WatchGas SST1 2 Year H2S Gas Detector SST1-H-24
Description
Not 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.
The 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.
Three ways to run H2S monitoring — pick the one that fits your job.
The SST1 line covers all three tiers:
-
Full-instrument, serviceable: the
WatchGas SST1-H serviceable H2S monitor ($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.
-
Alert-only, 3-year lifespan: the
WatchGas SST1-H-36 3-Year Alert-Only ($210) — no display, factory-set alarms, non-serviceable, three-year operational life.
-
Alert-only, 2-year lifespan (this SKU): $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.
Factory-set alarm thresholds, anchored to U.S. regulatory exposure limits for hydrogen sulfide (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.
Who buys the SST1-H-24 for H2S monitoring:
- Contractors and subcontractors on short-duration oil & gas turnaround work — 2-year lifespan matches multi-month contract cycles better than 3-year for single-project work
- Small crews at wastewater treatment plants and sewer operations without full safety-program overhead
- Municipal utility emergency response teams needing low-cost grab-and-go H2S inventory
- Mining and mineral processing crews entering H2S-prone confined space areas on temporary assignment
- Pulp and paper mill maintenance teams on short-project deployments
- Training programs using disposable monitors for teaching — shorter lifespan means training-gear inventory turns more frequently at lower unit cost
- Consultants and auditors on temporary deployments at client sites where H2S is a known hazard
Sensor and alarm specifications:
Sensor
Gas measuring range
Low alarm (factory-set)
High alarm (factory-set)
H2S (2-year fixed life)
0 – 500 ppm
10 ppm
(NIOSH REL Ceiling)
15 ppm
(between NIOSH 10 / OSHA 20)
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. 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
800.829.9580 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.
Important lifecycle notes:
-
Warranty: 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.
-
Once activated, the monitor cannot be shut down. 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.
-
Not resellable after activation. Buy for a specific worker or crew; the monitor stays with them.
-
The display shows MM and DD — months and days remaining before the monitor expires — not the current gas concentration.
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Manual
Part Number: WG01-SST1-H-24 — SST1-H-24 0–500 ppm 2-year fixed life (hydrogen sulfide)
Frequently Asked Questions
How does the SST1-H-24 alert-only monitor differ from the full-instrument SST1-H and the 3-year SST1-H-36?
The SST1 platform offers three tiers for H2S monitoring, and this is the entry-price alert-only tier.
Display and configuration: 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
WatchGas SST1-H serviceable H2S monitor shows continuous ppm readouts and offers configurable low/high/TWA/STEL alarms.
Sensor lifecycle and price: 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
SST1-H-36 3-Year Alert-Only 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.
Choose 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.
What are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?
The 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):
OSHA's ceiling 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.
NIOSH's REL is stricter at 10 ppm as a 10-minute ceiling (per the CDC/NIOSH Pocket Guide).
The SST1-H-24's
Low 10 ppm alarm matches the NIOSH REL Ceiling exactly. The
High 15 ppm 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.
If 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
WatchGas SST1-H serviceable H2S monitor is the right choice; its low/high/TWA/STEL alarms are all configurable.
What does "2-year" actually mean? When does the clock start?
The 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.
The 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.
Once activated, can the monitor be shut down, returned, or shipped?
No. 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:
Not shippable after activation: because the alarm may sound during transit, activated monitors cannot be shipped by common carriers. Ship unactivated units, activate on-site.
Not returnable after activation: activated units are not eligible for return. Unactivated units can be returned normally within PK Safety's standard return window.
Not resellable after activation: assign each activated monitor to a specific worker or crew; it stays with them for its lifespan.
Does the SST1-H-24 work with the WatchGas SST-DOCK and SST-KIOSK?
Partially. The SST1-H-24 can be bump-tested using the
WatchGas SST-DOCK — 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).
The
WatchGas SST-KIOSK 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.
How does PK Safety support the SST1-H-24 after purchase?
PK 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.
Call
800.829.9580 to talk through your H2S monitoring workflow with someone who understands all three tiers of the SST1 line — not a call-center script.
Not sure which SST1 H2S tier fits your workflow? Call PK Safety at 800.829.9580. A person who knows the serviceable / 3-year alert-only / 2-year alert-only choice will pick up.
Read more
Description
Not 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.
The 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.
Three ways to run H2S monitoring — pick the one that fits your job.
The SST1 line covers all three tiers:
- Full-instrument, serviceable: the WatchGas SST1-H serviceable H2S monitor ($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.
- Alert-only, 3-year lifespan: the WatchGas SST1-H-36 3-Year Alert-Only ($210) — no display, factory-set alarms, non-serviceable, three-year operational life.
- Alert-only, 2-year lifespan (this SKU): $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.
Factory-set alarm thresholds, anchored to U.S. regulatory exposure limits for hydrogen sulfide (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.
Who buys the SST1-H-24 for H2S monitoring:
- Contractors and subcontractors on short-duration oil & gas turnaround work — 2-year lifespan matches multi-month contract cycles better than 3-year for single-project work
- Small crews at wastewater treatment plants and sewer operations without full safety-program overhead
- Municipal utility emergency response teams needing low-cost grab-and-go H2S inventory
- Mining and mineral processing crews entering H2S-prone confined space areas on temporary assignment
- Pulp and paper mill maintenance teams on short-project deployments
- Training programs using disposable monitors for teaching — shorter lifespan means training-gear inventory turns more frequently at lower unit cost
- Consultants and auditors on temporary deployments at client sites where H2S is a known hazard
Sensor and alarm specifications:
| Sensor | Gas measuring range | Low alarm (factory-set) | High alarm (factory-set) |
| H2S (2-year fixed life) | 0 – 500 ppm | 10 ppm (NIOSH REL Ceiling) | 15 ppm (between NIOSH 10 / OSHA 20) |
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. 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 800.829.9580 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.
Important lifecycle notes:
- Warranty: 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.
- Once activated, the monitor cannot be shut down. 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.
- Not resellable after activation. Buy for a specific worker or crew; the monitor stays with them.
- The display shows MM and DD — months and days remaining before the monitor expires — not the current gas concentration.
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Manual
Part Number: WG01-SST1-H-24 — SST1-H-24 0–500 ppm 2-year fixed life (hydrogen sulfide)
Frequently Asked Questions
How does the SST1-H-24 alert-only monitor differ from the full-instrument SST1-H and the 3-year SST1-H-36?
The SST1 platform offers three tiers for H2S monitoring, and this is the entry-price alert-only tier.
Display and configuration: 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 WatchGas SST1-H serviceable H2S monitor shows continuous ppm readouts and offers configurable low/high/TWA/STEL alarms.
Sensor lifecycle and price: 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 SST1-H-36 3-Year Alert-Only 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.
Choose 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.
What are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?
The 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):
OSHA's ceiling 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.
NIOSH's REL is stricter at 10 ppm as a 10-minute ceiling (per the CDC/NIOSH Pocket Guide).
The SST1-H-24's Low 10 ppm alarm matches the NIOSH REL Ceiling exactly. The High 15 ppm 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.
If 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 WatchGas SST1-H serviceable H2S monitor is the right choice; its low/high/TWA/STEL alarms are all configurable.
What does "2-year" actually mean? When does the clock start?
The 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.
The 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.
Once activated, can the monitor be shut down, returned, or shipped?
No. 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:
Not shippable after activation: because the alarm may sound during transit, activated monitors cannot be shipped by common carriers. Ship unactivated units, activate on-site.
Not returnable after activation: activated units are not eligible for return. Unactivated units can be returned normally within PK Safety's standard return window.
Not resellable after activation: assign each activated monitor to a specific worker or crew; it stays with them for its lifespan.
Does the SST1-H-24 work with the WatchGas SST-DOCK and SST-KIOSK?
Partially. The SST1-H-24 can be bump-tested using the WatchGas SST-DOCK — 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).
The WatchGas SST-KIOSK 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.
How does PK Safety support the SST1-H-24 after purchase?
PK 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.
Call 800.829.9580 to talk through your H2S monitoring workflow with someone who understands all three tiers of the SST1 line — not a call-center script.
Not sure which SST1 H2S tier fits your workflow? Call PK Safety at 800.829.9580. A person who knows the serviceable / 3-year alert-only / 2-year alert-only choice will pick up.
Not 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.
The 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.
Three ways to run H2S monitoring — pick the one that fits your job.
The SST1 line covers all three tiers:
- Full-instrument, serviceable: the WatchGas SST1-H serviceable H2S monitor ($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.
- Alert-only, 3-year lifespan: the WatchGas SST1-H-36 3-Year Alert-Only ($210) — no display, factory-set alarms, non-serviceable, three-year operational life.
- Alert-only, 2-year lifespan (this SKU): $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.
Factory-set alarm thresholds, anchored to U.S. regulatory exposure limits for hydrogen sulfide (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.
Who buys the SST1-H-24 for H2S monitoring:
- Contractors and subcontractors on short-duration oil & gas turnaround work — 2-year lifespan matches multi-month contract cycles better than 3-year for single-project work
- Small crews at wastewater treatment plants and sewer operations without full safety-program overhead
- Municipal utility emergency response teams needing low-cost grab-and-go H2S inventory
- Mining and mineral processing crews entering H2S-prone confined space areas on temporary assignment
- Pulp and paper mill maintenance teams on short-project deployments
- Training programs using disposable monitors for teaching — shorter lifespan means training-gear inventory turns more frequently at lower unit cost
- Consultants and auditors on temporary deployments at client sites where H2S is a known hazard
Sensor and alarm specifications:
| Sensor | Gas measuring range | Low alarm (factory-set) | High alarm (factory-set) |
| H2S (2-year fixed life) | 0 – 500 ppm | 10 ppm (NIOSH REL Ceiling) | 15 ppm (between NIOSH 10 / OSHA 20) |
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. 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 800.829.9580 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.
Important lifecycle notes:
- Warranty: 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.
- Once activated, the monitor cannot be shut down. 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.
- Not resellable after activation. Buy for a specific worker or crew; the monitor stays with them.
- The display shows MM and DD — months and days remaining before the monitor expires — not the current gas concentration.
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Manual
Part Number: WG01-SST1-H-24 — SST1-H-24 0–500 ppm 2-year fixed life (hydrogen sulfide)
Frequently Asked Questions
How does the SST1-H-24 alert-only monitor differ from the full-instrument SST1-H and the 3-year SST1-H-36?
The SST1 platform offers three tiers for H2S monitoring, and this is the entry-price alert-only tier.
Display and configuration: 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 WatchGas SST1-H serviceable H2S monitor shows continuous ppm readouts and offers configurable low/high/TWA/STEL alarms.
Sensor lifecycle and price: 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 SST1-H-36 3-Year Alert-Only 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.
Choose 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.
What are the factory-set alarm thresholds, and how do they align with OSHA and NIOSH?
The 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):
OSHA's ceiling 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.
NIOSH's REL is stricter at 10 ppm as a 10-minute ceiling (per the CDC/NIOSH Pocket Guide).
The SST1-H-24's Low 10 ppm alarm matches the NIOSH REL Ceiling exactly. The High 15 ppm 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.
If 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 WatchGas SST1-H serviceable H2S monitor is the right choice; its low/high/TWA/STEL alarms are all configurable.
What does "2-year" actually mean? When does the clock start?
The 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.
The 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.
Once activated, can the monitor be shut down, returned, or shipped?
No. 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:
Not shippable after activation: because the alarm may sound during transit, activated monitors cannot be shipped by common carriers. Ship unactivated units, activate on-site.
Not returnable after activation: activated units are not eligible for return. Unactivated units can be returned normally within PK Safety's standard return window.
Not resellable after activation: assign each activated monitor to a specific worker or crew; it stays with them for its lifespan.
Does the SST1-H-24 work with the WatchGas SST-DOCK and SST-KIOSK?
Partially. The SST1-H-24 can be bump-tested using the WatchGas SST-DOCK — 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).
The WatchGas SST-KIOSK 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.
How does PK Safety support the SST1-H-24 after purchase?
PK 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.
Call 800.829.9580 to talk through your H2S monitoring workflow with someone who understands all three tiers of the SST1 line — not a call-center script.
Not sure which SST1 H2S tier fits your workflow? Call PK Safety at 800.829.9580. A person who knows the serviceable / 3-year alert-only / 2-year alert-only choice will pick up.
Specifications
Specifications
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MPN
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