustry-standard catalytic bead architecture — well-understood calibration behavior, predictable cross-sensitivity, extensive field track record\u003c\/li\u003e\n\u003cli\u003e2-year sensor warranty (baseline for WatchGas SST replacement sensors)\u003c\/li\u003e\n\u003cli\u003eCost-effective replacement path — $545 less than full SST4-MINI monitor replacement (even bigger savings vs SST4-PUMP)\u003c\/li\u003e\n\u003cli\u003eStandard cal gas: 50% LEL methane (2.5% CH4 in air) or 50% LEL pentane — widely stocked and non-corrosive\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for LEL sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against certified methane or pentane span gas, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's LEL sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your confined-space or hot-work monitoring workflow, or to discuss whether CAT or NDIR is the right sensor tech for your environment.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST4):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST4-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST4 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-X2 — WatchGas Replacement CAT LEL Sensor for SST4-MINI + SST4-PUMP (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-X2 compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X2 is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e — when configured with the X2 (CAT) LEL sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e — when configured with the X2 (CAT) LEL sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is NOT compatible with the SST4-MICRO (that monitor uses the smaller LPC MEMS pellistor — use SST-X1-RPL), or with MINI\/PUMP monitors configured with NDIR (use SST-X3-RPL) or PUMP-specific LPC (use SST-X4-RPL).\u003c\/p\u003e\n\u003cp\u003eIf you're not certain how your MINI or PUMP was configured, check the invoice or product label, or call PK Safety at 800.829.9580 with the serial number and we'll confirm which X-variant fits.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I stick with CAT or upgrade to NDIR (SST-X3-RPL) when I replace this sensor?\u003c\/summary\u003e\n\u003cp\u003eThis is a real technology-choice decision, not a marketing upsell. Both sensors work well in the right environment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStay with CAT (SST-SPARE-X2) if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour monitoring environment is clean — no silicones, minimal H2S, no halogens\u003c\/li\u003e\n\u003cli\u003eYou need broad-spectrum response across many different hydrocarbons (methane, propane, butane, natural gas, solvents, alcohols) — CAT covers the widest range\u003c\/li\u003e\n\u003cli\u003eYour calibration workflow uses methane or pentane span gas — both are standard for CAT\u003c\/li\u003e\n\u003cli\u003eYou want the industry-standard sensor tech with the longest field track record and predictable calibration behavior\u003c\/li\u003e\n\u003cli\u003eYou're primarily monitoring methane in oil \u0026amp; gas, natural gas utility, or wastewater digester applications without heavy H2S co-exposure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUpgrade to NDIR (SST-X3-RPL) if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour environment has silicones (RTV sealants, mold-release agents, silicone-heavy lubricants) — CAT poisoning is progressive and permanent\u003c\/li\u003e\n\u003cli\u003eYou work in sour gas (high H2S) oil \u0026amp; gas fields — CAT can be poisoned by sustained H2S exposure\u003c\/li\u003e\n\u003cli\u003eYou work around chlorinated solvents or refrigerants — halogens inhibit CAT response\u003c\/li\u003e\n\u003cli\u003eYou need LEL monitoring in oxygen-deficient atmospheres (below ~10% O2) — CAT requires oxygen to function; NDIR does not\u003c\/li\u003e\n\u003cli\u003eYou want to eliminate the pellistor-poisoning failure mode from your fleet entirely and are willing to trade broad-spectrum response (NDIR only detects IR-active hydrocarbons — methane, propane, natural gas) for poisoning immunity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 to talk through your specific environment. Note that upgrading from CAT to NDIR requires the correctly-configured monitor — you can't just drop the X3 sensor into a monitor built for X2 without WatchGas-side configuration.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is LEL monitoring different from toxic-gas monitoring — and why does the sensor matter?\u003c\/summary\u003e\n\u003cp\u003eToxic-gas sensors (H2S, CO, O2) protect against exposure — the alarm setpoints are anchored to permissible exposure limits like OSHA PELs or NIOSH RELs, and the concentrations of concern are typically parts per million.\u003c\/p\u003e\n\u003cp\u003eLEL sensors protect against fire and explosion. The scale is 0–100% LEL, where 100% LEL means the atmosphere has reached the lower flammable limit and is now ignitable given a spark or heat source. The concentrations are much higher than toxic thresholds — methane at 100% LEL is about 5% by volume, or 50,000 ppm.\u003c\/p\u003e\n\u003cp\u003eOSHA's permit-required confined space rule (29 CFR 1910.146) draws two hard lines: workers must retrieve at 10% LEL, and evacuate at 100% LEL. A drifting LEL sensor means those hard lines are being drawn in the wrong place. The consequence isn't a delayed alarm on a slowly-escalating exposure — it's the difference between exiting a confined space safely and being inside when an atmosphere becomes ignitable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat causes a CAT LEL sensor to fail or drift?\u003c\/summary\u003e\n\u003cp\u003eThe most common CAT LEL sensor failure modes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilicone poisoning\u003c\/strong\u003e — the classic pellistor killer. Silicones from RTV sealants, greases, lubricants, some hand creams and hair products, and industrial mold-release agents deposit on the catalytic bead and reduce its catalytic activity. Damage is progressive and typically permanent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSulfur compound poisoning (H2S, mercaptans)\u003c\/strong\u003e — common concern in oil \u0026amp; gas (especially sour gas fields), wastewater, and any environment where H2S is present alongside methane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalogen poisoning\u003c\/strong\u003e — chlorinated solvents, refrigerants, and other halogenated compounds can inhibit pellistor response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-range exposure\u003c\/strong\u003e — pellistor cells exposed to concentrations above 100% LEL can be thermally damaged by the exothermic reaction and may not recover full sensitivity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical shock\u003c\/strong\u003e — traditional catalytic bead pellistors can crack the bead structure under impact. The CAT variant in the SST-SPARE-X2 is a robust industrial-grade pellistor, but drops onto hard surfaces can still cause failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNormal wear\u003c\/strong\u003e — pellistor cells drift with cumulative use as the bead structure ages. This is why calibration cadence matters and why a 2-year warranty exists.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your monitor has been used in an environment with silicone, sulfur, or halogen exposure and the LEL channel is showing drift, poisoning is the most likely cause. A drift you can't recover with calibration is a replacement signal, not a re-calibration signal — and if the poisoning source is still present, consider whether NDIR (SST-X3-RPL) is a better long-term fit.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich industries use CAT-configured MINI and PUMP monitors?\u003c\/summary\u003e\n\u003cp\u003eCAT is the industry-standard LEL sensor for broad hydrocarbon response, so the SST4-MINI (X2 config) and SST4-PUMP (X2 config) buyer set is broad — anyone doing confined-space entry, hot-work permits, or general industrial atmosphere monitoring where a mix of combustible gases is possible.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; gas exploration, production, and field service\u003c\/strong\u003e — LEL monitoring at wellheads, tank batteries, and confined spaces (CAT is well-suited to sweet gas; consider NDIR for sour gas)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetroleum refining and petrochemical plants\u003c\/strong\u003e — hot-work permits, tank entry, unit shutdowns and turnarounds (SST4-PUMP with CAT is common for remote sampling in tank entry workflows)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural gas utilities and pipelines\u003c\/strong\u003e — distribution work, meter sets, service repairs, leak surveys\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater treatment\u003c\/strong\u003e — methane digester gas monitoring in wet wells, headworks, and process confined spaces (be alert to H2S co-exposure poisoning risk)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfined-space entry contractors\u003c\/strong\u003e — utility (sewer, water, telecom vaults), industrial, marine, tank cleaning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLandfill and biogas\u003c\/strong\u003e — methane monitoring in gas collection systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrewery, distillery, and fermentation\u003c\/strong\u003e — ethanol vapor monitoring in cellars, tank rooms, and process areas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePainting, coatings, and print shops\u003c\/strong\u003e — solvent vapor monitoring (be alert to silicone-based mold-release agents)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine vessel interior spaces\u003c\/strong\u003e — cargo holds, engine rooms, ballast tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-X2 myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST4 platform is designed for user sensor replacement, and the WatchGas SST4-MINI \/ SST4-PUMP manual walks through the swap procedure. After installation, you must complete a full calibration to verify the new LEL sensor's response against a known span gas — typically 50% LEL methane (2.5% CH4 in air) or 50% LEL pentane, depending on your calibration protocol.\u003c\/p\u003e\n\u003cp\u003eLEL calibration is more straightforward than specialty-gas calibration (methane cal gas is standard, non-corrosive, and widely stocked), so DIY sensor swap is a realistic path if you have a functioning calibration workflow.\u003c\/p\u003e\n\u003cp\u003eIf you don't have LEL cal gas or a calibration station on hand — or you'd rather have the swap done by a factory-trained technician who verifies calibration against multiple LEL span points — sending the monitor to PK Safety is often the safer path. We handle the swap, cal gas, and return-to-service documentation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the LEL sensor or buy a new SST4-MINI or SST4-PUMP?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X2 sensor cell costs $175. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI monitor\u003c\/a\u003e starts at $720; the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP\u003c\/a\u003e is higher. Sensor swap saves $545+ vs full-monitor replacement.\u003c\/p\u003e\n\u003cp\u003eSensor replacement is the more cost-effective path when the monitor's housing, display, battery, pump (on the PUMP variant), and other three sensors (O2, CO, H2S) are in good working order. Full-monitor replacement is a better fit when the monitor itself is aging, has physical damage, has a battery that no longer holds charge, or has multiple sensors due for replacement — and a full new monitor comes with the 3-year instrument warranty on the electronics.\u003c\/p\u003e\n\u003cp\u003eIf the reason you're replacing the LEL sensor is CAT poisoning by silicones, H2S, or halogens — and the poisoning source is still present in your environment — the right call may actually be an NDIR upgrade path (SST-X3-RPL) rather than another CAT sensor. Call PK Safety at 800.829.9580 to talk through the decision.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which X-variant fits your monitor, or whether CAT or NDIR is the right sensor tech for your environment? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST4 platform and LEL sensor technology trade-offs will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728484719,"sku":"WG01-SST-SPARE-X2","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-X2---Sensor---LEL-CAT-for-SST4-Mini_-Pump---1---K1E800x800compressed.jpg?v=1771008028"},{"product_id":"watchgas-sst4-mini-sst4-pump-ndir-lel-sensor-sst-spare-x3","title":"WatchGas SST4-MINI \u0026 SST4-PUMP NDIR LEL Sensor SST-SPARE-X3","description":"\u003cp\u003e\u003cstrong\u003eWhen your LEL sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST4 line. This WatchGas Replacement NDIR LEL Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e and the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e — when either is configured with an NDIR (Non-Dispersive Infrared) LEL sensor.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAn LEL sensor is the fire channel of a 4-gas monitor.\u003c\/strong\u003e It doesn't measure toxicity — it measures how close the atmosphere is to being ignitable. OSHA's permit-required confined space rule (29 CFR 1910.146) draws this line concretely: workers must retrieve at 10% LEL and evacuate at 100% LEL. A drifting LEL sensor means those hard lines are being drawn in the wrong place.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNDIR is the premium LEL sensor tech in the SST4 family — and the answer to every poisoning problem that ends a pellistor's life.\u003c\/strong\u003e If your monitor sits in a silicone-heavy environment, a sour-gas field (H2S alongside methane), a chlorinated-solvent workspace, or an oxygen-deficient atmosphere (inert-purged tanks, some pharmaceutical or specialty chemical processes), NDIR outlives, out-tolerates, and out-performs the catalytic bead (CAT) variant. Expected lifetime is 10 years — approximately five times a typical pellistor — with two-month battery runtime on the SST4 platform. The 2-year warranty is conservative; the sensor tech itself is engineered for a long service life.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe honest trade-off: NDIR detects only IR-active hydrocarbons.\u003c\/strong\u003e Methane, propane, butane, natural gas, and most heavier hydrocarbons — all detected reliably. Hydrogen is NOT detected (H2 is not infrared-active), and NDIR will miss some non-IR-active industrial solvents. If your monitoring workflow includes broad VOC exposure (varied solvent mixes, some cleaning chemistries) or hydrogen, the CAT variant (SST-X2-RPL) is the better choice. If your primary hazard is methane, propane, or a natural-gas \/ oil \u0026amp; gas hydrocarbon mix — especially in an environment where CAT poisoning is a documented risk — NDIR is a durability upgrade you'll notice across the fleet's service life.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement NDIR (Non-Dispersive Infrared) combustible-gas sensor cell for WatchGas SST4-MINI or SST4-PUMP monitors configured with an NDIR LEL sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the SST4-MICRO (that uses the LPC MEMS pellistor — use SST-X1-RPL).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with SST4-MINI or SST4-PUMP monitors configured with the CAT pellistor (use SST-X2-RPL) or the PUMP-specific LPC (use SST-X4-RPL).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a hydrogen sensor. Hydrogen is not IR-active; NDIR cannot detect it. WatchGas serves hydrogen monitoring via the separate SST1-H2 serviceable single-gas platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST4-series monitor to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWatchGas SST4 LEL sensor family — self-select the correct variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitor(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X1-RPL\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-MICRO only\u003c\/td\u003e\n\u003ctd\u003eBattery-first compact diffusion monitoring; light-hydrocarbon response\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X2-RPL\u003c\/td\u003e\n\u003ctd\u003eCAT (Catalytic bead \/ pellistor)\u003c\/td\u003e\n\u003ctd\u003eSST4-MINI + SST4-PUMP\u003c\/td\u003e\n\u003ctd\u003eTraditional broad-spectrum combustible-gas response — industry-standard for methane, propane, and common hydrocarbon mixes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSST-SPARE-X3 \u003cem\u003e(this SKU)\u003c\/em\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNDIR (Non-Dispersive Infrared)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSST4-MINI + SST4-PUMP\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePoisoning-immune, works in oxygen-deficient atmospheres, 10-year expected lifetime; methane and hydrocarbon monitoring in silicone- \/ sulfur- \/ halogen-exposed or inert environments\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X4-RPL\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-PUMP only\u003c\/td\u003e\n\u003ctd\u003eBattery-first pump-drawn sampling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you're not certain how your MINI or PUMP was configured, check the invoice or product label, or call PK Safety at 800.829.9580 with the serial number and we'll confirm which X-variant fits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAbout this sensor (NDIR \/ Non-Dispersive Infrared):\u003c\/strong\u003e NDIR detects combustible gas by measuring how much infrared light of a specific wavelength gets absorbed as it passes through a sampled volume of atmosphere. Hydrocarbons absorb IR at characteristic wavelengths; the sensor measures the drop in received IR intensity and calculates the LEL concentration. Because the measurement is optical rather than combustive, the sensor never contacts the gas chemically — nothing gets poisoned, nothing needs oxygen to work, and nothing wears out from combustion cycles. Standard 2-year sensor warranty, but expected service life is approximately 10 years in normal use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an NDIR LEL sensor:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds tolerance across successive cal events\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the LEL channel\u003c\/li\u003e\n\u003cli\u003eThe IR source or detector has degraded past specification — this is the normal end-of-life failure mode for NDIR (approximately 10 years in typical use)\u003c\/li\u003e\n\u003cli\u003ePhysical damage: the IR optical path has been contaminated, cracked, or occluded and cleaning has not restored function\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed AND you're rotating a fleet's sensor generation on a defined cadence for compliance documentation — though for NDIR, warranty-driven replacement is not the norm because expected life is 5x the warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-X3:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST4-MINI (X3 configuration) or SST4-PUMP (X3 configuration) whose NDIR sensor has failed or reached optical end-of-life\u003c\/li\u003e\n\u003cli\u003eFleet managers upgrading from CAT (X2) to NDIR (X3) after experiencing pellistor poisoning in the field\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSemiconductor manufacturing operators\u003c\/strong\u003e — silicone-heavy processes (RTV, gaskets, thermal interface materials, some cleanroom coatings) would poison CAT quickly; NDIR sidesteps that\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSour gas fields (H2S-rich oil \u0026amp; gas)\u003c\/strong\u003e — permian-basin and other sour-gas producers where sustained H2S exposure poisons CAT pellistors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefrigeration, HVAC, and cold-storage\u003c\/strong\u003e — halogen exposure from refrigerants and some cleaning solvents inhibits CAT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInert-purged tank workflows\u003c\/strong\u003e — pharmaceutical, specialty chemical, and some food-processing operations run nitrogen-purged tanks; NDIR works in low- or zero-oxygen atmospheres, CAT does not\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed remote monitoring stations\u003c\/strong\u003e — unmanned wellhead, tank battery, or pipeline monitors where a 10-year sensor lifetime dramatically reduces maintenance visits and total cost of ownership\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePainting, coatings, and mold-release-heavy operations\u003c\/strong\u003e — silicone in mold-release agents is a documented CAT poisoner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-cycle industrial installations\u003c\/strong\u003e where sensor swap-out is disruptive and less frequent replacement is worth a premium sensor cost\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty \/ Expected life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible IR-active hydrocarbon (0–100% LEL)\u003c\/td\u003e\n\u003ctd\u003eNDIR (Non-Dispersive Infrared)\u003c\/td\u003e\n\u003ctd\u003e2-year warranty \/ ~10-year expected life\u003c\/td\u003e\n\u003ctd\u003eWatchGas SST4-MINI (X3 config) + SST4-PUMP (X3 config)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo poisoning\u003c\/strong\u003e — immune to silicones, sulfur compounds (H2S, mercaptans), halogens, and tetraethyl lead. Runs in environments that would end a pellistor's life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong service life\u003c\/strong\u003e — up to 10 years typical operation (versus ~2 years for pellistor variants). Total-cost-of-ownership favors NDIR heavily in stable long-cycle deployments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVery low power consumption\u003c\/strong\u003e — up to two-month battery runtime on the SST4 platform\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks in inert atmospheres\u003c\/strong\u003e — does not require oxygen to detect combustible hydrocarbons; usable in nitrogen-purged tanks and other oxygen-deficient workflows\u003c\/li\u003e\n\u003cli\u003eOptical measurement principle — no combustive contact with the gas, no bead-degradation failure mode\u003c\/li\u003e\n\u003cli\u003e2-year sensor warranty (baseline for WatchGas SST replacement sensors)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for LEL sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against certified methane or pentane span gas, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's LEL sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to discuss whether CAT or NDIR is the right sensor tech for your environment, or to plan a fleet upgrade from CAT to NDIR.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST4):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST4-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST4 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-X3 — WatchGas Replacement NDIR LEL Sensor for SST4-MINI + SST4-PUMP (2-year warranty, ~10-year expected life)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-X3 compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X3 is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e — when configured with the X3 (NDIR) LEL sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e — when configured with the X3 (NDIR) LEL sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is NOT compatible with the SST4-MICRO (that uses the LPC MEMS pellistor — use SST-X1-RPL), or with MINI\/PUMP monitors configured with CAT (use SST-X2-RPL) or PUMP-specific LPC (use SST-X4-RPL).\u003c\/p\u003e\n\u003cp\u003eIf you're not certain how your MINI or PUMP was configured, check the invoice or product label, or call PK Safety at 800.829.9580 with the serial number and we'll confirm.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat gases does NDIR NOT detect?\u003c\/summary\u003e\n\u003cp\u003eNDIR detects combustible gas by measuring the absorption of infrared light at hydrocarbon-characteristic wavelengths. The trade-off: only IR-active gases show up on the sensor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNDIR detects reliably:\u003c\/strong\u003e methane, propane, butane, natural gas, and most heavier hydrocarbons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNDIR does NOT detect:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrogen (H2)\u003c\/strong\u003e — H2 is not infrared-active. NDIR is blind to it. WatchGas serves hydrogen monitoring via the separate SST1-H2 serviceable single-gas platform.\u003c\/li\u003e\n\u003cli\u003eSome non-IR-active industrial solvents and specialty chemistries\u003c\/li\u003e\n\u003cli\u003eNon-combustible gases (NDIR does not replace O2 or toxic-gas sensors — those channels are separate)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your primary combustible hazard is methane, propane, butane, or a natural-gas \/ oil \u0026amp; gas hydrocarbon mix, NDIR is a full-coverage upgrade. If your workflow includes broad VOC exposure, hydrogen, or unusual chemistries, the CAT variant (SST-X2-RPL) preserves broad-spectrum coverage — or a mixed-sensor deployment (CAT on some monitors, NDIR on others) may be the right answer.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does the SST-SPARE-X3 cost more than the CAT variant?\u003c\/summary\u003e\n\u003cp\u003eNDIR is a more complex sensor package than a pellistor — an infrared emitter, an optical path, a detector, and the signal-processing electronics that infer LEL concentration from measured IR absorption. That's more hardware than a catalytic bead in a Wheatstone bridge, and the manufacturing cost reflects it.\u003c\/p\u003e\n\u003cp\u003eThe total-cost-of-ownership calculation is different, though. NDIR is engineered for approximately 10 years of service; CAT pellistors typically deliver ~2 years. If you're replacing an NDIR sensor at end-of-life, you're doing so about once for every five pellistor replacements. In stable long-cycle deployments (fixed monitoring stations, unmanned tank battery monitors, long-life fleet installations), NDIR often works out cheaper per year of monitoring.\u003c\/p\u003e\n\u003cp\u003eFor high-turnover portable deployments where the monitor sees frequent damage, CAT's lower per-sensor cost may still win the math. Call PK Safety at 800.829.9580 to talk through your specific replacement cadence and environment.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow long does an NDIR LEL sensor typically last?\u003c\/summary\u003e\n\u003cp\u003eApproximately 10 years in normal operation, per the WatchGas specification. That's roughly five times a typical pellistor sensor's ~2-year service life.\u003c\/p\u003e\n\u003cp\u003eThe reason: NDIR is an optical measurement, not a combustive one. The sensor never contacts the sampled gas chemically — nothing burns, nothing gets poisoned, nothing wears out from combustion cycles. The failure modes are optical (IR emitter degradation, detector aging, optical path contamination) rather than chemical, and they progress on a much slower timeline than pellistor bead degradation.\u003c\/p\u003e\n\u003cp\u003eThe 2-year sensor warranty is conservative and standard across the WatchGas SST replacement-sensor catalog — but for NDIR specifically, most sensors deliver service life well beyond the warranty period.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is LEL monitoring different from toxic-gas monitoring — and why does the sensor matter?\u003c\/summary\u003e\n\u003cp\u003eToxic-gas sensors (H2S, CO, O2) protect against exposure — the alarm setpoints are anchored to permissible exposure limits like OSHA PELs or NIOSH RELs, and the concentrations of concern are typically parts per million.\u003c\/p\u003e\n\u003cp\u003eLEL sensors protect against fire and explosion. The scale is 0–100% LEL, where 100% LEL means the atmosphere has reached the lower flammable limit and is now ignitable given a spark or heat source. The concentrations are much higher than toxic thresholds — methane at 100% LEL is about 5% by volume, or 50,000 ppm.\u003c\/p\u003e\n\u003cp\u003eOSHA's permit-required confined space rule (29 CFR 1910.146) draws two hard lines: workers must retrieve at 10% LEL, and evacuate at 100% LEL. A drifting LEL sensor means those hard lines are being drawn in the wrong place — the difference between exiting a confined space safely and being inside when an atmosphere becomes ignitable.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-X3 myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST4 platform is designed for user sensor replacement, and the WatchGas SST4-MINI \/ SST4-PUMP manual walks through the swap procedure. After installation, you must complete a full calibration to verify the new NDIR sensor's response against a known span gas — typically 50% LEL methane (2.5% CH4 in air).\u003c\/p\u003e\n\u003cp\u003eNDIR calibration is straightforward with standard methane cal gas (widely stocked, non-corrosive). DIY sensor swap is a realistic path if you have a functioning calibration workflow.\u003c\/p\u003e\n\u003cp\u003eIf you don't have LEL cal gas or a calibration station on hand — or you'd rather have the swap done by a factory-trained technician who verifies calibration against multiple LEL span points — sending the monitor to PK Safety is often the safer path. We handle the swap, cal gas, and return-to-service documentation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I upgrade my whole fleet from CAT to NDIR?\u003c\/summary\u003e\n\u003cp\u003eOnly if the poisoning risk is real in your environment. NDIR carries a real premium in per-sensor cost, and the total-cost-of-ownership advantage depends on how frequently your CAT sensors actually fail from poisoning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFleet upgrade to NDIR makes sense if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou're replacing CAT sensors materially more frequently than the 2-year warranty suggests you should\u003c\/li\u003e\n\u003cli\u003eYour operating environment contains documented pellistor poisons (silicones, H2S, halogens) as a persistent condition, not an occasional exposure\u003c\/li\u003e\n\u003cli\u003eYou run inert-atmosphere workflows where CAT wouldn't function at all\u003c\/li\u003e\n\u003cli\u003eYour fleet is largely fixed \/ long-cycle installations where the 10-year lifetime pays back the sensor premium\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStay with CAT (mixed or full fleet) if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour environment is clean and CAT sensors are reliably delivering close to their expected 2-year life\u003c\/li\u003e\n\u003cli\u003eYou need broad-spectrum VOC coverage that NDIR cannot provide\u003c\/li\u003e\n\u003cli\u003eYour fleet is high-turnover portable deployments where physical damage drives replacements more than sensor life\u003c\/li\u003e\n\u003cli\u003eYou monitor hydrogen alongside hydrocarbons — you'd need a separate H2 sensor either way\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 to talk through a fleet-level CAT vs NDIR decision. We can walk through your current replacement cadence, environmental risk factors, and monitoring scope and help you land on the right mix.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which X-variant fits your monitor, or whether NDIR is the right upgrade for your environment? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST4 platform, LEL sensor technology trade-offs, and fleet-level replacement planning will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728517487,"sku":"WG01-SST-SPARE-X3","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-X3---Sensor---HP-LEL-IR-for-SST4-Mini_-Pump---1---K1E800x800compressed.jpg?v=1771008009"},{"product_id":"watchgas-sst4-pump-replacement-lpc-lel-sensor-sst-spare-x4","title":"WatchGas SST4-PUMP Replacement LPC LEL Sensor SST-SPARE-X4","description":"\u003cp\u003e\u003cstrong\u003eWhen your LEL sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST4 line. This WatchGas Replacement LPC LEL Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e when configured with an LPC (Low Power Consumption) LEL sensor.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAn LEL sensor is the fire channel of a 4-gas monitor.\u003c\/strong\u003e It doesn't measure toxicity — it measures how close the atmosphere is to being ignitable. OSHA's permit-required confined space rule (29 CFR 1910.146) draws this line concretely: workers must retrieve at 10% LEL and evacuate at 100% LEL. For pump-drawn sampling in particular, LEL monitoring is often the very first entry-preparation step — you sample the atmosphere before anyone climbs into a tank, a vault, or a permit-required space to determine whether entry is permissible at all.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy LPC on the SST4-PUMP: battery runtime and mechanical robustness for portable field sampling.\u003c\/strong\u003e The SST4-PUMP is the pump-drawn sampling variant of the SST4 platform — built for the crew that samples an atmosphere through a wand or sampling tube before entry, or that takes gas readings from remote hard-to-reach points across a job site. The LPC LEL sensor is the battery-first, shock-resistant choice for that form factor. MEMS-scale pellistor architecture means fast response to light hydrocarbons (methane, propane, natural gas), mechanical robustness against the drops and impacts that portable field monitors absorb, and low enough power draw that a working shift's battery isn't consumed by the LEL channel alone.\u003c\/p\u003e\n\n\u003cp\u003eThe trade-off (honest disclosure): LPC is still a pellistor at heart. Silicones, sulfur compounds (H2S in sour gas or wastewater), and halogens will poison it just as they poison the CAT variant — the shock-resistance advantage doesn't extend to poisoning resistance. If your monitoring environment contains any of those chronic poisoning agents, consider the NDIR variant (SST-X3-RPL) as a fleet-level configuration change. See the FAQ for the LPC-vs-NDIR decision on the pump platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement LPC (Low Power Consumption) MEMS-style pellistor combustible-gas sensor cell for the WatchGas SST4-PUMP monitor configured with an LPC LEL sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the SST4-MICRO (that also uses an LPC MEMS pellistor, but a smaller variant — use SST-X1-RPL for the MICRO).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the SST4-MINI (which uses CAT \/ X2 or NDIR \/ X3 — not LPC).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with SST4-PUMP monitors configured with CAT (use SST-X2-RPL) or NDIR (use SST-X3-RPL).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST4-PUMP to function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWatchGas SST4 LEL sensor family — self-select the correct variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitor(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X1-RPL\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption)\u003c\/td\u003e\n\u003ctd\u003eSST4-MICRO only\u003c\/td\u003e\n\u003ctd\u003eBattery-first compact diffusion monitoring; light-hydrocarbon response\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X2-RPL\u003c\/td\u003e\n\u003ctd\u003eCAT (Catalytic bead \/ pellistor)\u003c\/td\u003e\n\u003ctd\u003eSST4-MINI + SST4-PUMP\u003c\/td\u003e\n\u003ctd\u003eTraditional broad-spectrum combustible-gas response — industry-standard for methane, propane, and common hydrocarbon mixes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSST-X3-RPL\u003c\/td\u003e\n\u003ctd\u003eNDIR (Non-Dispersive Infrared)\u003c\/td\u003e\n\u003ctd\u003eSST4-MINI + SST4-PUMP\u003c\/td\u003e\n\u003ctd\u003ePoisoning-immune, works in oxygen-deficient atmospheres, 10-year expected lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSST-SPARE-X4 \u003cem\u003e(this SKU)\u003c\/em\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLPC (Low Power Consumption)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSST4-PUMP only\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery-first pump-drawn sampling; field-service and confined-space entry preparation; mechanical shock resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you're not certain how your SST4-PUMP was configured, check the invoice or product label, or call PK Safety at 800.829.9580 with the serial number and we'll confirm which X-variant fits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAbout this sensor (LPC \/ MEMS-style pellistor for pump form factor):\u003c\/strong\u003e the LPC design is a low-power MEMS-scale pellistor optimized for the battery-operated portable form factor of the SST4-PUMP. Same fundamental detection principle as the traditional catalytic bead — combustible gas contacts the catalyst-coated bead, burns, heats it, and unbalances a Wheatstone bridge to produce the LEL reading — but engineered for lower current draw and higher mechanical robustness. Standard 2-year sensor warranty.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhen to replace an LEL sensor:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds tolerance across successive cal events — with LPC pellistors, this often shows up as span-gas response falling short of expected reading, indicating catalytic activity loss\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the LEL channel\u003c\/li\u003e\n\u003cli\u003eThe sensor has been exposed to a known pellistor poison (silicone, H2S, halogens, tetraethyl lead) even if it appears to still respond — poisoning damage is progressive and permanent, and this is the most common early-life failure mode for portable LPC sensors deployed into oil \u0026amp; gas or industrial environments\u003c\/li\u003e\n\u003cli\u003eThe sensor has been exposed to a combustible atmosphere above its measurement range (\u0026gt;100% LEL) — thermal damage from over-range exposure may not recover\u003c\/li\u003e\n\u003cli\u003ePhysical damage after a drop or impact — LPC MEMS design is more shock-resistant than traditional catalytic bead, but a hard enough impact can still break the sensor\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed. For confined-space entry programs and permit-space workflows, proactive replacement on a defined cadence is standard operating discipline\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a defined cadence for compliance documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eBest-in-batch economics:\u003c\/strong\u003e the SST-SPARE-X4 delivers the largest single-sensor savings across the WatchGas SST replacement-sensor catalog. $175 sensor vs $980 full SST4-PUMP monitor is a $805 savings — a 17.9% sensor-to-monitor ratio. If the rest of the monitor (housing, pump, battery, display, and the O2, CO, H2S sensors) is in good working order, LPC sensor swap is the highest-ROI single maintenance action across the entire WatchGas SST fleet.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-X4:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST4-PUMP (X4 \/ LPC configuration) whose LEL sensor has drifted, failed a bump, been exposed to a pellistor poison, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfined-space entry contractors\u003c\/strong\u003e — pump-drawn sampling before entry is the canonical LPC-PUMP application. Battery runtime matters when the crew does multiple entries per shift.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; gas tank entry and turnaround crews\u003c\/strong\u003e — tank-battery hatches, storage tank interiors, sump inspections. API RP 2016 workflows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetroleum refining maintenance crews\u003c\/strong\u003e — unit-shutdown gas testing where a portable pump-drawn monitor is carried across many hard-to-reach sample points\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural gas utility field service\u003c\/strong\u003e — leak investigation, meter-set validation, service repair where pump-drawn sampling is preferred over diffusion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater treatment\u003c\/strong\u003e — wet-well and headworks entry preparation (be alert to H2S co-exposure poisoning risk on any pellistor variant — chronic H2S is a signal to consider NDIR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine vessel interior spaces\u003c\/strong\u003e — cargo hold entry preparation, engine-room and ballast-tank sampling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLandfill and biogas operators\u003c\/strong\u003e — confined-space entry preparation in gas collection infrastructure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrewery and distillery\u003c\/strong\u003e — tank and cellar entry preparation (ethanol vapor + confined space)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUtility vault entry contractors\u003c\/strong\u003e (telecom, water, gas) — pump-sampling before descending\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible gas (0–100% LEL)\u003c\/td\u003e\n\u003ctd\u003eLPC (Low Power Consumption MEMS-style pellistor)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eWatchGas SST4-PUMP (X4 config)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFast response time for light hydrocarbons (methane, propane, butane, natural gas)\u003c\/li\u003e\n\u003cli\u003eMechanical robustness — MEMS design resistant to impact shock (a common failure mode for traditional catalytic bead pellistors in portable field-service use)\u003c\/li\u003e\n\u003cli\u003eLow power consumption — optimized for extended battery runtime in field-service and multi-entry-per-shift workflows\u003c\/li\u003e\n\u003cli\u003e2-year sensor warranty (baseline for WatchGas SST replacement sensors)\u003c\/li\u003e\n\u003cli\u003eBest-in-batch economics — $805 savings vs full SST4-PUMP monitor replacement, the largest single-sensor swap ROI in the WatchGas SST fleet\u003c\/li\u003e\n\u003cli\u003eStandard cal gas: 50% LEL methane (2.5% CH4 in air) — widely stocked, non-corrosive\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for LEL sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against certified methane or pentane span gas, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's LEL sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to discuss whether LPC, CAT, or NDIR is the right sensor tech for your SST4-PUMP environment, or to plan a fleet-level LEL sensor strategy across portable and fixed deployments.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST4):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST4-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST4 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-X4 — WatchGas Replacement LPC LEL Sensor for SST4-PUMP (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-X4 compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X4 is compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e ONLY — and only when the monitor is configured with an LPC (Low Power Consumption) LEL sensor.\u003c\/p\u003e\n\u003cp\u003eIt is NOT compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe SST4-MICRO (uses SST-X1-RPL — also LPC, but a smaller variant sized for the compact diffusion housing)\u003c\/li\u003e\n\u003cli\u003eThe SST4-MINI (uses SST-X2-RPL CAT or SST-X3-RPL NDIR — no LPC config)\u003c\/li\u003e\n\u003cli\u003eSST4-PUMP monitors configured with CAT (use SST-X2-RPL) or NDIR (use SST-X3-RPL)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're not certain how your SST4-PUMP was configured, check the invoice or product label, or call PK Safety at 800.829.9580 with the serial number and we'll confirm.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eLPC vs CAT vs NDIR on the SST4-PUMP: which is right for my environment?\u003c\/summary\u003e\n\u003cp\u003eThe SST4-PUMP is the only monitor in the SST4 family with three LEL sensor configuration options. The right choice depends on your monitoring environment and how the monitor is deployed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLPC (SST-SPARE-X4, this SKU) is the right choice if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour primary use case is portable field-service and confined-space entry preparation — crews carrying the monitor across job sites, doing multiple entries per shift\u003c\/li\u003e\n\u003cli\u003eBattery runtime is a priority (LPC's low power draw extends time between recharges)\u003c\/li\u003e\n\u003cli\u003eMechanical robustness matters (portable monitors get dropped; MEMS pellistor is more shock-resistant than traditional catalytic bead)\u003c\/li\u003e\n\u003cli\u003eYour monitoring environment is clean (no silicones, no chronic H2S, no halogens, no inert atmospheres)\u003c\/li\u003e\n\u003cli\u003eThe combustible gases you monitor are common light hydrocarbons (methane, propane, natural gas)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCAT (SST-X2-RPL) is the right choice if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou need broad-spectrum LEL response across many different combustible chemistries (VOCs, solvents, alcohols)\u003c\/li\u003e\n\u003cli\u003eMonitoring workflow includes fumes from painting, coatings, printing, or fermentation where LPC's light-hydrocarbon optimization is a poor fit\u003c\/li\u003e\n\u003cli\u003eYou want the industry-standard sensor tech with the longest field track record\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNDIR (SST-X3-RPL) is the right choice if:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour environment has silicones, chronic H2S, or halogens (all pellistor poisons — LPC and CAT both fail; NDIR is immune)\u003c\/li\u003e\n\u003cli\u003eYou need LEL monitoring in oxygen-deficient or inert atmospheres (LPC and CAT require oxygen; NDIR does not)\u003c\/li\u003e\n\u003cli\u003eYou want a 10-year expected sensor life for fixed \/ long-cycle deployments (LPC and CAT are ~2 years)\u003c\/li\u003e\n\u003cli\u003eYou do not need to detect hydrogen (NDIR is blind to H2) or broad-spectrum non-IR-active VOCs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 to talk through your specific monitor deployment. A fleet often runs a mix — LPC on portable field-service monitors, NDIR on fixed monitoring stations, and CAT where broad-spectrum coverage is needed.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I run a mixed fleet — LPC on some monitors and NDIR on others?\u003c\/summary\u003e\n\u003cp\u003eYes, and this is often the smartest total-cost-of-ownership approach for a diversified operation.\u003c\/p\u003e\n\u003cp\u003eA common mixed-fleet pattern:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortable field-service monitors (SST4-PUMP with LPC \/ X4):\u003c\/strong\u003e confined-space entry preparation, refinery unit-shutdown gas testing, utility field crews. Battery runtime + shock resistance + $175 sensor economics are the priority.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed remote monitoring stations (SST4-PUMP with NDIR \/ X3):\u003c\/strong\u003e unmanned wellhead, tank battery, or pipeline monitors. 10-year expected sensor life dramatically reduces maintenance visits and total cost of ownership.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortable monitors in poisoning-heavy environments (SST4-PUMP with NDIR \/ X3 despite the premium):\u003c\/strong\u003e silicone-heavy semiconductor \/ manufacturing operations, sour gas H2S-rich fields. LPC would fail from poisoning before the shift ended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach monitor's configuration lives in the monitor itself (X4 vs X3 vs X2 config), so a mixed fleet is a real deployment strategy — not a workaround. The replacement sensor SKU always matches the monitor's original configuration. Call PK Safety at 800.829.9580 to talk through a fleet-level LEL sensor strategy.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow is LEL monitoring different from toxic-gas monitoring — and why does the sensor matter?\u003c\/summary\u003e\n\u003cp\u003eToxic-gas sensors (H2S, CO, O2) protect against exposure — the alarm setpoints are anchored to permissible exposure limits like OSHA PELs or NIOSH RELs, and the concentrations of concern are typically parts per million.\u003c\/p\u003e\n\u003cp\u003eLEL sensors protect against fire and explosion. The scale is 0–100% LEL, where 100% LEL means the atmosphere has reached the lower flammable limit and is now ignitable given a spark or heat source. The concentrations are much higher than toxic thresholds — methane at 100% LEL is about 5% by volume, or 50,000 ppm.\u003c\/p\u003e\n\u003cp\u003eOSHA's permit-required confined space rule (29 CFR 1910.146) draws two hard lines: workers must retrieve at 10% LEL, and evacuate at 100% LEL. For pump-drawn sampling with the SST4-PUMP, LEL monitoring is often the very first entry-preparation step — sample the space before anyone climbs in.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat causes an LPC LEL sensor to fail or drift?\u003c\/summary\u003e\n\u003cp\u003eThe most common LPC LEL sensor failure modes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilicone poisoning\u003c\/strong\u003e — the classic pellistor killer. Silicones from RTV sealants, greases, lubricants, some hand creams, and industrial mold-release agents deposit on the sensor and reduce catalytic activity. Progressive and typically permanent. LPC's MEMS architecture doesn't confer silicone-poisoning immunity — it's engineered for shock resistance and low power, not chemical durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSulfur compound poisoning (H2S, mercaptans)\u003c\/strong\u003e — common concern in sour gas oil \u0026amp; gas fields and wastewater environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalogen poisoning\u003c\/strong\u003e — chlorinated solvents, refrigerants, and other halogenated compounds inhibit pellistor response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-range exposure\u003c\/strong\u003e — pellistor cells exposed to concentrations above 100% LEL can be thermally damaged and may not recover full sensitivity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical shock\u003c\/strong\u003e — LPC's MEMS design is more shock-resistant than traditional catalytic bead, but a hard enough impact can still break the sensor. Field-service portable monitors take real abuse; if you're seeing shock-related failures, the LPC choice is already the right pellistor tech, but call PK Safety to discuss whether physical handling changes could reduce failure rate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNormal wear\u003c\/strong\u003e — pellistor cells drift with cumulative use as the bead structure ages\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your SST4-PUMP has been used in an environment with silicone, sulfur, or halogen exposure and the LEL channel is showing drift, poisoning is the most likely cause — and if the poisoning source is chronic, NDIR (SST-X3-RPL) is a better long-term fit than another LPC swap.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I install the SST-SPARE-X4 myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST4-PUMP is designed for user sensor replacement, and the WatchGas SST4-PUMP manual walks through the swap procedure. After installation, you must complete a full calibration to verify the new LEL sensor's response against a known span gas — typically 50% LEL methane (2.5% CH4 in air) or 50% LEL pentane.\u003c\/p\u003e\n\u003cp\u003eLEL calibration is more straightforward than specialty-gas calibration (methane cal gas is standard, non-corrosive, and widely stocked), so DIY sensor swap is a realistic path if you have a functioning calibration workflow. For SST4-PUMP specifically, verify pump-drawn calibration performance across the sample-tube length you actually use in the field — sensor response can differ slightly between direct-diffusion cal and pump-drawn cal.\u003c\/p\u003e\n\u003cp\u003eIf you don't have LEL cal gas or a calibration station on hand — or you'd rather have the swap done by a factory-trained technician who verifies calibration against multiple LEL span points and validates pump-tube behavior — sending the monitor to PK Safety is often the safer path. We handle the swap, cal gas, pump-integrity check, and return-to-service documentation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I replace the LEL sensor or buy a new SST4-PUMP?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-X4 sensor cell costs $175. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eSST4-PUMP monitor\u003c\/a\u003e (X4 \/ LPC config) starts at $980. Sensor swap saves $805 — the largest single-sensor swap ROI in the WatchGas SST fleet, at a 17.9% sensor-to-monitor ratio.\u003c\/p\u003e\n\u003cp\u003eSensor replacement is the more cost-effective path when the monitor's housing, sampling pump, display, battery, and other three sensors (O2, CO, H2S) are in good working order. Full-monitor replacement is a better fit when the monitor itself is aging, the sampling pump has become unreliable, the housing has taken damage, or multiple sensors are due for replacement — and a full new monitor comes with the 3-year instrument warranty on the electronics.\u003c\/p\u003e\n\u003cp\u003eIf you're replacing the LEL sensor because of chronic pellistor poisoning in your environment (silicones, H2S, halogens) rather than end-of-warranty wear, the right call may be an NDIR upgrade path (SST-X3-RPL) instead of another LPC sensor. Call PK Safety at 800.829.9580 to talk through the decision.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which X-variant fits your monitor, or whether LPC, CAT, or NDIR is the right sensor tech for your SST4-PUMP environment? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the SST4 platform, LEL sensor technology trade-offs, and fleet-level replacement planning will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671728583023,"sku":"WG01-SST-SPARE-X4","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-X4-SPARE-1---K1E800x800comrpessed.jpg?v=1771008092"},{"product_id":"watchgas-sst1-replacement-h2-sensor-sst-spare-h2","title":"WatchGas SST1 Replacement H2 Sensor SST-SPARE-H2","description":"\u003cp\u003e\u003cstrong\u003eWhen your H2 sensor drifts, you don't replace the whole monitor. You swap the sensor cell.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThat's the operational advantage of the serviceable WatchGas SST1 line. Traditional single-gas monitors are single-use — when the sensor reaches end-of-life or a bump test reveals unrecoverable drift, the whole unit gets discarded. The SST1 platform is designed to be maintained: this WatchGas Replacement H2 Sensor drops into the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2-gas-detector-sst1-h2\"\u003eWatchGas SST1-H2 Serviceable H2 Gas Detector\u003c\/a\u003e, extending the monitor's service life beyond the original sensor's lifespan.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHydrogen isn't a toxic exposure hazard. It's a fire and explosion hazard.\u003c\/strong\u003e Colorless, odorless, and lighter than air — hydrogen accumulates near ceilings, vents, and enclosed high points where workers can't smell or see it. Its flammable range in air runs from 4% (the Lower Explosive Limit) all the way to 75% — one of the widest flammable ranges of any industrial gas. Sensor drift on H2 doesn't mean a missed exposure event; it means the monitor may not alarm before the atmosphere reaches an ignitable concentration. For hydrogen monitoring, sensor accuracy is a fire-prevention input.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat this sensor is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a factory replacement H2 electrochemical sensor cell for the serviceable SST1-H2 monitor and WatchGas SST4-series multi-gas monitors \u003cem\u003ecustom-configured with a dedicated H2 sensor slot\u003c\/em\u003e. This is a specialty configuration — SST4 monitors ordered with the standard 4-gas set (LEL\/O2\/CO\/H2S) don't have a dedicated H2 slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e the same as an LEL sensor. Catalytic bead LEL sensors in SST4-family monitors detect hydrogen as one combustible gas among many, but report readings as % LEL of a calibrated gas (typically methane) — not as a specific H2 concentration. If you need dedicated H2 monitoring with a direct concentration readout, that requires the SST1-H2 monitor with this dedicated H2 sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a standalone gas detection device. The sensor cell requires a compatible WatchGas SST monitor to function.\u003c\/li\u003e\n\u003cli\u003eThe WatchGas SST1 line does NOT include Limited-Life (2-year or 3-year alert-only) monitors for hydrogen — so, unlike H2S\/CO\/O2 replacement sensors, there's no non-serviceable variant to exclude from the compatibility list.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSolid polymer electrochemical sensor technology.\u003c\/strong\u003e The dry-cell design eliminates the liquid electrolyte used in traditional electrochemical sensors, giving the cell better long-term stability, no leak risk in truck-bed or field storage, and better tolerance for temperature extremes. Ultra-low power consumption compared to older H2 sensor designs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen to replace an H2 sensor cell:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe sensor fails a bump test and won't recover on recalibration\u003c\/li\u003e\n\u003cli\u003eCalibration drift exceeds acceptable tolerance across successive cal events\u003c\/li\u003e\n\u003cli\u003eThe monitor displays a sensor fault code specific to the H2 channel\u003c\/li\u003e\n\u003cli\u003eThe sensor's warranty period (2 years) has elapsed and calibration reliability starts trending down\u003c\/li\u003e\n\u003cli\u003eYou're rotating a fleet's sensor generation on a proactive maintenance cadence — especially valuable in continuous-hydrogen environments (battery charging rooms, fuel cell facilities, refinery hydrogen recovery units) where sensor drift can silently defeat leak detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWho buys the SST-SPARE-H2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOwners of the WatchGas SST1-H2 serviceable H2 monitor whose current sensor has drifted, failed a bump, or reached end-of-warranty\u003c\/li\u003e\n\u003cli\u003eBattery manufacturing operations and battery-charging rooms (lead-acid batteries release H2 during charging — warehouse charging areas require continuous H2 monitoring per NFPA 505 for industrial trucks)\u003c\/li\u003e\n\u003cli\u003eHydrogen fuel cell manufacturers, testers, and R\u0026amp;D facilities\u003c\/li\u003e\n\u003cli\u003eChemical processing plants using H2 as a reagent (ammonia synthesis, methanol production, hydrocracking)\u003c\/li\u003e\n\u003cli\u003eSemiconductor fabrication facilities using H2 as a carrier or reducing gas\u003c\/li\u003e\n\u003cli\u003eMetallurgy operations with H2 annealing atmospheres or sintering\u003c\/li\u003e\n\u003cli\u003eAerospace propellant handling facilities\u003c\/li\u003e\n\u003cli\u003ePetroleum refineries with hydrogen recovery, hydrotreating, or hydrocracking units\u003c\/li\u003e\n\u003cli\u003eNuclear power plants monitoring H2 buildup in containment vessels\u003c\/li\u003e\n\u003cli\u003eEmerging hydrogen economy operators — hydrogen-fueled vehicle refueling stations, hydrogen production and storage facilities, hydrogen pipeline infrastructure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSensor specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible monitors\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH2 (hydrogen)\u003c\/td\u003e\n\u003ctd\u003eSolid polymer electrochemical (dry-cell)\u003c\/td\u003e\n\u003ctd\u003e2 years\u003c\/td\u003e\n\u003ctd\u003eSST1-H2, SST4-series (with dedicated H2 sensor slot)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy across the H2 detection range\u003c\/li\u003e\n\u003cli\u003e2-year sensor warranty\u003c\/li\u003e\n\u003cli\u003eUltra-low power consumption (optimized for battery-operated and IoT-integrated monitors)\u003c\/li\u003e\n\u003cli\u003eHigh precision at low H2 concentrations — critical for early leak detection well before the 4% LEL threshold\u003c\/li\u003e\n\u003cli\u003eNo zero drift\u003c\/li\u003e\n\u003cli\u003eSilicone-resistant (no poisoning by common industrial silicone contaminants)\u003c\/li\u003e\n\u003cli\u003eDirect linearity across the detection range\u003c\/li\u003e\n\u003cli\u003eHigh temperature range tolerance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e If you'd rather send the monitor to us for sensor replacement than swap the cell yourself, we handle that in-house — full swap, calibration verification against a certified H2 standard, and return-to-service. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sensor lifecycle. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your hydrogen monitoring workflow with someone who understands the SST platform and industrial H2 detection.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST1):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgas.com\/app\/uploads\/2024\/03\/SST1-brochure-1.1.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST1 Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-SPARE-H2 — WatchGas Replacement H2 (Hydrogen) Sensor (2-year warranty)\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-SPARE-H2 sensor compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-H2 is compatible with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2-gas-detector-sst1-h2\"\u003eSST1-H2 Serviceable H2 Gas Detector\u003c\/a\u003e — the single-gas hydrogen monitor is designed around this sensor\u003c\/li\u003e\n\u003cli\u003eWatchGas SST4-series multi-gas monitors \u003cstrong\u003eonly when custom-configured with a dedicated H2 sensor slot\u003c\/strong\u003e (not the standard LEL\/O2\/CO\/H2S configuration)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure which configuration your SST4 has? Call PK Safety at 800.829.9580 with your monitor's serial number — we can look up the sensor set from the WatchGas manufacturing record.\u003c\/p\u003e\n\u003cp\u003eThe WatchGas SST1 catalog does not include Limited-Life (2-year or 3-year alert-only) monitors for hydrogen, so there's no non-serviceable H2 variant to exclude from compatibility.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhy is hydrogen monitored differently from toxic gases like H2S or CO?\u003c\/summary\u003e\n\u003cp\u003eHydrogen isn't a toxic exposure hazard — it's a fire and explosion hazard. That changes what the monitor is protecting against:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo OSHA PEL.\u003c\/strong\u003e Hydrogen has no permissible exposure limit under OSHA regulations because it's not toxic at concentrations workers would encounter. OSHA's concern is fire and explosion, not chronic exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlammable range: 4–75%.\u003c\/strong\u003e Hydrogen's Lower Explosive Limit (LEL) is 4% by volume in air (40,000 ppm) — the concentration at which an ignition source can start a flame. Its Upper Explosive Limit (UEL) is 75% — one of the widest flammable ranges of any industrial gas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition energy: 0.019 mJ.\u003c\/strong\u003e Hydrogen requires extremely little energy to ignite — a static-electricity discharge from clothing can be enough. That's why monitoring is critical wherever H2 may accumulate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutoignition: ~1,076°F (580°C).\u003c\/strong\u003e At that temperature, H2 ignites without any external spark. Hot surfaces in industrial environments (steam pipes, heaters, motors) can serve as ignition sources.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eH2 monitors are set to alarm well below the 4% LEL threshold — typically at 10%–25% of LEL (0.4%–1% H2 in air) for a low-level alarm, giving crews time to evacuate and ventilate before the atmosphere reaches ignitable concentration.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow do I know it's time to replace my H2 sensor?\u003c\/summary\u003e\n\u003cp\u003eFour common signals:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor fails a bump test\u003c\/strong\u003e and won't recover after recalibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration drift exceeds acceptable tolerance\u003c\/strong\u003e across successive cal events.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe monitor displays a sensor fault code\u003c\/strong\u003e specific to the H2 channel. Cell exhaustion, extreme temperature or humidity exposure, or physical damage can trigger a fault.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe sensor is out of its warranty period.\u003c\/strong\u003e The SST-SPARE-H2 carries a 2-year warranty. Beyond that, sensor reliability trends down — for hydrogen monitoring in continuous-H2 environments, proactive replacement at warranty end is standard operating discipline.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I install the SST-SPARE-H2 myself, or do I need to send the monitor to PK Safety?\u003c\/summary\u003e\n\u003cp\u003eBoth paths work. The SST1 platform is designed for user sensor replacement — the sensor cell is accessed through the monitor's service compartment, and the WatchGas SST1 manual walks through the swap procedure. After installation, you'll need to complete a full calibration to verify the new sensor's response against a known H2 standard (typically 2.5% H2 in air or nitrogen balance).\u003c\/p\u003e\n\u003cp\u003eHydrogen calibration gas requires special handling and storage — it's flammable at cal concentrations if released to a confined space. If you don't have a hydrogen cal workflow set up, sending the monitor to PK Safety for the swap and calibration verification is often the safer path. We stock the appropriate cal gas and can verify the sensor's response in our shop before returning the monitor to service.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eShould I replace the sensor or buy a new SST1-H2 monitor?\u003c\/summary\u003e\n\u003cp\u003eThe SST-SPARE-H2 sensor cell costs $275. A full new \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst1-serviceable-h2-gas-detector-sst1-h2\"\u003eSST1-H2 monitor\u003c\/a\u003e costs $420. Sensor swap saves $145 — about 65% of the full-monitor price for the maintenance action.\u003c\/p\u003e\n\u003cp\u003eThe sensor replacement is the more cost-effective path when your monitor's housing, display, battery, and electronics are in good working order. Full-monitor replacement is a better fit when the monitor itself is aging, has physical damage, or has a battery no longer holding charge — and a full new monitor also comes with the 3-year instrument warranty on the electronics.\u003c\/p\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 with your monitor's condition and we'll walk you through the choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat alarm setpoints should I configure on my SST1-H2?\u003c\/summary\u003e\n\u003cp\u003eIndustry standard for hydrogen monitoring is to alarm well below the 4% LEL threshold, giving crews time to evacuate and ventilate before the atmosphere reaches ignitable concentration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow alarm:\u003c\/strong\u003e typically 10% of LEL (0.4% H2 in air \/ 4,000 ppm). An operational \"start ventilating and investigate the source\" threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh alarm:\u003c\/strong\u003e typically 20–25% of LEL (0.8–1% H2 in air \/ 8,000–10,000 ppm). An \"evacuate and shut off source\" threshold.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSetpoints vary by application: battery charging rooms may run stricter (5% LEL low, 10% high) because of continuous H2 generation and the shift-worker context; refinery hydrogen recovery areas may run different setpoints per site-specific risk assessment. NFPA 55, NFPA 2, and site-specific insurance\/permit requirements should drive the final configuration.\u003c\/p\u003e\n\u003cp\u003ePK Safety can help you calibrate setpoints to your facility's risk profile — call 800.829.9580.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp\u003e\u003cstrong\u003eNot sure whether your SST4 has a dedicated H2 sensor slot, or how to set alarm thresholds for your hydrogen monitoring application? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows hydrogen monitoring and the SST platform will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52671813091695,"sku":"WG01-SST-SPARE-H2","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-SPARE-H2---Watchgas-SST-sensor-H2-0-1000ppm-for-SST1---2---K1E800x800compressed.jpg?v=1771007882"},{"product_id":"watchgas-sst4-mini-diffusion-bundle","title":"WatchGas SST4 MINI Diffusion Bundle","description":"\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eReceive $50 off the calibration kit — discount applied automatically at checkout.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOne line item. One invoice. One box. Everything you need to stand up a confined-space gas detection program the day it arrives.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eStanding up a confined-space monitoring capability means sourcing more than a monitor. You need the monitor itself, a calibration kit, the right cal gas mix for the sensor set, a regulator that matches the sensor's flow requirement, tubing to connect them, and a padded case to keep everything together in a truck bed or on a job site. Sourcing those components separately is a purchasing exercise across multiple suppliers. This bundle collapses that to a single order.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's in the WatchGas SST4 MINI Diffusion Bundle:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e — continuously monitors LEL (combustible gas), O2 (oxygen), CO (carbon monoxide), and H2S (hydrogen sulfide) with a digital ppm readout and configurable alarms. Two variants of this bundle give you the choice of LEL sensor type (see below).\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/k-safety-watchgas-equivalent-calibration-kit-pkcalkit-wg\"\u003ePK Safety WatchGas Equivalent Calibration Kit (PKCalKit-WG)\u003c\/a\u003e — automatically discounted $50 when purchased in this bundle.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/pk-safety-watchgas-equivalent-4-gas-calibration-gas-mix-34-liter\"\u003ePK Safety WatchGas Equivalent 4-Gas Calibration Gas Mix (34 liter cylinder)\u003c\/a\u003e — matches the SST4 MINI's four-gas sensor set.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/intermountain-specialty-gases-fixed-flow-regulator-flow-rate-0-5lpm\"\u003eIntermountain Specialty Gases Fixed Flow Regulator (0.5 LPM)\u003c\/a\u003e — matches the SST4 MINI's diffusion-flow calibration requirement.\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/isg-tygon-tubing-for-calibration-gas-t-1\"\u003eISG Tygon Tubing for Calibration Gas (1 foot)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/isg-small-black-calibration-carrying-case-c-100\"\u003eISG Small Black Calibration Carrying Case (C-100)\u003c\/a\u003e — keeps the components together for field or truck storage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eChoose your LEL sensor type: CAT or NDIR.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis bundle ships in two variants that differ only in the LEL sensor technology of the SST4-MINI:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLEL CAT (Catalytic Bead) — $1,222.58:\u003c\/strong\u003e the safety industry's standard combustible-gas sensor. Detects any flammable hydrocarbon vapor and detects hydrogen. Susceptible to poisoning by silicones (found in some caulks, lubricants, and cleaners) and to calibration drift after prolonged H2S exposure. Best for indoor industrial, wastewater, telecom, and general confined-space work where silicone and sulfur contaminants are limited.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLEL NDIR (Non-Dispersive Infrared) — $1,322.58:\u003c\/strong\u003e a $100 upsell. Optical detection of hydrocarbons rather than catalytic combustion. Immune to silicone poisoning and H2S-induced calibration drift. Best for oil and gas upstream\/downstream, refining, and any confined-space environment with sour hydrocarbon exposure. NDIR does NOT detect hydrogen — if your confined-space program requires hydrogen alarming alongside the standard four gases, LEL CAT is the right choice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys this bundle:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNew safety programs at facilities standing up confined-space entry procedures — one order gets the crew started\u003c\/li\u003e\n\u003cli\u003eContractors on temporary or seasonal deployments needing a complete, portable monitoring kit\u003c\/li\u003e\n\u003cli\u003eMutual-aid emergency response teams needing grab-and-go four-gas monitoring with the calibration workflow included\u003c\/li\u003e\n\u003cli\u003eMunicipal fire departments and hazmat teams building out gas detection inventory\u003c\/li\u003e\n\u003cli\u003eOil and gas upstream operators on remote sites — the padded case keeps the components together in a truck-bed environment (LEL NDIR variant recommended for sour crude exposure)\u003c\/li\u003e\n\u003cli\u003eWastewater treatment plants adding a confined-space program for lift stations, digester entries, or manhole work\u003c\/li\u003e\n\u003cli\u003eSteel production, ship building, telecom, and manufacturing operations adding four-gas monitoring capability to confined-space entry SOPs\u003c\/li\u003e\n\u003cli\u003ePower generation facilities with turbine hall and boiler entry programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eBundle contents at a glance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePurpose\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWatchGas SST4-MINI 4-Gas Detector\u003c\/td\u003e\n\u003ctd\u003eContinuous LEL \/ O2 \/ CO \/ H2S monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePKCalKit-WG\u003c\/td\u003e\n\u003ctd\u003eCalibration workflow container\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e34L 4-gas calibration gas cylinder\u003c\/td\u003e\n\u003ctd\u003eBump test and calibration gas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e0.5 LPM fixed flow regulator\u003c\/td\u003e\n\u003ctd\u003eDelivers cal gas at the SST4 MINI's diffusion flow rate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTygon tubing (1 foot)\u003c\/td\u003e\n\u003ctd\u003eConnects regulator to monitor's calibration port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eISG padded carrying case (C-100)\u003c\/td\u003e\n\u003ctd\u003eField-portable storage for the kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety services the full WatchGas SST line with factory-trained technicians in-house.\u003c\/strong\u003e When your SST4-MINI's sensor set reaches end-of-life or the unit needs recalibration beyond your on-site capacity, send it to us. We also handle BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand confined-space fleet. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through your confined-space monitoring workflow with someone who understands both the SST4 platform and the calibration ecosystem.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround shipping only.\u003c\/strong\u003e This bundle contains a compressed calibration gas cylinder and must ship UPS Ground per DOT HazMat regulations. Expedited (Next Day \/ 2nd Day Air) shipping is not available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration gas is not returnable.\u003c\/strong\u003e Please confirm your LEL sensor variant choice (CAT vs NDIR) before ordering — the 4-gas mix in the bundle is compatible with both variants, but returns on cal gas cylinders are not permitted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibrate every 3 months and bump test regularly.\u003c\/strong\u003e See \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/How-Often-Do-I-Need-To-Calibrate_e46fd5bf-6e9a-427d-84b9-613e3bb076c5.pdf?v=1722593163\"\u003eHow Often Do I Need To Calibrate My Monitor?\u003c\/a\u003e for the full guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST4 MINI Diffusion):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/SST4-brochure-v1.2.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eBrochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2025\/06\/MKT-SST4-DS-v1.3.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/07\/MKT-SST4-QSG-v1.4.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eQuick Start Guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/11\/SST4-SST4Pump-SST5-MAN-ENG-v1.0.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eSST4-MINI-X_O_H-Y\u003c\/a\u003e — WatchGas SST4-MINI Diffusion 4-Gas Detector (LEL CAT or LEL NDIR variant)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/k-safety-watchgas-equivalent-calibration-kit-pkcalkit-wg\"\u003ePKCalKit-WG\u003c\/a\u003e — PK Safety WatchGas Equivalent Calibration Kit (includes cal gas cylinder, regulator, tubing, and case)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat's included in the WatchGas SST4 MINI Diffusion Bundle?\u003c\/summary\u003e\n\u003cp\u003eSix components in one order:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector — monitors LEL, O2, CO, and H2S continuously, with your choice of LEL CAT or LEL NDIR sensor variant\u003c\/li\u003e\n\u003cli\u003ePK Safety WatchGas Equivalent Calibration Kit (PKCalKit-WG) — automatically discounted $50 when purchased in this bundle\u003c\/li\u003e\n\u003cli\u003e34-liter 4-gas calibration gas cylinder matched to the SST4 MINI's sensor set (LEL \/ O2 \/ CO \/ H2S)\u003c\/li\u003e\n\u003cli\u003eFixed flow regulator at 0.5 LPM — matches the SST4 MINI's diffusion calibration flow rate\u003c\/li\u003e\n\u003cli\u003e1 foot of Tygon tubing for the calibration connection\u003c\/li\u003e\n\u003cli\u003ePadded carrying case (ISG C-100) that keeps all components together for field or truck-bed storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEverything a crew needs to stand up four-gas confined-space monitoring on the day the bundle arrives.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I buy the bundle or the components separately?\u003c\/summary\u003e\n\u003cp\u003eThe bundle saves $50 on the calibration kit (auto-applied at checkout) and delivers everything in one shipment. Buying components separately is worth it only if:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYou already own some of the components (an existing calibration kit, regulator, or cylinder that fits the SST4-MINI's diffusion calibration requirement)\u003c\/li\u003e\n\u003cli\u003eYou need a different gas mix than the standard 4-gas (LEL \/ O2 \/ CO \/ H2S) — for example, a five-gas mix that adds a specialty toxic like SO2 or NH3\u003c\/li\u003e\n\u003cli\u003eYou need a different regulator flow rate than 0.5 LPM (for example, the SST4-PUMP variant needs a different calibration setup)\u003c\/li\u003e\n\u003cli\u003eYou're already running a calibration workflow at a facility and only need the monitor itself\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor new safety programs, temporary contractors, mutual-aid teams, and any buyer standing up a confined-space monitoring capability from scratch, the bundle is faster to receive and simpler to deploy than sourcing components across multiple suppliers.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I choose between LEL CAT and LEL NDIR?\u003c\/summary\u003e\n\u003cp\u003e\u003cstrong\u003eLEL CAT (Catalytic Bead)\u003c\/strong\u003e is the safety industry's standard combustible-gas sensor. It burns a small amount of gas across a heated bead and measures the temperature change. It detects any flammable hydrocarbon vapor and it detects hydrogen. Two caveats: catalytic beads can be poisoned by silicones (found in some caulks, lubricants, cleaners, and mold-release compounds) and their calibration can drift after prolonged H2S exposure. Bump testing catches these drifts, but the sensor is more vulnerable to environmental contaminants than NDIR.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLEL NDIR (Non-Dispersive Infrared)\u003c\/strong\u003e uses an infrared beam and a detector to measure hydrocarbon absorption. It's immune to silicone poisoning and H2S-induced calibration drift, which makes it the better choice for oil and gas upstream\/downstream work, refineries, and any confined-space environment with sour hydrocarbon exposure. One tradeoff: NDIR does not detect hydrogen. If your confined-space program requires hydrogen alarming alongside the standard four gases, LEL CAT is the right choice.\u003c\/p\u003e\n\u003cp\u003eThe $100 price difference between the two bundle variants is the sensor upgrade. If you're doing petroleum or petrochemical work, the NDIR upgrade usually pays for itself in reduced nuisance alarms and calibration drift over the monitor's service life.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does this bundle only ship UPS Ground?\u003c\/summary\u003e\n\u003cp\u003eThe 34-liter calibration gas cylinder in the kit is classified as HazMat under U.S. Department of Transportation (DOT) regulations. HazMat air shipping requires special certifications, packaging, and cost premiums that would double or triple the bundle's landed cost. UPS Ground is the compliant, cost-effective shipping method for this product.\u003c\/p\u003e\n\u003cp\u003eIf you need faster delivery of the monitor and can wait on the calibration kit, you can order the SST4-MINI detector separately (not a HazMat item) and have the calibration kit arrive on Ground timing. Call PK Safety at 800.829.9580 to arrange a split shipment.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow often does this bundle's monitor need calibration and bump testing?\u003c\/summary\u003e\n\u003cp\u003eThe industry standard for portable gas monitors in confined-space service is to bump test before each use (a quick verification that each sensor responds to gas) and to full-calibrate every 3 months (a precise measurement of sensor response against the cal gas standard).\u003c\/p\u003e\n\u003cp\u003eOSHA's confined-space standard 29 CFR 1910.146 does not mandate a specific calibration frequency, but the industry consensus and manufacturer guidance point to the 3-month interval for accuracy assurance and audit-log completeness. Both procedures use the calibration components in this bundle: the 34-liter cal gas cylinder, the 0.5 LPM regulator, and the Tygon tubing.\u003c\/p\u003e\n\u003cp\u003eSee \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/How-Often-Do-I-Need-To-Calibrate_e46fd5bf-6e9a-427d-84b9-613e3bb076c5.pdf?v=1722593163\"\u003eHow Often Do I Need To Calibrate My Monitor?\u003c\/a\u003e for full detail on bump testing and calibration frequency.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes this bundle fit OSHA confined-space entry programs?\u003c\/summary\u003e\n\u003cp\u003eYes. OSHA's permit-required confined spaces standard 29 CFR 1910.146 requires atmospheric testing before entry for oxygen content, flammable gases (measured as % LEL), and toxic gases (typically CO and H2S in industrial contexts). The SST4-MINI in this bundle continuously monitors all four of those parameters, and the included calibration kit provides the workflow to verify sensor accuracy at industry-standard intervals.\u003c\/p\u003e\n\u003cp\u003eFor confined-space programs that need additional gases beyond LEL \/ O2 \/ CO \/ H2S — for example, SO2 at refineries or NH3 at food and beverage plants — a separate single-gas monitor from the WatchGas SST1 line is the right complement to the SST4-MINI in this bundle.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure whether the LEL CAT or LEL NDIR variant fits your work? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the confined-space monitoring workflow will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"LEL CAT\/O2\/CO\/H2S","offer_id":52727929930095,"sku":null,"price":1222.58,"currency_code":"USD","in_stock":true},{"title":"LEL NDIR\/O2\/CO\/H2S","offer_id":52727929962863,"sku":null,"price":1322.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/WatchGas-SST4-MINI-Diffusion-Bundle800x800compressed.jpg?v=1772737925"},{"product_id":"watchgas-induction-cradle-charger-single-desktop-w-adapter","title":"WatchGas Induction Cradle Charger - Single Desktop w\/Adapter","description":"\u003cp\u003e\u003cstrong\u003eEvery safety monitor is only as reliable as the charging system it drops into overnight.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas Induction Cradle Charger is a single-device desktop charging station that keeps your SST4 and SST5 detectors powered and ready to grab. No hunting for chargers. No guessing if a device is charged. Just plug it in, set your detector in the cradle, and move on. Compact enough to sit at a safety-manager's desk or on a calibration bench, and built for the daily industrial use pattern that ends with a monitor at low battery when someone needs it most.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy induction (contactless) charging is the durability upgrade over pin-and-contact chargers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTraditional cradle chargers rely on metal pins meeting metal contacts on the monitor. In field-service and industrial use, those contact points corrode over time — dust, moisture, chemical residue, and repeated seating cycles wear them down until the connection becomes unreliable. A charger that appears to be working but isn't fully seating is the failure mode that ends with a monitor showing low battery at the start of a shift.\u003c\/p\u003e\n\u003cp\u003eInduction charging is contactless. The SST monitor drops into the cradle, the induction coil transfers power through the housing, and there are no pins to corrode, no contacts to wear, and no cleaning required to maintain reliable charging over years of daily use. In a fleet with dozens of monitors and multiple charging cradles, that means fewer overnight-charging surprises and fewer monitors sidelined by cradle failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this charger is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a single-device desktop induction cradle charger for the WatchGas SST4 series (SST4-MICRO, SST4-MINI, SST4-PUMP) and SST5 monitors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e included with an AC power adapter (no separate adapter purchase required).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e designed for fixed desktop deployment — central safety station, calibration bench, or workshop. For vehicle-based charging, see the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-range-wireless-car-charger-sst-car-chg\"\u003eWatchGas SST Range Wireless Car Charger (SST-CAR-CHG)\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the WatchGas SST1 single-gas serviceable line. The SST1 monitors have a different charging system — do not attempt to charge them in this cradle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a multi-device rack. Each cradle charges one detector at a time. For a workshop bench that needs simultaneous charging of multiple monitors, purchase multiple cradles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eApplications and deployment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentral safety stations\u003c\/strong\u003e — the primary use case. Safety office, crew hut, or dispatch area where monitors return between shifts to charge and be inspected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorkshops and maintenance facilities\u003c\/strong\u003e — fleet-service benches where monitors are checked, calibrated, and charged as part of the daily-service routine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService and calibration centers\u003c\/strong\u003e — PK Safety's own service department uses induction cradle chargers to keep customer monitors powered during multi-day service and calibration cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMobile service and inspection fleets\u003c\/strong\u003e — pair with the SST-CAR-CHG for in-vehicle charging when field crews need to top up monitors between site visits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial plants with multiple detectors\u003c\/strong\u003e — refineries, chemical plants, wastewater facilities, and any multi-monitor operation that runs a fleet charging discipline.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContactless induction charging\u003c\/strong\u003e — no pins to corrode, no contacts to wear, no cleaning required to maintain reliable charging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-device desktop form factor\u003c\/strong\u003e — compact footprint fits at a safety-manager's desk, on a calibration bench, or in a workshop\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded AC power adapter\u003c\/strong\u003e — no separate adapter purchase required to put it into service\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with the WatchGas SST4 series and SST5\u003c\/strong\u003e — one charging platform across the multi-gas SST fleet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for fixed, mobile, and temporary installations\u003c\/strong\u003e — wherever a stable power source is available\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-year warranty\u003c\/strong\u003e — standard WatchGas accessory warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for daily industrial use\u003c\/strong\u003e — built for the repetitive-seating cycle a working charging discipline requires\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety supports the WatchGas SST fleet with factory-trained technicians in-house.\u003c\/strong\u003e If a charging cradle stops working, if you're not sure which SST monitor you own, or if you're planning a fleet-scale charging infrastructure across a multi-site operation, call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e. We stock replacement cradles, we can quote multi-unit orders for standardizing a fleet on a single charging platform, and we can talk through the choice between desktop, vehicle, and future WatchGas charging accessories. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST Accessories Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-IND-S — WatchGas Induction Cradle Charger, Single Desktop w\/Adapter (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-IND-S compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-IND-S induction cradle charger is compatible with the WatchGas \u003cstrong\u003eSST4 series\u003c\/strong\u003e and \u003cstrong\u003eSST5\u003c\/strong\u003e monitors. The SST4 series includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eWatchGas SST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is NOT compatible with the WatchGas SST1 single-gas serviceable line — those monitors have a different charging system. If you own an SST1 (SST1-H H2S, SST1-M CO, SST1-O O2, SST1-A NH3, or any other SST1 variant), do not use this cradle. Call PK Safety at 800.829.9580 for the correct SST1 charging accessory.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy induction (contactless) charging instead of a traditional contact charger?\u003c\/summary\u003e\n\u003cp\u003eTraditional cradle chargers use metal pins that touch metal contacts on the monitor to transfer power. Over months and years of daily industrial use, those contact points wear and corrode — dust, moisture, chemical residue, and repeated seating cycles all contribute. When contacts start to fail, the monitor may appear to be charging (a charging light comes on, the cradle looks like it's engaged) but the connection isn't fully complete, and the monitor's battery doesn't fully charge overnight. The failure mode is silent until someone tries to use the monitor and finds it at low battery.\u003c\/p\u003e\n\u003cp\u003eInduction charging is contactless. Power transfers wirelessly through the monitor's housing via a magnetic field. No pins, no contacts, no wear, no cleaning required. In a fleet running dozens of monitors and cradles, this eliminates one of the most common maintenance-driven monitor failures.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDo I need a separate power adapter or is one included?\u003c\/summary\u003e\n\u003cp\u003eThe AC power adapter is INCLUDED with the SST-IND-S. This is the \"w\/Adapter\" variant in the product name — no separate power supply purchase is needed. Plug the adapter into a standard wall outlet, connect the cable to the cradle, and it's ready to charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I charge multiple monitors on one cradle?\u003c\/summary\u003e\n\u003cp\u003eNo. Each SST-IND-S is a single-device cradle — one detector at a time. For a workshop bench, safety station, or calibration center that needs to charge multiple monitors simultaneously, purchase multiple cradles.\u003c\/p\u003e\n\u003cp\u003eIf you're planning a large multi-monitor charging bench (10+ monitors), call PK Safety at 800.829.9580 for a quote — we can advise on standardizing a fleet on a single charging platform and quote multi-unit orders.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I use the SST-IND-S in a vehicle?\u003c\/summary\u003e\n\u003cp\u003eThe SST-IND-S is designed for desktop use with the included AC adapter. For vehicle-based charging — field-service trucks, mobile inspection units, service vans — use the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-range-wireless-car-charger-sst-car-chg\"\u003eWatchGas SST Range Wireless Car Charger (SST-CAR-CHG)\u003c\/a\u003e instead. That variant is engineered for 12V DC vehicle power and the vibration environment of a moving vehicle.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhy does the cradle appear to charge my monitor, but the battery is not at full charge in the morning?\u003c\/summary\u003e\n\u003cp\u003eTwo common causes on any cradle charger (contact or induction):\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeating issue\u003c\/strong\u003e — the monitor is not properly aligned in the cradle. On the induction cradle, the monitor's induction receiver must be positioned over the cradle's induction coil for power transfer to work. Check the alignment; the monitor should sit fully in the cradle recess, not perched on top.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply issue\u003c\/strong\u003e — the AC adapter is not fully plugged in at the wall or the cable is not fully seated at the cradle. Try a different wall outlet and re-seat all cable connections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf neither of those resolves the issue, contact PK Safety at 800.829.9580 with your cradle's serial number — the SST-IND-S is covered by a 2-year warranty and we can walk through diagnostics or arrange a warranty replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow long does a full charge take?\u003c\/summary\u003e\n\u003cp\u003eCharge times vary by SST monitor model and the monitor's starting battery level. Consult the WatchGas monitor manual for your specific model's charge cycle — typical full-charge times for the SST4 series are in the range of 4–6 hours from a fully depleted battery.\u003c\/p\u003e\n\u003cp\u003eFor fleet operations, a standard overnight charge (8+ hours) is well within the full-charge window for any SST monitor — the standard fleet-charging discipline is drop-in-cradle-at-end-of-shift, ready for the next shift.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot sure which SST monitor you own, or planning a fleet-scale charging infrastructure? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the WatchGas SST platform and multi-monitor deployment planning will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52743093387631,"sku":"WG01-SST-IND-S","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-IND-S_and_monitor800x800compressed.jpg?v=1773241866"},{"product_id":"watchgas-sst4-pump-cs-aluminum-case-w-foam-insert","title":"WatchGas SST4-PUMP CS Aluminum Case w\/Foam Insert","description":"\u003cp\u003e\u003cstrong\u003eA confined-space entry team is only as ready as the equipment that arrives on-site — and only as protected as the case that got it there.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST4-PUMP CS Aluminum Case is engineered to carry the complete Confined Space configuration of the SST4-PUMP system in a single grab-and-go package. Custom foam insert holds each item in its own cutout — nothing shifting during transport, nothing knocking against anything else. For field-service crews doing multi-site confined-space work, that's the difference between arriving with a coordinated kit and arriving with a bag of separate items to hunt through.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat fits inside the case:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003e\u003cstrong\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/strong\u003e\u003c\/a\u003e — the pump-drawn monitor itself\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003e\u003cstrong\u003eSST-DFRPSV Demand Flow Regulator\u003c\/strong\u003e\u003c\/a\u003e — professional calibration workflow regulator with Pressure Sensor Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e34-liter cal gas cylinder\u003c\/strong\u003e — dedicated foam cutout for one cylinder (cal gas cylinder sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-induction-cradle-charger-single-desktop-w-adapter\"\u003e\u003cstrong\u003eSST-IND-S Induction Cradle Charger\u003c\/strong\u003e\u003c\/a\u003e — desktop induction cradle for overnight charging\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-ball-float-tubing-not-included-sst-ball-float\"\u003e\u003cstrong\u003eSST-BALL-FLOAT\u003c\/strong\u003e\u003c\/a\u003e — water-intake protection for the sampling tube\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-411-0018-038\"\u003e\u003cstrong\u003eSST-3X5-LASTOMORE Sampling Tubing\u003c\/strong\u003e\u003c\/a\u003e — 3x5mm low-adsorption sampling tubing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eAluminum construction, custom foam, professional-grade transport:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAluminum construction protects a $980+ monitor and its accessories from drops, impacts, dust ingress, and moisture during transport. Custom foam is cut to fit each item's specific shape — no shifting during transport, no compression of vulnerable surfaces like the monitor's display or the regulator's gauge. For field-service crews whose monitors live in a work truck between sites, and for third-party calibration service providers who ship monitors between customers, professional-grade transport is a maintenance-cost decision. The case up-front is materially cheaper than one dropped-and-cracked monitor down the line.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy the complete-kit configuration matters for OSHA-regulated confined-space entry:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOSHA's permit-required confined space rule (29 CFR 1910.146) requires that atmosphere testing equipment be functional and available at the time of entry. The crew arriving on-site with a working monitor, appropriate cal gas, and complete sampling infrastructure is the compliance baseline. A monitor with a cracked display, a leaking cal gas cylinder valve, or missing sampling tubing can defeat entry compliance before the crew even reaches the space. Kit consolidation reduces the failure modes: everything travels together, and if something is missing, you know it before you leave the depot.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this case is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e an aluminum transport case with a custom foam insert engineered specifically for the SST4-PUMP CS (Confined Space) system — the SST4-PUMP monitor and its complete accessory ecosystem.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e compatible with the entire WatchGas SST4-PUMP CS component set: monitor, DFR regulator, 34L cal gas cylinder, induction cradle charger, ball float, and sampling tubing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e sized for other WatchGas monitors (SST4-MICRO, SST4-MINI, or SST1 single-gas). The foam cutout is specifically shaped for the SST4-PUMP form factor. For other monitor cases, call PK Safety at 800.829.9580.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a substitute for the cal gas cylinder, monitor, regulator, or accessories themselves. Each item is sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a certified hazmat transport container. For interstate air transport of cal gas cylinders, consult DOT 49 CFR \/ IATA \/ IMDG requirements — the cal gas concentration determines whether Excepted Quantities provisions apply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum construction\u003c\/strong\u003e — professional-grade transport protection against drops, impacts, dust, and moisture\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom foam insert\u003c\/strong\u003e — each item in its own cutout; no shifting during transport\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete-kit organization\u003c\/strong\u003e — monitor + regulator + cal gas cylinder + charger + ball float + tubing in a single grab-and-go package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngineered for the SST4-PUMP CS Confined Space configuration\u003c\/strong\u003e — specifically shaped foam cutouts for each item\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho buys the SST4-PUMP-CSE-CASE:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfined-space entry contractors\u003c\/strong\u003e — multi-site work across a service territory; kit consolidation = faster on-site setup + fewer forgotten items\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; gas tank entry and turnaround crews\u003c\/strong\u003e — same crew working multiple tank vessels across a plant footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetroleum refinery contractors\u003c\/strong\u003e — unit-shutdown crews with mobile calibration and monitoring across a large plant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural gas utility field service\u003c\/strong\u003e — leak survey and distribution repair crews rotating between service tickets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater collection system service\u003c\/strong\u003e — vault-to-vault entry across a system-wide service route\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmergency response and hazmat teams\u003c\/strong\u003e — first-in crews where every item needs to be in a known location under time pressure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThird-party calibration service providers\u003c\/strong\u003e — mobile cal shops visiting customer sites with a complete calibration kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire department confined-space rescue teams\u003c\/strong\u003e — pre-staged transport kits for rapid deployment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety supports the full WatchGas SST4-PUMP CS Confined Space system\u003c\/strong\u003e — the monitor, the complete accessory ecosystem, and this case that holds it all together. If you're planning a fleet-scale rollout across multiple field-service crews, or building an emergency response equipment cache, call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e. We can quote multi-unit orders across the full CS system, help spec cal gas cylinders for your monitoring targets (LEL \/ O2 \/ CO \/ H2S), and walk through fleet-level maintenance and calibration workflow. Factory-trained technicians in-house for the full WatchGas SST platform. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cem\u003eManufacturer specification documents for this case are available on request — call PK Safety at 800.829.9580.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST4-PUMP-CSE-CASE — WatchGas SST4-PUMP CS Aluminum Case w\/Foam Insert (2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat does 'SST4-PUMP CS' mean, and which items fit inside the case?\u003c\/summary\u003e\n\u003cp\u003e'CS' stands for Confined Space — the complete configuration of the SST4-PUMP system designed for OSHA 1910.146 permit-required confined-space entry workflows. The case's custom foam insert has dedicated cutouts for the entire CS component set:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSST4-PUMP monitor (the pump-drawn 4-gas detector itself)\u003c\/li\u003e\n\u003cli\u003eSST-DFRPSV Demand Flow Regulator (calibration workflow)\u003c\/li\u003e\n\u003cli\u003e34L cal gas cylinder (cal gas sold separately; the case has a dedicated cylinder cutout)\u003c\/li\u003e\n\u003cli\u003eSST-IND-S induction cradle charger (overnight charging)\u003c\/li\u003e\n\u003cli\u003eSST-BALL-FLOAT (water-intake protection for the sampling tube)\u003c\/li\u003e\n\u003cli\u003eSST-3X5-LASTOMORE sampling tubing (3x5mm low-adsorption sample line)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach accessory is sold separately — the case is engineered to hold them, but you assemble the kit from the individual SKUs. Call PK Safety at 800.829.9580 to quote a complete CS system order.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eIs the case included with the SST4-PUMP monitor, or do I buy it separately?\u003c\/summary\u003e\n\u003cp\u003eThe SST4-PUMP-CSE-CASE is sold separately from the SST4-PUMP monitor and all its accessories. Each item in the CS system is a separate SKU. If you're purchasing an SST4-PUMP monitor and expect a case to be included, verify with your PK Safety rep before ordering — different WatchGas SST4-PUMP configurations may ship with or without the case depending on the package.\u003c\/p\u003e\n\u003cp\u003eFor a complete CS system order (monitor + regulator + case + accessories + cal gas cylinder), call PK Safety at 800.829.9580 for a bundled quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I use this case with a different WatchGas monitor (SST4-MICRO, SST4-MINI, SST5)?\u003c\/summary\u003e\n\u003cp\u003eNo. The foam insert is custom-cut specifically for the SST4-PUMP form factor and its CS accessory set. The SST4-MICRO and SST4-MINI have different shapes and different accessory ecosystems (diffusion monitors don't need a ball float or sampling tubing, for instance), and the SST5 is a different monitor entirely.\u003c\/p\u003e\n\u003cp\u003eFor transport cases for other WatchGas monitors, call PK Safety at 800.829.9580.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eIs the case safe for airline or interstate transport of the cal gas cylinder?\u003c\/summary\u003e\n\u003cp\u003eSmall compressed gas cylinders (34L cal gas cylinders fall in this category) are subject to DOT 49 CFR, IATA (air), and IMDG (sea) transport regulations. Most cal gas concentrations qualify for the Excepted Quantities provisions in 49 CFR 173.4 (small quantity exception), and for airline transport specific IATA Excepted Quantity documentation is required.\u003c\/p\u003e\n\u003cp\u003eThe SST4-PUMP-CSE-CASE is engineered as a professional-grade transport case, but it is NOT a certified hazmat transport container. For interstate air transport or ocean shipping of cal gas cylinders, verify with your cal gas supplier that your specific cylinder qualifies for Excepted Quantities transport, and consult a hazmat shipping specialist for documentation and labeling requirements.\u003c\/p\u003e\n\u003cp\u003eFor everyday over-the-road transport in a service vehicle (utility truck, service van, fleet vehicle), the case provides appropriate physical protection for normal operational transport.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eIs the foam insert washable or replaceable?\u003c\/summary\u003e\n\u003cp\u003eCustom foam inserts can typically be cleaned with mild soap and water and air-dried before returning items to the case. For replacement foam inserts (in case of contamination, cal gas exposure damage, or physical wear), call PK Safety at 800.829.9580 — replacement foam is available from WatchGas as a service part.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat are the exterior dimensions of the case?\u003c\/summary\u003e\n\u003cp\u003eExact case dimensions are documented in the WatchGas specification documents. If you need dimensions for fleet vehicle space planning or shelving fit before ordering, call PK Safety at 800.829.9580 and we'll provide the current spec.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I add the case to an SST4-PUMP order I've already placed?\u003c\/summary\u003e\n\u003cp\u003eAbsolutely — the case is a common add-on for SST4-PUMP orders, especially for field-service and multi-site deployment scenarios. Call PK Safety at 800.829.9580 to add it to an in-flight order or to bundle it with a future accessory purchase.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eBuilding an SST4-PUMP CS Confined Space system across a fleet, or ordering a complete-kit case with your first SST4-PUMP purchase? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the WatchGas SST4-PUMP CS system, cal gas cylinder specification, and fleet transport logistics will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52743110656367,"sku":"WG01-SST4-PUMP-CSE-CASE","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/CS-Aluminum-Case-open800x800compressed.jpg?v=1773173067"},{"product_id":"watchgas-ball-float-tubing-not-included-wg-7182112","title":"WatchGas Ball Float (Tubing NOT Included) WG-7182112","description":"\u003cp\u003e\u003cstrong\u003eA drifting sensor is a bad day. A pump full of water is a very bad day.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYour confined space clearance depends on clean, unobstructed sampling. An exposed hose opening invites disaster — dust clogs the line, liquid ingestion damages the pump, and contamination corrupts your readings. The WatchGas Ball Float stands guard. The ball floats on the water surface, and when the intake approaches water, the ball rises and blocks the opening before any liquid enters the sampling tube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy this matters for pump-drawn sampling in wet confined spaces:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePump-drawn sampling in confined spaces routinely involves water. Wet wells, flooded vaults, tanks with residual liquid at the bottom, sumps, bilges, ballast tanks — the crew samples the atmosphere ABOVE standing water before entry. When a pump ingests water, the sampling pump can be damaged, the sensor manifold can be contaminated, and calibration is compromised. Worst case, the monitor goes silent while the crew is still relying on it — the failure isn't discovered until the next bump test. OSHA's permit-required confined space rule (29 CFR 1910.146) requires continuous monitoring during entry. A monitor whose pump is disabled by water ingestion cannot fulfill that requirement. The ball float is the low-cost accessory that protects the equipment that protects the entry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngineered as a single, unified piece\u003c\/strong\u003e, this ball float delivers toughness that surpasses traditional two-part designs held together by adhesive — no failure line where two halves can separate under thermal stress or repeated field use. The material resists chemicals, repels static (relevant for flammable-atmosphere sampling per API RP 2003), and refuses to absorb contaminants that would skew your measurements. Its bold yellow color cuts through shadows, keeping your equipment instantly recognizable in low-light confined-space conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat this accessory is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a single-piece plastic ball float that installs at the intake end of a pump-drawn sampling tube on the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e designed to work with 3x5mm WatchGas sampling tubing (SST-3X5-LASTOMORE) — \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-411-0018-038\"\u003esold separately by the meter\u003c\/a\u003e. Tubing is NOT included with the ball float.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e part of a pump-drawn sampling ecosystem that also includes the WatchGas Demand Flow Regulator (SST-DFRPSV) for calibration workflow support — same 3x5mm tubing standard across the ecosystem.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the SST4-MICRO (diffusion), SST4-MINI (diffusion), or SST1 single-gas monitors. Those are diffusion monitors, not pump-drawn — no sampling tube, no ball float needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a substitute for a properly-executed atmosphere-testing procedure. Continuous monitoring, bump testing, and calibration discipline still apply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-piece construction\u003c\/strong\u003e — no adhesive-joined failure line, no two-half separation risk\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical resistance\u003c\/strong\u003e — survives contact with the mixed atmospheres and residues typical of tank entry and wastewater work\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-static\u003c\/strong\u003e — relevant for flammable-atmosphere sampling (API RP 2003 context)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-absorbent\u003c\/strong\u003e — does not soak up contaminants that would carry over between sampling events and skew subsequent readings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-visibility yellow\u003c\/strong\u003e — recognizable in low-light confined spaces; recoverable if dropped\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with WatchGas 3x5mm sampling tubing\u003c\/strong\u003e — sold separately (see cross-reference above)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eApplications and deployment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater collection system entry\u003c\/strong\u003e — wet wells, headworks, junction boxes with variable water levels. Water intake is the standard hazard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; gas tank entry\u003c\/strong\u003e (API RP 2016 workflows) — residual liquid at tank bottoms is common; sampling above it is routine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine vessel confined-space entry\u003c\/strong\u003e — ballast tanks (water by design), bilges, engine-room sumps, cargo holds with residual water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUtility vault entry contractors\u003c\/strong\u003e (water, sewer, storm drain, some telecom vaults) — flooded or partially-flooded vaults are common in older infrastructure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetroleum refinery unit shutdowns\u003c\/strong\u003e — process equipment often has residual liquid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfined-space rescue teams\u003c\/strong\u003e — wet-space rescue is a distinct sub-discipline of confined-space rescue (NFPA 1670)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLandfill and biogas operators\u003c\/strong\u003e — gas collection infrastructure with leachate handling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePK Safety supports the full WatchGas SST4-PUMP sampling ecosystem\u003c\/strong\u003e — the ball float, the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003eDemand Flow Regulator w\/Pressure Sensor Valve (SST-DFRPSV)\u003c\/a\u003e for calibration workflows, and the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-sst-3x5-lastomore\"\u003eLast-O-More 3x5mm Sampling Tubing (SST-3X5-LASTOMORE)\u003c\/a\u003e for the sample-line itself. Factory-trained technicians in-house for the full WatchGas SST platform. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's pump-drawn sampling infrastructure. Call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e to talk through a wet-confined-space sampling workflow or to order the full three-part accessory set.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST-BALL-FLOAT):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/WatchGas-Ball-Float-v3.2-23.10.24.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG-7182112 — WatchGas Ball Float, single-piece, 3x5mm tubing compatible (tubing NOT included, 2-year warranty)\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat does a ball float do in a pump-drawn sampling setup?\u003c\/summary\u003e\n\u003cp\u003eThe ball float is a physical safety device that prevents water and liquid ingestion into a pump-drawn gas monitor's sampling system. It sits at the far end of the sampling tube (the end that goes into the confined space, tank, or vault). When the tube's intake approaches standing water, the ball floats on the water surface. As the water rises up around the ball, the ball rises to the top of its housing and physically blocks the sampling tube's intake opening — no water enters the tube, and the pump downstream is protected.\u003c\/p\u003e\n\u003cp\u003eWithout a ball float, an accidental water intake damages the sampling pump, contaminates the sensor manifold, and often ruins calibration. The monitor may continue to display readings that appear normal but that are no longer accurate. The failure is usually discovered at the next bump test — sometimes days after the actual water intake event.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-BALL-FLOAT compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-BALL-FLOAT is designed for pump-drawn sampling on the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e — the only pump-drawn monitor in the WatchGas SST4 family.\u003c\/p\u003e\n\u003cp\u003eIt is NOT applicable to the SST4-MICRO (diffusion), SST4-MINI (diffusion), or SST1 single-gas monitors — those monitors have no sampling tube, so no ball float is needed. If you're not certain whether your SST4 monitor is a diffusion or a pump variant, check the product label or invoice. The pump variant is explicitly named 'SST4-PUMP' — the MICRO and MINI are diffusion.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhich sampling tube does the ball float work with, and is it included?\u003c\/summary\u003e\n\u003cp\u003eThe ball float is designed to fit \u003cstrong\u003e3x5mm WatchGas sampling tubing\u003c\/strong\u003e — specifically the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-sst-3x5-lastomore\"\u003eWatchGas Last-O-More Tubing 3x5mm (SST-3X5-LASTOMORE)\u003c\/a\u003e, sold separately by the meter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe tubing is NOT included\u003c\/strong\u003e with the ball float — the accessories are sold separately so you can specify exactly the tube length you need for your sampling depth. For most confined-space entry workflows, a 3–5 meter length is standard.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat happens if I don't use a ball float and my monitor pumps water?\u003c\/summary\u003e\n\u003cp\u003eWater in the pump-drawn sampling system typically produces one or more of these failure modes, often silently:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSampling pump damage\u003c\/strong\u003e — diaphragm pumps and micro-pumps can be damaged by liquid ingestion. Pump replacement or full monitor service may be required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor contamination\u003c\/strong\u003e — water carries dissolved contaminants that can foul electrochemical sensor faces or the LEL sensor. The monitor may still power on but read incorrectly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration drift\u003c\/strong\u003e — a contaminated sensor will fail its next bump test or calibration. Depending on severity, the sensor may need replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilent failure of the monitoring workflow\u003c\/strong\u003e — the most dangerous outcome. The crew continues to rely on a monitor that appears functional but is no longer providing accurate readings. This is what OSHA 1910.146's continuous-monitoring requirement is intended to prevent, and it's what the ball float is engineered to protect against.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe $30 accessory is protecting a $980+ monitor and the confined-space entry it supports. It's one of the highest-ROI accessory purchases in the WatchGas SST catalog.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhy single-piece construction instead of two-piece?\u003c\/summary\u003e\n\u003cp\u003eTraditional ball floats are often built as two half-spheres held together by adhesive. Under thermal cycling (going from cold storage to warm confined-space temperatures repeatedly), repeated field use, and exposure to chemicals in the sampled atmosphere, the adhesive bond can weaken and the two halves can separate — sometimes catastrophically at exactly the wrong moment.\u003c\/p\u003e\n\u003cp\u003eThe WatchGas ball float is engineered as a single, unified piece. No adhesive line, no two-half separation risk, no thermal-cycling failure mode. It's a durability upgrade over the industry standard.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow do I attach the ball float to my sampling tube?\u003c\/summary\u003e\n\u003cp\u003eThe ball float is designed to slip-fit over the intake end of a 3x5mm WatchGas sampling tube — no adhesive, no clamp, no special tool required. The fit is engineered to be secure through normal deployment but easy to remove for cleaning or replacement between jobs.\u003c\/p\u003e\n\u003cp\u003eConsult the WatchGas Specification Sheet (linked above) for the exact assembly diagram, or call PK Safety at 800.829.9580 if you want to talk through the sampling-tube-plus-ball-float setup with a factory-trained technician.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow does the ball float fit into the full WatchGas SST4-PUMP sampling ecosystem?\u003c\/summary\u003e\n\u003cp\u003eThe pump-drawn sampling ecosystem for the SST4-PUMP includes three complementary WatchGas accessories, each sold separately:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWG-7182112\u003c\/strong\u003e (this SKU) — water intake protection at the sampling-tube intake end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003eSST-DFRPSV Demand Flow Regulator\u003c\/a\u003e\u003c\/strong\u003e — calibration workflow accessory that regulates gas flow from calibration cylinders during bump tests and full calibrations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-last-o-more-tubing-3x5mm-sst-3x5-lastomore\"\u003eSST-3X5-LASTOMORE Sampling Tubing\u003c\/a\u003e\u003c\/strong\u003e — the 3x5mm tube itself, sold by the meter for length flexibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor a complete confined-space sampling setup on a WatchGas SST4-PUMP, order all three. Call PK Safety at 800.829.9580 for a bundle quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp\u003e\u003cstrong\u003ePlanning a wet-confined-space sampling workflow, or ordering the full SST4-PUMP sampling accessory set? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the WatchGas SST platform and pump-drawn sampling workflow will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52745837838703,"sku":"WG01-WG-7182112","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/Ballfloat_no_hose800x800compressed.jpg?v=1773246226"},{"product_id":"watchgas-last-o-more-tubing-3x5mm-411-0018-038","title":"WatchGas Last-O-More Tubing 3x5mm SST-3X5","description":"\u003cp\u003e\u003cstrong\u003eAccurate gas sampling depends on what the tube is made of — not just what's coming through it.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas Last-O-More Tubing 3x5mm is professional-grade sampling tubing for pump-drawn gas monitoring. Low-adsorption material means the atmosphere you sample and the atmosphere the sensor sees stay in agreement. Anti-tangle coating keeps deployment quick and predictable in the field. Sold by the meter — order the length you need for your sampling application.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy tubing material matters for accurate gas sampling:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen you sample reactive gases through a length of tubing, the tube itself becomes part of the sampling system. Some tubing materials adsorb gas molecules on the way through — hydrogen sulfide, ammonia, sulfur dioxide, phosphine, and many volatile organic compounds all partially stick to standard silicone or common polymer tubing. On short sample runs, that adsorption produces false-low readings while the reactive gas is still saturating the tube walls. On repeated bump tests, adsorbed residual gas can bleed out of the walls of a previously-used tube and skew subsequent measurements.\u003c\/p\u003e\n\u003cp\u003eProfessional sampling tubing is engineered to minimize this adsorption behavior. Last-O-More is WatchGas's low-adsorption tubing line — engineered specifically to keep the atmosphere you sample and the atmosphere the sensor sees in as close agreement as possible. For OSHA 1910.146 permit-required confined space entry work, that agreement is the entire point of the atmosphere test.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eResponse-time delay: how tubing length affects your monitor reading.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEvery meter of sampling tubing adds a fraction of a second to the sample response time — the time between when contaminated atmosphere enters the tube and when the monitor's sensor sees it. For short tubing runs (1–3 meters), the delay is negligible. For longer runs (7–10 meters, common for deep tank sampling), the delay becomes meaningful, and it matters for how you interpret bump-test timing, alarm response expectations, and evacuation lead time.\u003c\/p\u003e\n\u003cp\u003eWatchGas specifies an effective maximum sample tube length of approximately 7.5 meters (25 feet) for the SST4-PUMP. Beyond that length, the sampling pump cannot reliably pull sample at the monitor's design flow rate, and readings can become unreliable. If you need longer sample runs than that, call PK Safety at 800.829.9580 — there are workarounds for extreme-reach sampling but they require adapting the monitoring workflow rather than just adding more tubing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this tubing is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e professional-grade 3x5mm (3mm inner diameter, 5mm outer diameter) low-adsorption sampling tubing engineered for the WatchGas SST4-PUMP pump-drawn sampling workflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e compatible with the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-ball-float-tubing-not-included-sst-ball-float\"\u003eWatchGas Ball Float (SST-BALL-FLOAT)\u003c\/a\u003e — the ball float is designed to slip-fit over the intake end of this tubing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e part of the WatchGas SST4-PUMP sampling ecosystem alongside the SST-BALL-FLOAT (water-intake protection) and the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003eSST-DFRPSV Demand Flow Regulator\u003c\/a\u003e (calibration workflow).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e for use with diffusion monitors (SST4-MICRO, SST4-MINI, SST1) — those monitors don't sample through a tube. They rely on ambient gas diffusion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a substitute for proper atmosphere-testing procedure. Sample-line length, purge-time discipline, and periodic tubing replacement (recommended when contaminated or when switching between reactive-gas applications) still apply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-adsorption material\u003c\/strong\u003e — minimizes gas molecule uptake by tube walls; more accurate readings for reactive gases (H2S, NH3, SO2, PH3) and VOCs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-tangle coating\u003c\/strong\u003e — quick deployment, less field frustration, safer sample-line handling at the mouth of a confined space\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x5mm dimensions\u003c\/strong\u003e — 3mm inner diameter, 5mm outer diameter; industry-standard small-bore sampling tubing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the meter\u003c\/strong\u003e — order the exact length needed for your sampling application. Common lengths: 3m (utility vault entry), 5m (industrial tank entry), 7m (deep tank \/ max spec).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with the WatchGas Ball Float (SST-BALL-FLOAT)\u003c\/strong\u003e — slip-fit connection at the intake end\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional-grade at accessible pricing\u003c\/strong\u003e — $16\/meter positions this tubing within reach of every SST4-PUMP owner, not just professional cal shops\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow much tubing to buy:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1–3 meters:\u003c\/strong\u003e desktop calibration bench, short-reach sampling, general utility work\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3–5 meters:\u003c\/strong\u003e standard confined-space entry (utility vaults, sewer, shallow tanks)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5–7 meters:\u003c\/strong\u003e deep tank entry (petroleum storage tanks, some wastewater applications, marine vessel holds)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum ~7.5 meters (25 feet):\u003c\/strong\u003e WatchGas specified upper limit for SST4-PUMP effective sampling. Longer runs risk unreliable pump performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFleet operators typically buy in longer lengths and cut to specific job requirements — order a spool that covers your longest expected sample run plus a service margin.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety supports the full WatchGas SST4-PUMP sampling ecosystem\u003c\/strong\u003e — the ball float, the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003eDemand Flow Regulator w\/PSV (SST-DFRPSV)\u003c\/a\u003e, and this low-adsorption sampling tubing. For a complete sampling workflow order, or to talk through longer-than-standard sample runs, call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e. Factory-trained technicians in-house for the full WatchGas SST platform. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet's sampling infrastructure.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas Last-O-More):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2024\/10\/Last-O-More-DS-v-3.2-23.10.24.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-411-0018-038 — WatchGas Last-O-More 3x5mm Sampling Tubing (sold by the meter, 2-year warranty)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat makes Last-O-More tubing different from generic sampling tubing?\u003c\/summary\u003e\n\u003cp\u003eTwo properties matter for professional gas sampling, and Last-O-More is engineered for both:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow adsorption\u003c\/strong\u003e — the tubing wall material minimizes gas molecule uptake as sample passes through. This matters most for reactive gases (H2S, NH3, SO2, PH3, some VOCs) that partially adsorb to standard silicone or generic polymer tubing. Adsorption produces false-low readings on short sample runs and can bleed carryover into subsequent readings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-tangle coating\u003c\/strong\u003e — field-practical property. Sampling tubing that tangles in a bag or coil wastes time at exactly the wrong moment (pre-entry atmosphere testing when the crew is on the clock).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTogether, these mean the atmosphere your monitor reads is closer to the atmosphere you actually sampled, and setup is faster and less frustrating.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow much tubing do I need for my sampling application?\u003c\/summary\u003e\n\u003cp\u003eTypical length guidance:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1–3 meters:\u003c\/strong\u003e desktop calibration bench, short-reach sampling, general utility work\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3–5 meters:\u003c\/strong\u003e standard confined-space entry (utility vaults, sewer, shallow tanks)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5–7 meters:\u003c\/strong\u003e deep tank entry (petroleum storage tanks, some wastewater applications, marine vessel holds)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum ~7.5 meters (25 feet):\u003c\/strong\u003e WatchGas specified upper limit for SST4-PUMP effective sampling. Beyond this, the pump cannot reliably pull sample at the design flow rate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFleet operators typically buy longer lengths and cut to specific job requirements — order a spool that covers your longest expected sample run plus a service margin.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does response time change with tubing length?\u003c\/summary\u003e\n\u003cp\u003eEvery meter of sampling tubing adds a fraction of a second to sample response time — the delay between when the contaminated atmosphere enters the tube and when the monitor's sensor sees it. Rough guidance:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1–3 meters:\u003c\/strong\u003e delay is negligible for practical purposes; bump-test timing is essentially instantaneous\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3–7 meters:\u003c\/strong\u003e delay is measurable (typically 3–10 seconds depending on pump flow rate); factor into bump-test timing expectations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBeyond 7.5 meters:\u003c\/strong\u003e outside WatchGas SST4-PUMP specification. Pump flow may become unreliable, and delay compounds unpredictably.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor alarm response and evacuation lead time in continuous monitoring, be aware that a monitor at the end of a 7-meter tube is responding to atmosphere that entered the tube ~5–10 seconds earlier. In fast-changing atmospheres, that latency matters.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDoes the Last-O-More tubing work with the WatchGas Ball Float and Demand Flow Regulator?\u003c\/summary\u003e\n\u003cp\u003eYes. All three accessories are engineered as a coordinated sampling ecosystem:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-ball-float-tubing-not-included-sst-ball-float\"\u003e\u003cstrong\u003eSST-BALL-FLOAT\u003c\/strong\u003e\u003c\/a\u003e slip-fits over the intake end of this tubing to prevent water ingestion during wet confined-space entry\u003c\/li\u003e\n\u003cli\u003eThe Last-O-More tubing itself carries the sample from the space to the monitor\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-demand-flow-regulator-w-pressure-sensor-valve\"\u003e\u003cstrong\u003eSST-DFRPSV Demand Flow Regulator\u003c\/strong\u003e\u003c\/a\u003e uses the same 3x5mm tubing standard for cal gas delivery during bump tests and calibrations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 for a complete sampling ecosystem quote covering all three accessories.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow do I cut the tubing to length and terminate the ends?\u003c\/summary\u003e\n\u003cp\u003eCut with a sharp utility knife or dedicated tubing cutter for a clean square end. Avoid scissors or pliers — those tend to crush the tube and can cause a leak at the connection point.\u003c\/p\u003e\n\u003cp\u003eTerminations depend on what's on each end:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake end\u003c\/strong\u003e (going into the confined space): if you're using the SST-BALL-FLOAT, the ball float slip-fits over the tube end. Otherwise, leave the end square-cut.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonitor end\u003c\/strong\u003e: the tube slip-fits onto the SST4-PUMP sample port. Consult the SST4-PUMP manual for correct orientation and depth.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStore cut lengths in a clean container to keep debris from entering the tube walls between uses.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eDo I need to replace tubing between different sampling applications?\u003c\/summary\u003e\n\u003cp\u003eGuidance depends on what you've been sampling:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetween similar non-reactive sampling\u003c\/strong\u003e (e.g., LEL testing across multiple utility vaults on the same day): the same tubing is fine. Cleaning is optional.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetween reactive-gas exposure and subsequent readings\u003c\/strong\u003e (e.g., after sampling an H2S-rich atmosphere): purge the tube by drawing clean air through it for 30–60 seconds before the next reading. If you've been exposed to high concentrations, consider replacing the tubing entirely — residual adsorbed gas can bleed out for hours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetween different reactive gases\u003c\/strong\u003e (e.g., H2S sampling followed by NH3 sampling): replace the tubing. Cross-contamination in reactive-gas sampling is difficult to fully purge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeriodically as preventive maintenance\u003c\/strong\u003e: replace tubing every 6–12 months of active use, or sooner if the tubing shows signs of contamination, discoloration, or physical damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is this tubing compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe Last-O-More 3x5mm tubing is designed for pump-drawn sampling on the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e — the only pump-drawn monitor in the WatchGas SST4 family.\u003c\/p\u003e\n\u003cp\u003eIt is NOT for use with the SST4-MICRO (diffusion), SST4-MINI (diffusion), or SST1 single-gas monitors. Those monitors don't sample through a tube — they rely on ambient gas diffusion to reach the sensors.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003eOrdering the full WatchGas SST4-PUMP sampling ecosystem, or planning a fleet-scale sampling deployment across multiple job sites? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the WatchGas SST platform and pump-drawn sampling workflow will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52745837904239,"sku":"WG01-411-0018-038","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/sampling-hose800x800compressed.jpg?v=1773247149"},{"product_id":"watchgas-sst-range-wireless-car-charger-sst-car-chg","title":"WatchGas SST Range Wireless Car Charger SST-CAR-CHG","description":"\u003cp\u003e\u003cstrong\u003eWhen your safety monitors live in a truck, the charging system has to live in the truck too.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe WatchGas SST Range Wireless Car Charger keeps your gas detectors powered and ready in the field. No cables, no hassle. Auto-clamping holds your detector secure through rough terrain and vehicle vibration, while smart protection guards against overcharging and overheating in a hot truck cabin. Multiple mounting options and dual power inputs fit any vehicle, and fast charging in 3–5 hours means monitors are topped up between job sites, not sidelined between shifts.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQi-certified induction charging: the mainstream wireless-charging protocol, engineered for professional field use.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SST-CAR-CHG uses Qi-certified induction charging — the same industry-standard wireless-charging protocol you find on modern smartphones, laptops, and hospital medical equipment. Qi certification means the charger has been tested and certified by the Wireless Power Consortium to meet safety standards for power transfer efficiency, thermal management, and foreign-object detection. In a professional safety application, where the equipment sits in a hot truck cabin all day and gets seated and unseated dozens of times during a shift, those safety guarantees are the reason wireless charging can be trusted for mission-critical equipment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat this charger is (and isn't):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e a Qi-certified wireless (induction) vehicle charger for the WatchGas SST4 series (SST4-MICRO, SST4-MINI, SST4-PUMP) and SST5 monitors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e engineered for the vehicle environment — auto-clamping to hold the monitor secure through vibration and rough terrain, smart overcharge and overheat protection for hot-cabin conditions, and dual power inputs for wiring flexibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt IS\u003c\/strong\u003e the mobile companion to the \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-induction-cradle-charger-single-desktop-w-adapter\"\u003eWatchGas SST-IND-S Induction Cradle Charger\u003c\/a\u003e (desktop variant). A common fleet deployment runs SST-IND-S at the central safety station for overnight full-fleet charging and SST-CAR-CHG in each field-service truck for topping up between site visits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e compatible with the WatchGas SST1 single-gas serviceable line. The SST1 monitors have a different charging system — do not attempt to charge them in this cradle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is NOT\u003c\/strong\u003e a multi-device rack. Each cradle charges one detector at a time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQi-certified wireless induction charging\u003c\/strong\u003e — mainstream protocol, tested and certified for power transfer, thermal management, and foreign-object detection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-clamping cradle\u003c\/strong\u003e — secures the monitor mechanically through rough terrain and vehicle vibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOvercharge and overheat protection\u003c\/strong\u003e — critical for equipment in a hot vehicle cabin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple mounting options + dual power inputs\u003c\/strong\u003e — fits different vehicle configurations and wiring layouts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast charging in 3–5 hours\u003c\/strong\u003e — shorter than a typical field-service workday, so monitors are topped up between sites\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with the WatchGas SST4 series and SST5\u003c\/strong\u003e — same monitor compatibility as the desktop SST-IND-S; monitors interchange between vehicle and safety-station charging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUser-friendly workflow\u003c\/strong\u003e — drop-in, seat, done. Consistent charging behavior means field crews don't have to think about charging discipline.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eApplications and deployment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural gas utility field service\u003c\/strong\u003e — leak survey trucks, meter-set service vehicles, distribution repair crews\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; gas field service and lease operators\u003c\/strong\u003e — wellhead check-ins, tank battery inspections, pumper routes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefinery contractor service vehicles\u003c\/strong\u003e — turnaround crews with mobile calibration and monitoring across a large plant footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater collection system service\u003c\/strong\u003e — vault-to-vault confined-space entry with mobile monitor charging between sites\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUtility confined-space entry contractors\u003c\/strong\u003e (water, telecom, electric) — mobile crews doing vault entries across a service territory\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmergency response and hazmat teams\u003c\/strong\u003e — first-in vehicles where monitors need to be ready and charged on arrival\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMobile inspection and audit fleets\u003c\/strong\u003e — safety consultants, insurance auditors, third-party compliance inspectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePK Safety supports the WatchGas SST fleet with factory-trained technicians in-house.\u003c\/strong\u003e If your team is planning a mobile charging deployment across multiple service vehicles, or you're rolling out a mixed-fleet strategy (SST-IND-S at central safety stations + SST-CAR-CHG in trucks), call us at \u003cstrong\u003e800.829.9580\u003c\/strong\u003e. We can quote multi-unit orders, help spec vehicle wiring compatibility, and answer any questions on Qi charging behavior in vehicle environments. We also service BW\/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet.\u003c\/p\u003e\n\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical documents (WatchGas SST-CAR-CHG):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSST Accessories Brochure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/02\/WatchGas-SST-Range-Wireless-Vehicle-Charger-DS-EN-V1.1L1E.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eSpecification Sheet\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/02\/SST-Wireless-Vehicle-Charger-QSG-v1.3L1E.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003cstrong\u003eManual (Quick Start Guide)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e WG01-SST-CAR-CHG — WatchGas SST Range Wireless Car Charger (Qi-certified induction)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhich WatchGas monitors is the SST-CAR-CHG compatible with?\u003c\/summary\u003e\n\u003cp\u003eThe SST-CAR-CHG is compatible with the WatchGas \u003cstrong\u003eSST4 series\u003c\/strong\u003e and \u003cstrong\u003eSST5\u003c\/strong\u003e monitors — the same monitor set as the desktop \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-induction-cradle-charger-single-desktop-w-adapter\"\u003eSST-IND-S cradle charger\u003c\/a\u003e. The SST4 series includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\"\u003eWatchGas SST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\"\u003eWatchGas SST4-PUMP 4-Gas Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is NOT compatible with the WatchGas SST1 single-gas serviceable line — those monitors have a different charging system.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eWhat is Qi-certified charging, and why does it matter?\u003c\/summary\u003e\n\u003cp\u003eQi (pronounced \"chee\") is the industry-standard wireless-charging protocol maintained by the Wireless Power Consortium (WPC). It's the same standard used by modern smartphones, laptops, hospital medical equipment, and now professional safety monitors.\u003c\/p\u003e\n\u003cp\u003eQi certification means the charger has been independently tested and verified to meet WPC safety standards for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower transfer efficiency\u003c\/strong\u003e — how much of the input power actually reaches the monitor's battery vs being lost to heat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal management\u003c\/strong\u003e — the charger will not overheat during normal operation or when the monitor is left in place longer than the standard charge cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForeign-object detection\u003c\/strong\u003e — the charger detects if a metal object (a coin, a key, a paperclip) has been placed on the cradle and will not attempt to transfer power in that scenario\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor professional safety equipment that lives in a hot truck cabin all day and gets seated and unseated dozens of times per shift, those safety guarantees are the reason wireless charging can be trusted for mission-critical equipment. A non-certified wireless charger might work fine most of the time, but there's no independent verification that it won't overheat or misbehave under the edge conditions field-service equipment sees.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow does the auto-clamping mechanism work — can it damage the monitor?\u003c\/summary\u003e\n\u003cp\u003eThe auto-clamping cradle uses a spring-loaded mechanism that gently secures the monitor when it's seated in the cradle and releases automatically when the monitor is lifted out. It's designed for the vibration and rough terrain of a service vehicle — without auto-clamping, a monitor could bounce out of the cradle on a rough road and either damage itself or lose charging contact.\u003c\/p\u003e\n\u003cp\u003eThe clamping force is calibrated to hold the monitor firmly without damaging the housing or the charging surface. It's the same principle as a magnetic phone mount, but engineered for the higher-vibration environment of a work truck.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eCan I use the SST-CAR-CHG with a 24V truck battery?\u003c\/summary\u003e\n\u003cp\u003eConsult the Specification Sheet (linked above) for the exact voltage range. Most WatchGas SST vehicle chargers are designed for 12V DC vehicle power, which covers standard pickup trucks, service vans, and passenger vehicles. Heavy-duty commercial vehicles with 24V electrical systems may require a step-down converter or a different mounting approach.\u003c\/p\u003e\n\u003cp\u003eIf you're wiring the SST-CAR-CHG into a 24V truck, call PK Safety at 800.829.9580 with your vehicle year, make, and model — we can walk through the wiring options and confirm compatibility before you install.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eIs this charger safe to leave in a hot vehicle in summer?\u003c\/summary\u003e\n\u003cp\u003eQi-certified chargers include thermal management as part of the certification, and the SST-CAR-CHG's smart protection layer adds overcharge and overheat safeguards on top. That said, extreme cabin temperatures (\u0026gt;140°F \/ 60°C) are hard on any electronics — the monitor itself as much as the charger — and are best avoided when possible.\u003c\/p\u003e\n\u003cp\u003ePractical guidance: if the truck is parked in direct sun on a hot day, use a sunshade or park in shade when practical. If the monitor is going to sit in the cabin for extended periods in extreme heat, remove it from the cradle. This is the same guidance as for smartphones and other Qi-charged equipment in vehicles.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eShould I run SST-IND-S at base and SST-CAR-CHG in the truck?\u003c\/summary\u003e\n\u003cp\u003eYes — that's the standard mixed-fleet-charging deployment pattern for field-service operations, and it's what the two accessories are engineered for.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSST-IND-S (desktop, at central safety station)\u003c\/strong\u003e — overnight full-fleet charging. Every monitor returns to the safety station at end of shift, drops into a desktop cradle, and is at full charge for the next morning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSST-CAR-CHG (in each service truck)\u003c\/strong\u003e — mid-shift topping up between job sites. Field crews plug in a monitor after a confined-space entry or a leak survey, drive to the next site, and arrive with a topped-up battery.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBoth use Qi-certified induction charging on the same monitor platform, so a monitor is agnostic to which cradle it drops into. This means fleet managers can standardize on a single charging protocol across desktop and vehicle deployments, which simplifies training and maintenance.\u003c\/p\u003e\n\u003cp\u003eCall PK Safety at 800.829.9580 to quote a mixed-fleet order across service trucks and central safety stations.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails open\u003e\n\u003csummary\u003eHow long does a full charge take?\u003c\/summary\u003e\n\u003cp\u003eApproximately 3–5 hours for a full charge from a fully depleted battery, per the WatchGas Specification Sheet. That's shorter than a typical field-service workday, so monitors can be topped up between site visits.\u003c\/p\u003e\n\u003cp\u003eFor overnight full-fleet charging at a central safety station, the desktop \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-induction-cradle-charger-single-desktop-w-adapter\"\u003eSST-IND-S\u003c\/a\u003e is engineered for the same charge times — the difference between the two is form factor and power source, not charging speed.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlanning a mobile fleet-charging deployment across multiple service vehicles? Call PK Safety at 800.829.9580.\u003c\/strong\u003e A person who knows the WatchGas SST platform, Qi charging, and vehicle-wiring compatibility will pick up.\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":52919554638191,"sku":"WG01-SST-CAR-CHG","price":104.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-CAR-CHG---studio---vacuum-stand---front800x800compressed.jpg?v=1777920262"},{"product_id":"watchgas-sst1e-serviceable-h2s-gas-detector-mini-sst1e-h","title":"WatchGas SST1E Serviceable H2S Gas Detector (MINI) SST1E-H","description":"\u003cp\u003eYour team faces a critical challenge: keeping workers safe from H2S exposure while managing the rising costs of gas detection programs. The WatchGas SST1E Serviceable H2S Gas Detector solves this problem.\u003c\/p\u003e\n\u003cp\u003eMost detectors force you into expensive replacement cycles. The SST1E is different. With replaceable sensors and batteries, you extend equipment life across years—not months—cutting your cost of operation dramatically. Configure it once via NFC to match your exact safety needs, then let it work.\u003c\/p\u003e\n\u003cp\u003eIt delivers what matters most: early warnings that give workers up to 20 extra seconds to evacuate, continuous monitoring of Low, High, STEL, and TWA levels, and a display 54% larger than comparable units so hazards are impossible to miss. The gel-based electrochemical sensor uses 67% less test gas, eliminating bottlenecks in your testing workflow.\u003c\/p\u003e\n\u003cp\u003eLighter and more compact than industry standards, the SST1E fits seamlessly into your fleet operations—whether you're managing oil and gas sites, contractors, steel plants, or mining operations. Backed by a 3-year instrument warranty and 2-year sensor warranty, it's built to last.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e Oil and gas upstream, Oil and gas downstream, Contractors, Site maintenance, Turn arounds and shutdowns, Boiler rooms, Steel plants, Laboratories, Shipping, Power generation, Mining\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUtilizes a gel-based Electrochemical sensor\u003c\/li\u003e\n\u003cli\u003ePrevent H2S exposures with earlier sensor warnings – up to 20 extra seconds to evacuate\u003c\/li\u003e\n\u003cli\u003eUp to 67% less test gas consumed can save you 1000s and reduces worker testing bottlenecks\u003c\/li\u003e\n\u003cli\u003eCumulative background exposures awareness for additional insights for worker and potential leak awareness\u003c\/li\u003e\n\u003cli\u003eBetter visibility for quicker decisions – up to 54% larger display than comparable detectors\u003c\/li\u003e\n\u003cli\u003eSTEL \u0026amp; TWA Alarm Readings\u003c\/li\u003e\n\u003cli\u003eProactive safety, compliance and management with the optional RTR solution\u003c\/li\u003e\n\u003cli\u003eInstrument Warranty: 3 years\u003c\/li\u003e\n\u003cli\u003eSensor Warranty: 2 year\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUnit Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDetector\u003c\/li\u003e\n\u003cli\u003eUser Manual\u003c\/li\u003e\n\u003cli\u003eCalibration Cap\u003c\/li\u003e\n\u003cli\u003eCertificate of Calibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable style=\"width: 95.012%; height: 55.75px;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 39.1667px;\"\u003e\n\u003ctd style=\"width: 25.3045%; height: 39.1667px;\"\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 27.2215%; height: 39.1667px;\"\u003e\u003cstrong\u003eGas measuring Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 20.1286%; height: 39.1667px;\"\u003e\u003cstrong\u003eLow alarm level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 26.4547%; height: 39.1667px;\"\u003e\u003cstrong\u003eHigh alarm level\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 16.5833px;\"\u003e\n\u003ctd style=\"width: 25.3045%; height: 16.5833px;\"\u003e\u003cspan\u003eH2S\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 27.2215%; height: 16.5833px;\"\u003e\u003cspan\u003e0 - 300 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 20.1286%; height: 16.5833px;\"\u003e10 ppm\u003c\/td\u003e\n\u003ctd style=\"width: 26.4547%; height: 16.5833px;\"\u003e\u003cspan\u003e15 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eBrochure: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/SST-Range-Brochure_V4.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification Sheet: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/WatchGas-SST1-SST1E-Serviceable-DS-EN-V2.1F1F_Digital.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManual: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/MKT-SST1-SST1E-SERVICEABLE-MAN-ENG-v1.3D7F.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Start Guide: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/MKT-SST1-SST1E-QSG-V2.1D3F.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to Reset User Data and Restore Configuration: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"TN no. 27\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eSST1E-H - H2S 0-300ppm Serviceable – Real Time Display (Hydrogen Sulfide)\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53190643384687,"sku":"WG01-SST1E-H","price":220.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/sst1-e-h-front-800x800compressed.jpg?v=1783623823"},{"product_id":"watchgas-sst1e-2-year-h2s-gas-detector-mini-sst1e-h-24","title":"WatchGas SST1E 2 Year H2S Gas Detector (MINI) SST1E-H-24","description":"\u003cp\u003eYour team faces a critical choice: spend hours managing gas detector maintenance, or activate once and forget for two years. The WatchGas SST1E H2S detector eliminates the burden. One activation. Two years of continuous protection. No calibration routines. No battery swaps. No sensor replacements. No unexpected downtime that costs your operation time and money. Built for the realities of oil and gas upstream, downstream, steel plants, and shipping operations, this detector is engineered to survive harsh environments while you focus on the work that matters. Its gel-based electrochemical sensor delivers reliable H2S detection (0–300 ppm) with low and high alarm thresholds you can trust. Setup takes minutes. NFC technology puts fleet management in your pocket—download data, configure settings, and track devices from your phone. Pair it with the SST Dock for the fastest bump testing available. Hibernation mode extends instrument life even further. Cost-effective simplicity: no service calls between activations, no hidden expenses, always ready when you need it. One-year shelf life, then two years from activation. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e Oil and gas upstream, Oil and gas downstream, Contractors, Site maintenance, Turn arounds and shutdowns, Boiler rooms, Steel plants, Laboratories, Shipping, Power generation, Mining\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUtilizes a gel-based Electrochemical sensor\u003c\/li\u003e\n\u003cli\u003eEasy setup\u003c\/li\u003e\n\u003cli\u003eNFC– For effortless setup, data download, and device management.\u003c\/li\u003e\n\u003cli\u003eRuntime – The battery lasts for 24 of months visible on the display.\u003c\/li\u003e\n\u003cli\u003eIOELV (Indicative Occupational Exposure Limit Value)– Long term gas exposure data.\u003c\/li\u003e\n\u003cli\u003eConfigurable – Depending on customers’ requirements the device can be tailored.\u003c\/li\u003e\n\u003cli\u003eHibernation mode - Can be done via the WatchGas Device Link App, \u003ca title=\"WatchGas SST Kiosk SST-KIOSK\" href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\"\u003eCompliance Kiosk\u003c\/a\u003e and \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\" title=\"WatchGas Docking Station w\/Touchscreen SST-DOCK\"\u003eSST Dock\u003c\/a\u003e. This extends the lifetime of the instrument.\u003c\/li\u003e\n\u003cli\u003eCost effective– No service or other costs in between, always ready when needed.\u003c\/li\u003e\n\u003cli\u003eWarranty: One year shelf life, then two years from activation date (based on 2 min of alarm per day for 2 years).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUnit Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDetector\u003c\/li\u003e\n\u003cli\u003eUser Manual\u003c\/li\u003e\n\u003cli\u003eCalibration Cap\u003c\/li\u003e\n\u003cli\u003eCertificate of Calibration\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable width=\"100%\" style=\"width: 95.012%; height: 39.1666px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 25.289%; height: 19.5833px;\"\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 27.2903%; height: 19.5833px;\"\u003e\u003cstrong\u003eGas measuring Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 20.1948%; height: 19.5833px;\"\u003e\u003cstrong\u003eLow alarm level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 26.5626%; height: 19.5833px;\"\u003e\u003cstrong\u003eHigh alarm level\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 25.289%; height: 19.5833px;\"\u003e\u003cspan\u003eH2S\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 27.2903%; height: 19.5833px;\"\u003e\u003cspan\u003e0 - 300 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 20.1948%; height: 19.5833px;\"\u003e10 ppm\u003c\/td\u003e\n\u003ctd style=\"width: 26.5626%; height: 19.5833px;\"\u003e\u003cspan\u003e15 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e MM and DD denote the number of months and days left before the gas monitor expires. This monitor does not have a digital display of the gas concentration. Once activated, these units cannot be shut down and will continue to run for their two year life span prohibiting these items from being shipped because the alarm may be activated during transit. Additionally, these items are unable to be resold after activation. Of course, if you haven't yet activated your monitor, we will happily take it back.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eBrochure: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/SST-Range-Brochure_V4.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Brochure\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification Sheet: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/WatchGas-SST1-SST1E-MF-DS-EN-USA-V1.0F1F_Digital.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Start Guide: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"hhttps:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/MKT-SST1-SST1E-QSG-V2.1D3F.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManual: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/MKT-SST1-SST1E-2-3-YEAR-MAN-ENG-v1.4D4F.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Manual\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to Reset User Data and Restore Configuration: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"TN no. 27\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eSST1E-H-24 - 0-300ppm 2-year fixed life (hydrogen sulfide)\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53190643450223,"sku":"WG01-SST1E-H-24","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1E-H-24-800x800compressed.jpg?v=1783609570"},{"product_id":"watchgas-sst1e-3-year-h2s-gas-detector-mini-sst1e-h-36","title":"WatchGas SST1E 3 Year H2S Gas Detector (MINI) SST1E-H-36","description":"\u003cp\u003eYour team faces a critical choice: spend hours managing complex gas detection systems, or deploy a solution that works the moment you activate it. The WatchGas SST1E eliminates that burden. For three years, it continuously detects hydrogen sulfide without calibration, battery swaps, or charging. No maintenance. No surprises. Just reliable protection that your crew can trust. Switch it on. It works. That's the promise. When paired with the \u003ca title=\"WatchGas Docking Station w\/Touchscreen SST-DOCK\" href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eSST Dock\u003c\/a\u003e, bump testing becomes your fastest operation—not your bottleneck. NFC connectivity means setup takes minutes, not days. Your team spends less time managing devices and more time staying safe. Built for oil and gas, contractors, mining, power generation, and every hazardous environment where simplicity saves lives. Configurable to your exact requirements. Cost-effective with zero service expenses between activations. Three years of peace of mind. One simple device.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e Oil and gas upstream, Oil and gas downstream, Contractors, Site maintenance, Turn arounds and shutdowns, Boiler rooms, Steel plants, Laboratories, Shipping, Power generation, Mining\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUtilizes a gel-based Electrochemical sensor\u003c\/li\u003e\n\u003cli\u003eEasy setup\u003c\/li\u003e\n\u003cli\u003eNFC– For effortless setup, data download, and device management.\u003c\/li\u003e\n\u003cli\u003eRuntime – The battery lasts for 36 of months visible on the display.\u003c\/li\u003e\n\u003cli\u003eIOELV (Indicative Occupational Exposure Limit Value)– Long term gas exposure data.\u003c\/li\u003e\n\u003cli\u003eConfigurable – Depending on customers’ requirements the device can be tailored.\u003c\/li\u003e\n\u003cli\u003eHibernation mode - Can be done via the WatchGas Device Link App, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst-kiosk-sst-kiosk\" title=\"WatchGas SST Kiosk SST-KIOSK\"\u003eCompliance Kiosk\u003c\/a\u003e and \u003ca title=\"WatchGas Docking Station w\/Touchscreen SST-DOCK\" href=\"https:\/\/pksafety.com\/products\/watchgas-docking-station-w-touchscreen-sst-dock\"\u003eSST Dock\u003c\/a\u003e. This extends the lifetime of the instrument.\u003c\/li\u003e\n\u003cli\u003eCost effective– No service or other costs in between, always ready when needed.\u003c\/li\u003e\n\u003cli\u003eWarranty: One year shelf life, then three years from activation date (based on 1 min of alarm per day for 3 years).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUnit Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDetector\u003c\/li\u003e\n\u003cli\u003eUser Manual\u003c\/li\u003e\n\u003cli\u003eCalibration Cap\u003c\/li\u003e\n\u003cli\u003eCertificate of Calibration\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable style=\"width: 95.012%; height: 39.1666px;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 25.289%; height: 19.5833px;\"\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 27.2903%; height: 19.5833px;\"\u003e\u003cstrong\u003eGas measuring Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 20.1948%; height: 19.5833px;\"\u003e\u003cstrong\u003eLow alarm level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 26.5626%; height: 19.5833px;\"\u003e\u003cstrong\u003eHigh alarm level\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 25.289%; height: 19.5833px;\"\u003e\u003cspan\u003e3-year detector H2S\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 27.2903%; height: 19.5833px;\"\u003e\u003cspan\u003e0 - 300 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 20.1948%; height: 19.5833px;\"\u003e10 ppm\u003c\/td\u003e\n\u003ctd style=\"width: 26.5626%; height: 19.5833px;\"\u003e\u003cspan\u003e15 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e MM and DD denote the number of months and days left before the gas monitor expires. This monitor does not have a digital display of the gas concentration. Once activated, these units cannot be shut down and will continue to run for their two year life span prohibiting these items from being shipped because the alarm may be activated during transit. Additionally, these items are unable to be resold after activation. Of course, if you haven't yet activated your monitor, we will happily take it back.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eBrochure: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/SST-Range-Brochure_V4.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification Sheet: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/WatchGas-SST1-SST1E-MF-DS-EN-USA-V1.0F1F_Digital.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Start Guide: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"hhttps:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/MKT-SST1-SST1E-QSG-V2.1D3F.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManual: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/MKT-SST1-SST1E-2-3-YEAR-MAN-ENG-v1.4D4F.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Manual\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to Reset User Data and Restore Configuration: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/portal.watchgas.com\/repository\/api\/file_download\/tn-027-how-to-reset-user-data-and-restore-configuration-on-watchgas-sst-detectors-hl8zpiun\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"TN no. 27\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eSST1E-H-36 - 0-300ppm 3-year fixed life (hydrogen sulfide)\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53190643482991,"sku":"WG01-SST1E-H-36","price":168.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1E-H-36-800x800compressed.jpg?v=1783615302"},{"product_id":"watchgas-sst-6-way-bench-top-charger-sst-6wscc-kit","title":"WatchGas SST 6 Way Bench Top Charger SST-6WSCC-KIT","description":"\u003cp\u003eKeep your team's detection equipment charged and ready. The SST Range 6-Way Charger powers up to six devices simultaneously, eliminating downtime and the clutter of multiple chargers. Built for control rooms, workshops, and labs, this all-in-one solution keeps your SST4 and SST5 devices organized and accessible—so your crew stays equipped and your workspace stays clean.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e control rooms, workshops, laboratories, site offices, and other environments where multiple devices need to be charged and managed efficiently.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSix-Device Charging per Cradle – Charge up to 6 SST Range devices at the same time\u003c\/li\u003e\n\u003cli\u003eAll-in-One Charging Unit – One unit provides a clean and organized charging solution\u003c\/li\u003e\n\u003cli\u003eCentralized Charging Setup – Keeps devices organized in one dedicated location\u003c\/li\u003e\n\u003cli\u003eCompatible Across SST Range Devices – Supports \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\" title=\"WatchGas SST4-MICRO\"\u003eSST4 Micro\u003c\/a\u003e \u0026amp; \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\" title=\"WatchGas SST4-MINI\"\u003eSST4 Mini\u003c\/a\u003e, \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\" title=\"WatchGas SST4-PUMP\"\u003eSST4 Pump\u003c\/a\u003e, and SST5\u003c\/li\u003e\n\u003cli\u003eSimple Installation – Designed for indoor use with a simple plug-and-play setup using the supplied power adapter. Suitable for fixed placement on workbenches or designated charging areas.\u003c\/li\u003e\n\u003cli\u003eWarranty: 2-year\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Start Guide: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/MKT-SST-RANGE-6-WAY-CHARGER-QSG-V1.0.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Number:\u003c\/strong\u003e\u003cbr\u003eSST-6WSCC-KIT\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53193886105967,"sku":"WG01-SST-6WSCC-KIT","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/6-way-bench-top-charger---empty---K1E800x800compressed.jpg?v=1783964236"},{"product_id":"watchgas-sst1-external-filter-for-fine-particles","title":"WatchGas SST1 External Filter for Fine Particles","description":"\u003cp\u003eYour detector deserves protection from the elements. WatchGas SST1 External Filters shield your sensor from dust and contaminants that compromise accuracy and reliability. Simply swap them out when needed—no hassle, maximum uptime. Designed for the SST1 single gas monitors, these filters are essential in any environment where particles threaten performance. Keep one on hand. Keep your readings true. Available in packs of 10 or 100.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e\u003cbr\u003eSST-XF-10 - Pack of 10\u003cbr\u003eSST-XF-100 - Pack of 100\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"10\/Pack","offer_id":53230687191407,"sku":"WG01-SST1-XF-10","price":75.0,"currency_code":"USD","in_stock":true},{"title":"100\/Pack","offer_id":53230687388015,"sku":"WG01-SST1-XF-100","price":700.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST1-XF-10-SST1-external-filter-side800x800compressed.jpg?v=1784649292"},{"product_id":"watchgas-sst1-bump-test-starter-sst1-bs","title":"WatchGas SST1 Bump Test Starter SST1-BS","description":"\u003cp\u003eYour team faces a critical challenge: workers in the field can't perform essential safety checks without returning to the station. Downtime multiplies. Compliance becomes harder to track. Risk increases.\u003c\/p\u003e\n\u003cp\u003eThe WatchGas SST1\/E Bump Test Starter solves this. One button. Instant bump tests—right at the detector, anywhere on site. No apps. No docks. No network needed.\u003c\/p\u003e\n\u003cp\u003eYour workers get immediate visual and audible confirmation. Every action logs automatically in the detector, building an audit trail that satisfies compliance requirements without extra infrastructure. Whether you're managing onshore operations, confined spaces, utilities, or remote high-security sites, the SST1\/E keeps safety moving at the speed of work.\u003c\/p\u003e\n\u003cp\u003eRugged. Compact. Built for industrial conditions. Designed for teams that can't afford to stop.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications: \u003c\/strong\u003eonshore and offshore operations, confined spaces, utilities, heavy industry, maintenance, commissioning, and remote or high-security sites.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandalone Operation\u003c\/li\u003e\n\u003cli\u003eInstant Activation\u003c\/li\u003e\n\u003cli\u003eOne-Button Workflow\u003c\/li\u003e\n\u003cli\u003eVisual \u0026amp; Audible Feedback\u003c\/li\u003e\n\u003cli\u003eEvent Logging\u003c\/li\u003e\n\u003cli\u003ePerform critical safety actions anytime, anywhere\u003c\/li\u003e\n\u003cli\u003eReduce downtime by eliminating trips to docking stations\u003c\/li\u003e\n\u003cli\u003eEnsure consistent, repeatable, and logged safety procedures\u003c\/li\u003e\n\u003cli\u003eRugged, compact design built for industrial conditions\u003c\/li\u003e\n\u003cli\u003eIdeal for workers in high-pressure, mobile, or remote environments\u003c\/li\u003e\n\u003cli\u003eBatteries NOT included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification Sheet: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/SST1-Bump-and-SST1-Hibernation-Starter-DS-EN-USA-V.0F1F_Digital.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Specification Sheet\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Start Guide: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/02\/MKT-SST1-BUMP-STARTER-QSG-v1.1L2E.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Quick Start Guide\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e\u003cbr\u003eSST1-BS (Needs 3 AA penlights)\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53230826586479,"sku":"WG01-SST1-BS","price":168.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-Bump-starter-front-800x800compressed.jpg?v=1784658705"},{"product_id":"watchgas-sst1-hybernation-starter-sst1-hs","title":"WatchGas SST1 Hybernation Starter SST1-HS","description":"\u003cp\u003eYour safety team knows the problem: field workers must return to the station to perform critical safety checks. Every trip costs time. Compliance tracking becomes fragmented. Risk exposure grows.\u003c\/p\u003e\n\u003cp\u003eThe WatchGas SST1\/E Hibernation Starter eliminates that friction. A single button triggers instant hibernation directly on the detector—anywhere, anytime. No applications. No docking stations. No connectivity required.\u003c\/p\u003e\n\u003cp\u003eWorkers receive immediate visual and audible confirmation. The detector automatically records every hibernation event in its internal memory, building a complete compliance record without requiring external systems or additional software. Whether your operations span onshore and offshore sites, confined spaces, utilities, or high-security remote locations, the SST1\/E keeps safety moving at operational speed.\u003c\/p\u003e\n\u003cp\u003eBuilt tough. Engineered compact. Designed for industrial environments where stopping isn't an option.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications: \u003c\/strong\u003eonshore and offshore operations, confined spaces, utilities, heavy industry, maintenance, commissioning, and remote or high-security sites.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandalone Operation\u003c\/li\u003e\n\u003cli\u003eInstant Activation\u003c\/li\u003e\n\u003cli\u003eOne-Button Workflow\u003c\/li\u003e\n\u003cli\u003eVisual \u0026amp; Audible Feedback\u003c\/li\u003e\n\u003cli\u003eEvent Logging\u003c\/li\u003e\n\u003cli\u003ePerform critical safety actions anytime, anywhere\u003c\/li\u003e\n\u003cli\u003eReduce downtime by eliminating trips to docking stations\u003c\/li\u003e\n\u003cli\u003eEnsure consistent, repeatable, and logged safety procedures\u003c\/li\u003e\n\u003cli\u003eRugged, compact design built for industrial conditions\u003c\/li\u003e\n\u003cli\u003eIdeal for workers in high-pressure, mobile, or remote environments\u003c\/li\u003e\n\u003cli\u003eBatteries NOT included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification Sheet: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/06\/SST1-Bump-and-SST1-Hibernation-Starter-DS-EN-USA-V.0F1F_Digital.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Specification Sheet\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuick Start Guide: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/02\/MKT-SST1-HIBERNATION-STARTER-QSG-v1.0L1E.pdf\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\" alt=\"Quick Start Guide\" width=\"63\" height=\"65\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e\u003cbr\u003eSST1-HS (Needs 3 AA penlights)\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53230826619247,"sku":"WG01-SST1-HS","price":168.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-Hibernation-starter-front-800x800compressed.jpg?v=1784661939"},{"product_id":"watchgas-sst4-micro-external-filter-sst4-micro-xfil-10-10-pk","title":"WatchGas SST4-MICRO External Filter SST4-MICRO-XFIL-10 (10\/pk)","description":"\u003cp\u003eProtect your gas detection accuracy with the WatchGas SST4-MICRO External Filter. This pack of 10 replacement filters removes fine particulates that can compromise sensor performance, keeping your \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-micro-diffusion-4-gas-detector\" title=\"WatchGas SST4-MICRO: 4-Gas Confined-Space Monitor | PK Safety\"\u003eSST4-MICRO Diffusion 4-Gas Detector\u003c\/a\u003e operating at peak reliability. Essential maintenance for continuous, dependable gas monitoring in demanding environments.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e\u003cbr\u003eSST4-MICRO-XFIL-10 - Pack of 10\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53231235072367,"sku":"WG01-SST4-MICRO-XFIL-10","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-MICRO-XFIL-10-External-filter-SST4-Micro-800x800compressed.jpg?v=1784818469"},{"product_id":"watchgas-sst4-mini-external-filter-sst4-mini-xfil-10-10-pk","title":"WatchGas SST4-MINI External Filter SST4-MINI-XFIL-10 (10\/pk)","description":"\u003cp\u003eProtect your gas detection accuracy with the WatchGas SST4-MINI External Filter. These replaceable filters block fine dust and particulates before they reach your sensor, extending equipment life and ensuring reliable readings. Each pack contains 10 filters—the essential maintenance component for your \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-mini-diffusion-4-gas-detector\" title=\"WatchGas SST4-MINI: Compact 4-Gas Monitor | PK Safety\"\u003eWatchGas SST4-MINI Diffusion 4-Gas Detector\u003c\/a\u003e. Keep your detector performing at peak sensitivity with fresh filters on hand.\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e\u003cbr\u003eSST4-MINI-XFIL-10 - Pack of 10\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53231235105135,"sku":"WG01-SST4-MINI-XFIL-10","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST-MINI-XFIL-10-External-filter-SST4-Mini-800x800compressed.jpg?v=1784817986"},{"product_id":"watchgas-sst4-pump-sampling-charging-kit-sst4-pump-acc","title":"WatchGas SST4-PUMP Sampling \u0026 Charging Kit SST4-PUMP-ACC","description":"\u003cp\u003eProtect your \u003ca href=\"https:\/\/pksafety.com\/products\/watchgas-sst4-pump-4-gas-detector\" title=\"WatchGas SST4-PUMP: Sample-Draw 4-Gas Monitor | PK Safety\"\u003eSST4-Pump\u003c\/a\u003e investment with this comprehensive accessories kit. Includes global power adapters (US, EU, GB, AU), multiple filter options, 3 m \/ 10 ft Last-O-More tube with luer connector, and screwdriver. Stay prepared for any sampling or charging task in demanding environments while maintaining peak pump performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Wall adapter (US, EU, GB \u0026amp; AU) \u003c\/li\u003e\n\u003cli\u003e(1) Screwdriver in case \u003c\/li\u003e\n\u003cli\u003e(3) External watertrap filter \u003c\/li\u003e\n\u003cli\u003e(1) Sintered filter with Hose barb connection \u003c\/li\u003e\n\u003cli\u003e(3) Sintered filter\u003c\/li\u003e\n\u003cli\u003e(5) Internal filter \u003c\/li\u003e\n\u003cli\u003e(1) Last-O-More tube 3x5 3 m \/ 10 ft \u003c\/li\u003e\n\u003cli\u003e(1) Luer (attached to Last-O-More)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e\u003cbr\u003eSST4-PUMP-ACC\u003c\/p\u003e\n\u003cdiv class=\"specification\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53236928840047,"sku":"WG01-SST4-PUMP-ACC","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST4-PUMP-ACC800x800compressed.jpg?v=1784833159"},{"product_id":"watchgas-sst-reducer-set-sst-7sol-reducer-set","title":"WatchGas SST Reducer Set SST-7SOL-Reducer-Set","description":"\u003cp\u003eYour customers face a problem: connecting different tubing sizes without losing pressure or consistency. The WatchGas SST Reducer Set solves this. It's the bridge between your 3×5 mm and 5×8 mm lines—no leaks, no guesswork, just reliable transitions every time. Whether you're sampling air quality or calibrating equipment in the field, this set keeps your workflow smooth and your data dependable. One reducer, one solution, zero frustration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Last-O-More 5x8mm 10cm \/ 4 in\u003c\/li\u003e\n\u003cli\u003e(1) Reducer\u003c\/li\u003e\n\u003cli\u003e(1) Last-O-More 3x5mm 1m \/ 3 ft\u003c\/li\u003e\n\u003cli\u003e(1) Male Luer 3x5mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"specification\"\u003e\n\u003cp\u003e\u003cstrong\u003eSST Accessories Brochure:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/watchgasusa.com\/app\/uploads\/2026\/04\/SST-Range-Solutions-and-Accessories-Brochure-V2.0-D4F-LJU.pdf\" target=\"_blank\"\u003e\u003cimg border=\"0\" height=\"65\" width=\"63\" alt=\"Brochure\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/pdf-icon_ac4da377-e8e0-4a9c-9dcc-746269055096.png\"\u003e\u003c\/a\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e \u003cbr\u003eSST4-7SOL-REDUCER-SET\u003c\/p\u003e","brand":"WatchGas","offers":[{"title":"Default Title","offer_id":53236965015919,"sku":"WG01-SST-7SOL-Reducer-Set","price":21.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/5469\/6254\/files\/SST4-7SOL-Reducer-Set-Reducer-Set-_5x8-Last-o-More-Reducer-3x5-Last-o-More-Male-luer_-800x800compressed.jpg?v=1784834609"}],"url":"https:\/\/pksafety.com\/collections\/watchgas.oembed?page=4","provider":"PK Safety Supply","version":"1.0","type":"link"}