WatchGas SST4-PUMP 4-Gas Detector
Description
Permit-required confined-space entry starts with one absolute rule: test the atmosphere before anyone goes in.
The 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.
The WatchGas SST4-PUMP draws a sample from the space to the monitor, not the worker to the sample.
Attach 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.
Why entry attendants and confined-space safety managers standardize on the SST4-PUMP:
- Sample-draw architecture with bottom-mounted draw line — clean geometry for tank, vault, sewer, and silo pre-entry sampling
- Sample tubing up to 20 feet — reach deep into a space without opening more than the entry point
- Choice 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
- Included water trap filter — protects sensors from moisture in sewers, sewage networks, wet-well applications, and boiler-room sample lines
- Included internal particulate filters (5 replacements) plus sinter filter — catches dust and debris before it reaches the sensors
- Same 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
- 2-year warranty on the SST4 platform
- SST-DOCK compatible for automated bump test, calibration, and datalogged compliance workflow
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 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
800.829.9580 to talk through the SST4-PUMP setup with someone who actually understands permit-required confined-space entry and the WatchGas SST platform.
This is right for you if:
- You are the entry attendant or safety manager responsible for the pre-entry atmospheric test under 29 CFR 1910.146(d)
- You need to sample tanks, storage vessels, sewers, silos, ship holds, or utility vaults from outside before workers enter
- You do entries into inerted atmospheres (nitrogen, CO2, argon blankets) — the NDIR variant is what you want; LPC won't work without oxygen present
- You'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
- You need a monitor with a water trap and particulate filtration for wet or dusty entries (wastewater, sewers, silos)
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Manual
Part Numbers:
WG01-SST4-PUMP-X4OMH-Y — LEL LPC / O2 / CO / H2S, Low Power Catalytic sensor
WG01-SST4-PUMP-X3OMH-Y — LEL NDIR / O2 / CO / H2S, Non-Dispersive Infrared sensor (for inerted atmospheres)
Frequently Asked Questions
When should I use a pump-draw monitor (SST4-PUMP) versus a diffusion monitor (SST4-MICRO)?
Use 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.
Use 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.
What's the difference between the LPC and NDIR LEL sensor variants?
LPC (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.
NDIR (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.
How far can I sample with the SST4-PUMP's tubing?
The 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.
For 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.
Does the SST4-PUMP work with the WatchGas SST-DOCK docking station?
Yes. The SST4-PUMP is fully compatible with the
WatchGas SST-DOCK Touchscreen docking station for bump testing, calibration, and datalogging. The SST-DOCK automates the compliance workflow with timestamped logs suitable for OSHA 29 CFR 1910.146 recordkeeping.
The 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.
How often should I bump test and calibrate the SST4-PUMP?
Bump 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.
Sample-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.
How does PK Safety support the SST4-PUMP after purchase?
PK 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
800.829.9580 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.
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 whether the SST4-PUMP or SST4-MICRO is right for your entry program? Call PK Safety at 800.829.9580. A person who knows permit-required confined-space entry and the WatchGas SST platform will pick up.
Read more
Description
Permit-required confined-space entry starts with one absolute rule: test the atmosphere before anyone goes in.
The 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.
The WatchGas SST4-PUMP draws a sample from the space to the monitor, not the worker to the sample.
Attach 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.
Why entry attendants and confined-space safety managers standardize on the SST4-PUMP:
- Sample-draw architecture with bottom-mounted draw line — clean geometry for tank, vault, sewer, and silo pre-entry sampling
- Sample tubing up to 20 feet — reach deep into a space without opening more than the entry point
- Choice 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
- Included water trap filter — protects sensors from moisture in sewers, sewage networks, wet-well applications, and boiler-room sample lines
- Included internal particulate filters (5 replacements) plus sinter filter — catches dust and debris before it reaches the sensors
- Same 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
- 2-year warranty on the SST4 platform
- SST-DOCK compatible for automated bump test, calibration, and datalogged compliance workflow
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 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 800.829.9580 to talk through the SST4-PUMP setup with someone who actually understands permit-required confined-space entry and the WatchGas SST platform.
This is right for you if:
- You are the entry attendant or safety manager responsible for the pre-entry atmospheric test under 29 CFR 1910.146(d)
- You need to sample tanks, storage vessels, sewers, silos, ship holds, or utility vaults from outside before workers enter
- You do entries into inerted atmospheres (nitrogen, CO2, argon blankets) — the NDIR variant is what you want; LPC won't work without oxygen present
- You'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
- You need a monitor with a water trap and particulate filtration for wet or dusty entries (wastewater, sewers, silos)
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Manual
Part Numbers:
WG01-SST4-PUMP-X4OMH-Y — LEL LPC / O2 / CO / H2S, Low Power Catalytic sensor
WG01-SST4-PUMP-X3OMH-Y — LEL NDIR / O2 / CO / H2S, Non-Dispersive Infrared sensor (for inerted atmospheres)
Frequently Asked Questions
When should I use a pump-draw monitor (SST4-PUMP) versus a diffusion monitor (SST4-MICRO)?
Use 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.
Use 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.
What's the difference between the LPC and NDIR LEL sensor variants?
LPC (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.
NDIR (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.
How far can I sample with the SST4-PUMP's tubing?
The 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.
For 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.
Does the SST4-PUMP work with the WatchGas SST-DOCK docking station?
Yes. The SST4-PUMP is fully compatible with the WatchGas SST-DOCK Touchscreen docking station for bump testing, calibration, and datalogging. The SST-DOCK automates the compliance workflow with timestamped logs suitable for OSHA 29 CFR 1910.146 recordkeeping.
The 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.
How often should I bump test and calibrate the SST4-PUMP?
Bump 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.
Sample-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.
How does PK Safety support the SST4-PUMP after purchase?
PK 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 800.829.9580 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.
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 whether the SST4-PUMP or SST4-MICRO is right for your entry program? Call PK Safety at 800.829.9580. A person who knows permit-required confined-space entry and the WatchGas SST platform will pick up.
Permit-required confined-space entry starts with one absolute rule: test the atmosphere before anyone goes in.
The 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.
The WatchGas SST4-PUMP draws a sample from the space to the monitor, not the worker to the sample.
Attach 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.
Why entry attendants and confined-space safety managers standardize on the SST4-PUMP:
- Sample-draw architecture with bottom-mounted draw line — clean geometry for tank, vault, sewer, and silo pre-entry sampling
- Sample tubing up to 20 feet — reach deep into a space without opening more than the entry point
- Choice 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
- Included water trap filter — protects sensors from moisture in sewers, sewage networks, wet-well applications, and boiler-room sample lines
- Included internal particulate filters (5 replacements) plus sinter filter — catches dust and debris before it reaches the sensors
- Same 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
- 2-year warranty on the SST4 platform
- SST-DOCK compatible for automated bump test, calibration, and datalogged compliance workflow
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 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 800.829.9580 to talk through the SST4-PUMP setup with someone who actually understands permit-required confined-space entry and the WatchGas SST platform.
This is right for you if:
- You are the entry attendant or safety manager responsible for the pre-entry atmospheric test under 29 CFR 1910.146(d)
- You need to sample tanks, storage vessels, sewers, silos, ship holds, or utility vaults from outside before workers enter
- You do entries into inerted atmospheres (nitrogen, CO2, argon blankets) — the NDIR variant is what you want; LPC won't work without oxygen present
- You'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
- You need a monitor with a water trap and particulate filtration for wet or dusty entries (wastewater, sewers, silos)
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Manual
Part Numbers:
WG01-SST4-PUMP-X4OMH-Y — LEL LPC / O2 / CO / H2S, Low Power Catalytic sensor
WG01-SST4-PUMP-X3OMH-Y — LEL NDIR / O2 / CO / H2S, Non-Dispersive Infrared sensor (for inerted atmospheres)
Frequently Asked Questions
When should I use a pump-draw monitor (SST4-PUMP) versus a diffusion monitor (SST4-MICRO)?
Use 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.
Use 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.
What's the difference between the LPC and NDIR LEL sensor variants?
LPC (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.
NDIR (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.
How far can I sample with the SST4-PUMP's tubing?
The 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.
For 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.
Does the SST4-PUMP work with the WatchGas SST-DOCK docking station?
Yes. The SST4-PUMP is fully compatible with the WatchGas SST-DOCK Touchscreen docking station for bump testing, calibration, and datalogging. The SST-DOCK automates the compliance workflow with timestamped logs suitable for OSHA 29 CFR 1910.146 recordkeeping.
The 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.
How often should I bump test and calibrate the SST4-PUMP?
Bump 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.
Sample-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.
How does PK Safety support the SST4-PUMP after purchase?
PK 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 800.829.9580 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.
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 whether the SST4-PUMP or SST4-MICRO is right for your entry program? Call PK Safety at 800.829.9580. A person who knows permit-required confined-space entry and the WatchGas SST platform will pick up.
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