WatchGas SST1 Serviceable CO ppm Gas Detector SST1-M
Description
Carbon 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.
Workers 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.
The 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.
Configurable 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.
Why the freshness question matters on a CO monitor:
CO 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.
The 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.
Why safety managers standardize on the SST1-M:
- Continuous CO monitoring across 0–2000 ppm with configurable low, high, TWA, and STEL alarms
- Serviceable sensor cell — replace at end-of-life instead of scrapping the whole monitor
- Serviceable battery — 3-year replaceable
- 3-year instrument warranty; 2-year sensor warranty
- Solid polymer sensor technology — more stable than legacy CO sensor designs
- NFC configuration and WatchGas App for phone-based setup
- Vibration, audible, and visual alarms — you feel it in a running-machine environment
- Compatible with the
WatchGas SST-DOCK for automated bump test, calibration, and datalogged compliance workflow
- Datalogging for compliance audits — OSHA 29 CFR 1910.146 permit-required confined space, and internal exposure programs
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. 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
800.829.9580 to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform.
This is right for you if:
- You run warehouse or distribution operations with propane forklifts (indoor combustion is the classic CO exposure environment — well documented in OSHA compliance directives)
- You maintain boiler rooms, mechanical rooms, or utility rooms where natural gas or propane combustion equipment operates
- You run a service garage, small engine shop, or auto body operation where vehicle exhaust accumulates indoors
- You use indoor generators, air compressors, or other combustion-driven equipment in enclosed spaces
- You do confined-space entry work in spaces adjacent to combustion sources (mechanical rooms, boiler penetrations, exhaust chases)
- You need audit-ready CO exposure logs for OSHA recordkeeping under 29 CFR 1910.146
Technical documents:
Brochure
Specification Sheet
Manual
Firmware Download
Part Number: WG01-SST1-M — CO 0–2000 ppm Serviceable, Real Time Display (Carbon Monoxide)
Frequently Asked Questions
What is the OSHA exposure limit for carbon monoxide?
OSHA'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).
The 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).
Why is carbon monoxide especially dangerous compared to other toxic gases?
CO 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.
The 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.
What does "serviceable" mean on the SST1-M?
Traditional 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.
The 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.
How often should I bump test and calibrate the SST1-M?
Bump 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.
Operations 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
WatchGas SST-DOCK automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect.
Does the SST1-M work with the WatchGas SST-DOCK docking station?
Yes. The SST1-M is fully compatible with the
WatchGas SST-DOCK Touchscreen docking station 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.
The 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.
How does PK Safety support the SST1-M after purchase?
PK 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
800.829.9580 to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform — not a call-center script.
PK 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.
Not sure the SST1-M is the right monitor for your CO exposure program? Call PK Safety at 800.829.9580. A person who knows indoor-combustion work and the WatchGas SST platform will pick up.
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Description
Carbon 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.
Workers 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.
The 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.
Configurable 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.
Why the freshness question matters on a CO monitor:
CO 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.
The 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.
Why safety managers standardize on the SST1-M:
- Continuous CO monitoring across 0–2000 ppm with configurable low, high, TWA, and STEL alarms
- Serviceable sensor cell — replace at end-of-life instead of scrapping the whole monitor
- Serviceable battery — 3-year replaceable
- 3-year instrument warranty; 2-year sensor warranty
- Solid polymer sensor technology — more stable than legacy CO sensor designs
- NFC configuration and WatchGas App for phone-based setup
- Vibration, audible, and visual alarms — you feel it in a running-machine environment
- Compatible with the WatchGas SST-DOCK for automated bump test, calibration, and datalogged compliance workflow
- Datalogging for compliance audits — OSHA 29 CFR 1910.146 permit-required confined space, and internal exposure programs
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. 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 800.829.9580 to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform.
This is right for you if:
- You run warehouse or distribution operations with propane forklifts (indoor combustion is the classic CO exposure environment — well documented in OSHA compliance directives)
- You maintain boiler rooms, mechanical rooms, or utility rooms where natural gas or propane combustion equipment operates
- You run a service garage, small engine shop, or auto body operation where vehicle exhaust accumulates indoors
- You use indoor generators, air compressors, or other combustion-driven equipment in enclosed spaces
- You do confined-space entry work in spaces adjacent to combustion sources (mechanical rooms, boiler penetrations, exhaust chases)
- You need audit-ready CO exposure logs for OSHA recordkeeping under 29 CFR 1910.146
Technical documents:
Brochure
Specification Sheet
Manual
Firmware Download
Part Number: WG01-SST1-M — CO 0–2000 ppm Serviceable, Real Time Display (Carbon Monoxide)
Frequently Asked Questions
What is the OSHA exposure limit for carbon monoxide?
OSHA'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).
The 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).
Why is carbon monoxide especially dangerous compared to other toxic gases?
CO 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.
The 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.
What does "serviceable" mean on the SST1-M?
Traditional 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.
The 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.
How often should I bump test and calibrate the SST1-M?
Bump 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.
Operations 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 WatchGas SST-DOCK automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect.
Does the SST1-M work with the WatchGas SST-DOCK docking station?
Yes. The SST1-M is fully compatible with the WatchGas SST-DOCK Touchscreen docking station 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.
The 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.
How does PK Safety support the SST1-M after purchase?
PK 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 800.829.9580 to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform — not a call-center script.
PK 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.
Not sure the SST1-M is the right monitor for your CO exposure program? Call PK Safety at 800.829.9580. A person who knows indoor-combustion work and the WatchGas SST platform will pick up.
Carbon 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.
Workers 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.
The 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.
Configurable 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.
Why the freshness question matters on a CO monitor:
CO 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.
The 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.
Why safety managers standardize on the SST1-M:
- Continuous CO monitoring across 0–2000 ppm with configurable low, high, TWA, and STEL alarms
- Serviceable sensor cell — replace at end-of-life instead of scrapping the whole monitor
- Serviceable battery — 3-year replaceable
- 3-year instrument warranty; 2-year sensor warranty
- Solid polymer sensor technology — more stable than legacy CO sensor designs
- NFC configuration and WatchGas App for phone-based setup
- Vibration, audible, and visual alarms — you feel it in a running-machine environment
- Compatible with the WatchGas SST-DOCK for automated bump test, calibration, and datalogged compliance workflow
- Datalogging for compliance audits — OSHA 29 CFR 1910.146 permit-required confined space, and internal exposure programs
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. 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 800.829.9580 to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform.
This is right for you if:
- You run warehouse or distribution operations with propane forklifts (indoor combustion is the classic CO exposure environment — well documented in OSHA compliance directives)
- You maintain boiler rooms, mechanical rooms, or utility rooms where natural gas or propane combustion equipment operates
- You run a service garage, small engine shop, or auto body operation where vehicle exhaust accumulates indoors
- You use indoor generators, air compressors, or other combustion-driven equipment in enclosed spaces
- You do confined-space entry work in spaces adjacent to combustion sources (mechanical rooms, boiler penetrations, exhaust chases)
- You need audit-ready CO exposure logs for OSHA recordkeeping under 29 CFR 1910.146
Technical documents:
Brochure
Specification Sheet
Manual
Firmware Download
Part Number: WG01-SST1-M — CO 0–2000 ppm Serviceable, Real Time Display (Carbon Monoxide)
Frequently Asked Questions
What is the OSHA exposure limit for carbon monoxide?
OSHA'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).
The 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).
Why is carbon monoxide especially dangerous compared to other toxic gases?
CO 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.
The 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.
What does "serviceable" mean on the SST1-M?
Traditional 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.
The 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.
How often should I bump test and calibrate the SST1-M?
Bump 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.
Operations 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 WatchGas SST-DOCK automates both bump test and calibration in about 60 seconds per unit and produces the compliance logs OSHA auditors expect.
Does the SST1-M work with the WatchGas SST-DOCK docking station?
Yes. The SST1-M is fully compatible with the WatchGas SST-DOCK Touchscreen docking station 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.
The 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.
How does PK Safety support the SST1-M after purchase?
PK 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 800.829.9580 to talk through your CO monitoring setup with someone who understands indoor-combustion work and the WatchGas SST platform — not a call-center script.
PK 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.
Not sure the SST1-M is the right monitor for your CO exposure program? Call PK Safety at 800.829.9580. A person who knows indoor-combustion work and the WatchGas SST platform will pick up.
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