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Portable Multi-Gas Detectors

When this detector senses high levels of combustible and toxic gases, it alerts you with an audible alarm, warning light, and vibrating alarm. You can adjust the alarm trigger points to suit your environment. There is also a motion sensor that sounds an alarm if the user becomes disabled.
A calibration check must be performed on the detector before each use to verify that it is working properly. The check requires a regulator and cylinder (sold separately).
Note: LEL is lower explosive limit.
Detects (Measuring Range) | Volume | Temperature Range, °F | Batteries Included | Environmental Rating | Each | |
Acetone, Butane, Hydrogen, Methane, Pentane, Propane, Toluene (0-100% LEL), Oxygen (0-30% Vol.), Carbon Monoxide (0-1,999 ppm), Hydrogen Sulfide (0-200 ppm) | 95 dBA @ 30 cm. | -40° to 140° | Yes | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 0 Groups IIC, IIB, IIA IP68 | 00000000 | 000000000 |
Portable Multi-Gas Detectors with Probe

Use the probe to test the air in a hazardous area before entering. Great for confined spaces. This detector alerts you with an audible alarm, warning light, and vibrating alarm in the presence of combustible and toxic gases. You can adjust the alarm trigger points to suit your environment. There is also a motion sensor that sounds an alarm if the user becomes disabled.
A calibration check must be performed on the detector before each use to verify that it is working properly. The check requires a regulator and cylinder (sold separately).
Note: LEL is lower explosive limit.
Detects (Measuring Range) | Volume | Temperature Range, °F | Batteries Included | Includes | Tube Lg., ft. | Environmental Rating | Each | |
Acetone, Butane, Hydrogen, Methane, Pentane, Propane, Toluene (0-100% LEL), Oxygen (0-30% Vol.), Carbon Monoxide (0-1,999 ppm), Hydrogen Sulfide (0-200 ppm) | 95 dBA @ 30 cm. | -40° to 140° | Yes | Sampling Probe, Tubing Assembly, Rechargeable Lithium Ion Battery for Probe | 25 | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 NEC Zone 0 Groups IIC, IIB, IIA IP68 | 00000000 | 000000000 |
Surface-Mount Multi-Gas Detectors

An audible alarm and warning light alert you to the presence of propane, methane, hydrogen, and carbon monoxide. This detector has a relay for connection to auxiliary alarm systems. A programmable timer allows you to set whether the relay alarm is triggered immediately, or after 4 or 8 minutes of continuous gas exposure. The reset button suspends the alarm and restarts the cycle for 5 to 8 minutes in case of false alarm.
Import regulations restrict sales to the listed areas.
Detects (Trigger Point) , ppm | Volume | Temperature Range, ° F | Ht. | Wd. | Dp. | Voltage | Cord Lg., ft. | Fasteners Included | Mounting Hole Dia. | Cannot Be Sold To | Each | |
Propane (420); Methane (5,000); Hydrogen (200); Carbon Monoxide (150) | 80 dB @ 10 ft. | -20° to 120° | 6 3/4" | 3 1/4" | 1 3/4" | 120V AC | 6 | No | 3/16" | Canada | 0000000 | 0000000 |
Carbon Dioxide Meters

Measure and display real-time indoor ventilation quality. These meters operate with the included universal AC adapter or six AAA batteries. They have automatic baseline calibration. Transfer and view data on your computer using their USB cable and software.
Measuring Range, ppm | Temperature Range, ° F | Mount Type | Ht. | Wd. | Dp. | Power Source | Batteries Included | Number of Batteries Required | Battery Size | Electrical Connection | Voltage | Cord Lg., ft. | Each | |
0-9,999 | 32° to 122° | Portable | 8 1/4" | 2 1/2" | 1 1/2" | Battery, Electric | Yes | 6 | AAA | Plug In | 240V AC | 3 | 000000000 | 0000000 |
Hydrogen Sulfide Detectors

When these detectors sense high levels of hydrogen sulfide, they alert you with an audible alarm, warning light, and vibrating alarm. You can adjust the alarm trigger point to suit your environment.
A calibration check must be performed on the detector before each use to verify that it is working properly. The check requires a regulator, tubing, and cylinder (sold separately).
The detector with a nonreplaceable battery should be thrown away at the end of its two-year lifespan.
Measuring Range, ppm | Volume | Temperature Range, °F | Ht. | Wd. | Dp. | Batteries Included | Environmental Rating | Each | |
Detectors with Nonreplaceable Battery | |||||||||
---|---|---|---|---|---|---|---|---|---|
0-100 | 95 dBA @ 30 cm. | -4° to 122° | 3 1/2" | 2" | 1" | Yes | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Group G NEC Zone 0 Groups IIC, IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IP67 | 00000000 | 0000000 |
Detectors with Replaceable Battery | |||||||||
0-200 | 95 dBA @ 30 cm. | 14° to 104° | 3 1/2" | 2" | 1" | Yes | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 IEC Zone 0 Groups IIC, IIB, IIA IP67 | 00000000 | 000000 |
Propane Detectors

An audible alarm and warning light alert you to the presence of propane. This detector has a relay for connection to auxiliary alarm systems. A programmable timer allows you to set whether the relay alarm is triggered immediately, or after 4 or 8 minutes of continuous gas exposure. The reset button suspends the alarm and restarts the cycle for 5 to 8 minutes in case of false alarm.
Import regulations restrict sales to the listed areas.
Trigger Point, ppm | Volume | Temperature Range, ° F | Ht. | Wd. | Dp. | Voltage | Cord Lg., ft. | Fasteners Included | Mounting Hole Dia. | Cannot Be Sold To | Each | |
4,200 | 80 dB @ 10 ft. | -20° to 120° | 6 3/4" | 3 1/4" | 1 3/4" | 120V AC | 6 | No | 3/16" | Canada | 0000000 | 0000000 |
Oxygen Detectors

When your work area has too much or too little oxygen, these detectors alert you with an audible alarm, warning light, and vibrating alarm. You can adjust the high and low alarm trigger points to suit your environment.
A calibration check must be performed on the detector before each use to verify that it is working properly. The check can be performed with the press of a button.
The detector with a nonreplaceable battery should be thrown away at the end of its two-year lifespan.
Measuring Range, % Vol. | Volume | Ht. | Wd. | Dp. | Temperature Range, °F | Batteries Included | Battery Chemistry | Environmental Rating | Each | |
Detectors with Nonreplaceable Battery | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
0-25 | 95 dBA @ 30 cm. | 3 1/2" | 2" | 1" | -4° to 122° | Yes | Lithium | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Group G NEC Zone 0 Groups IIC, IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IP67 | 00000000 | 0000000 |
Detectors with Replaceable Battery | ||||||||||
0-25 | 95 dBA @ 30 cm. | 3 1/2" | 2" | 1" | -4° to 122° | Yes | Lithium | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Group G NEC Zone 0 Groups IIC, IIB, IIA IEC Zone 0 Groups IIC, IIB, IIA | 00000000 | 000000 |
Batteries (Pkg. of 1) | 0000000 | Pkg. | 00000 |
Stick-On Carbon Monoxide Indicators

Place this indicator anywhere you need to detect and warn about the presence of carbon monoxide. The circle in the center darkens when carbon monoxide is detected and returns to its normal color when exposed to fresh air. Replace indicator every 12 months. An unopened indicator has a shelf life of three years.
Trigger Point, ppm | Ht. | Wd. | Backing Type | Each | |
100 | 2 1/4" | 2 1/4" | Adhesive | 0000000 | 00000 |
Portable Carbon Monoxide Detectors

When these detectors sense high levels of carbon monoxide, they alert you with an audible alarm, warning light, and vibrating alarm. You can adjust the alarm trigger point to suit your environment.
A calibration check must be performed on the detector before each use to verify that it is working properly. The check requires a regulator, tubing, and cylinder (sold separately).
The detector with a nonreplaceable battery should be thrown away at the end of its two-year lifespan.
Measuring Range, ppm | Volume | Temperature Range, °F | Ht. | Wd. | Dp. | Batteries Included | Environmental Rating | Each | |
Detectors with Nonreplaceable Battery | |||||||||
---|---|---|---|---|---|---|---|---|---|
0-500 | 95 dBA @ 30 cm. | -4° to 122° | 3 1/2" | 2" | 1" | Yes | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Group G NEC Zone 0 Groups IIC, IIB, IIA IEC Zone 1 Groups IIC, IIB, IIA IP67 | 00000000 | 0000000 |
Detectors with Replaceable Battery | |||||||||
0-2,000 | 95 dBA @ 30 cm. | 14° to 104° | 3 1/2" | 2" | 1" | Yes | NEC Class I Divisions 1, 2 Groups A, B, C, D NEC Class II Divisions 1, 2 Groups E, F, G NEC Class III Divisions 1, 2 IEC Zone 0 Groups IIC, IIB, IIA IP67 | 00000000 | 000000 |
Methane Detectors

An audible alarm and warning light alert you to the presence of methane. This detector has a relay for connection to auxiliary alarm systems. A programmable timer allows you to set whether the relay alarm is triggered immediately, or after 4 or 8 minutes of continuous gas exposure. The reset button suspends the alarm and restarts the cycle for 5 to 8 minutes in case of false alarm.
Import regulations restrict sales to the listed areas.
Trigger Point, ppm | Volume | Temperature Range, ° F | Ht. | Wd. | Dp. | Voltage | Cord Lg., ft. | Fasteners Included | Mounting Hole Dia. | Cannot Be Sold To | Each | |
10,000 | 80 dB @ 10 ft. | -20° to 120° | 6 3/4" | 3 1/4" | 1 3/4" | 120V AC | 6 | No | 3/16" | Canada | 0000000 | 0000000 |
Surface-Mount Hydrogen Detectors

An audible alarm and warning light alert you to the presence of hydrogen. This detector has a relay for connection to auxiliary alarm systems. A programmable timer allows you to set whether the relay alarm is triggered immediately, or after 4 or 8 minutes of continuous gas exposure. The reset button suspends the alarm and restarts the cycle for 5 to 8 minutes in case of false alarm.
Import regulations restrict sales to the listed areas.
Trigger Point, ppm | Volume | Temperature Range, ° F | Ht. | Wd. | Dp. | Voltage | Cord Lg., ft. | Fasteners Included | Mounting Hole Dia. | Cannot Be Sold To | Each | |
8,000 | 80 dB @ 10 ft. | -20° to 120° | 6 3/4" | 3 1/4" | 1 3/4" | 120V AC | 6 | No | 3/16" | Canada | 0000000 | 0000000 |
Early-Warning Surface-Mount Hydrogen Detectors

This detector triggers a “caution” alert when a small amount of hydrogen is detected and a second “danger” alert if levels continue to rise. When hydrogen concentration reaches 1% by volume, a yellow warning light illuminates and the first relay closes to trigger a remote exhaust fan and/or alarm. When hydrogen reaches 2%, a red warning light illuminates, an alarm sounds, and the second relay closes to activate another remote exhaust fan and/or alarm.
Use the optional remote and cable to keep an eye on the detector’s alert status from a distance. Remote has a buzzer and the same yellow and red warning lights as the detector.
Trigger Point, % Vol. | Volume | Temperature Range, ° F | Ht. | Wd. | Dp. | Electrical Connection | Voltage | Fasteners Included | Mounting Hole Dia. | Each | |
1; 2 | 60 dB @ 10 ft. | 14° to 104° | 7" | 4 3/4" | 2 1/2" | Screw Terminals | 120V AC, 240V AC | No | 3/16" | 00000000 | 000000000 |
Combustion Efficiency Meters
Also known as a combustion analyzer, this meter measures boiler and furnace combustion efficiency. It automatically calibrates to normal atmospheric oxygen.

Measurement Range | Calculated Range | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
For Use On | Ambient Temp. | Flue Gas Temp. | Flue Gas Oxygen | Carbon Monoxide, ppm | Combustion Efficiency | Carbon Dioxide | Air Free Carbon Monoxide, ppm | Excess Air | Accuracy | Batteries Included | Each | |
Kerosene, Natural Gas, Oil, Propane | 25° to 110° F | -4° to 1200° F | 0-20.9% | 0-2,000 | 0.1%-100% | 0-15% | 0-9,999 | 0-250% | ±0.3% of Oxygen Content | Yes | 0000000 | 0000000 |
Carbon Monoxide Detectors for Fire Alarm Systems

When this detector senses carbon monoxide, it sends a signal to your control panel and sounds an alarm. Multiple units can be linked in tandem so all detectors will sound when any one of them is triggered.
Import regulations restrict sales to the listed areas.
Volume | Mount Type | Lg. | Wd. | Dp. | Tandem Signaling Capable | Electrical Connection | Voltage | Current | Specifications Met | Cannot Be Sold To | Each | |
85 dBA @ 10 ft. | Surface | 4 1/2" | 3" | 1 1/2" | Yes | Screw Terminals | 12V DC 24V DC | 0.04 A @ 12 V DC 0.04 A @ 24 V DC | UL Listed | Canada | 000000 | 0000000 |
Environmental-Monitoring Modules for Development Boards
Keep equipment running and working conditions safe—these modules add air quality tracker capabilities to your development board. Each module gathers data on air conditions, ranging from temperature and humidity to carbon dioxide or volatile organic compound (VOC) levels. These modules easily connect to boards and other components with Qwiic cords or by soldering.
Modules with a temperature, humidity, and air quality sensor help you make sure the air is healthy in your facility. They directly measure the amount of carbon dioxide in the air.
Modules with a temperature, humidity, air quality, and barometer sensor give you the most comprehensive picture of air conditions in your facility. They directly measure the amount of VOCs and give you an estimated measurement of carbon dioxide based on VOC levels. They monitor air quality using Germany’s Air Quality Index (AQI).

Measures | Temp. Range, °C | Relative Humidity | Carbon Dioxide Concentration | Input Voltage | I2C Address | No. of Qwiic Connections | Lg. | Wd. | Each | |
Temperature, Relative Humidity, Carbon Dioxide | -10° to 60° | 0%-100% | 0-40,000 ppm | 2.4-5.5V DC | 0x62 | 2 | 1" | 1" | 0000000 | 000000 |

Measures | Temp. Range, °C | Relative Humidity | Equivalent Carbon Dioxide Concentration | Total Volatile Organic Compound | Barometric Pressure | Input Voltage | I2C Address | No. of Qwiic Connections | Lg. | Wd. | Each | |
Temperature, Relative Humidity, Equivalent Carbon Dioxide, Total Volatile Organic Compound Concentration, Air Quality Index, Barometric Pressure | 0° to 65° | 20%-80% | 400-650,000 ppm | 0-65,000 ppb | 8.9-32.5 in. of Hg | 1.2-3.6V DC | 0x52, 0x53, 0x76, 0x77 | 2 | 1" | 1" | 0000000 | 000000 |
Air Filter Monitors for Supplied-Air Respirators for Plant Air Lines
Track the quality of incoming air as it travels from your air line to your respirator. These monitors display air-quality data, including carbon monoxide and water vapor levels, and sound an alarm if the air is unsafe to breathe. They also filter the air three times before it reaches you to remove oil, water, and solid particles.
Monitors with data-logging capabilities record air-quality data and calibration results onto a removable USB drive. Download your data from the USB for compliance reports and recordkeeping. They have a large color screen to easily view the quality and status of air as it flows through the filter. When it is time to calibrate the filter monitor, the screen gives clear, step-by-step instructions.
Calibration kits (sold separately) come with everything you need to test the accuracy of the filter monitor, including a regulator, tubing, and fittings. The components are packed in a carrying case. Air filter monitors should be calibrated monthly to ensure they’re working properly.


Monitors | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
O'all | Calibration Kits | Replacement Filters | ||||||||||||||||||
For Use With | Inlet Coupling Size | Outlet Coupling Size | Max. Flow Rate | Max. Pressure, psi | Pressure Regulating Range , psi | Regulating Accuracy, psi | Wd. | Ht. | Max. Temp., °F | Battery Type | Batteries Included | Battery Size | No. of Batteries Required | Cord Lg., ft. | Each | Each | Each | |||
Plastic Housing | ||||||||||||||||||||
Quick-Disconnect Male Inlet × Quick-Disconnect Female Outlet | ||||||||||||||||||||
Solid Particles, Oil, Water | 1/2 | 1/4 | 15 cfm @ 100 psi | 150 | 0-160 | ±1 | 19" | 13" | 120° | Disposable | No | AA | 8 | 10 | 0000000 | 000000000 | 0000000 | 0000000 | 0000000 | 0000000 |


Monitors | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
O'all | Calibration Kits | Replacement Filters | ||||||||||||||||
For Use With | Inlet Coupling Size | Outlet Coupling Size | Max. Flow Rate | Max. Pressure, psi | Pressure Regulating Range , psi | Regulating Accuracy, psi | Wd. | Ht. | Max. Temp., °F | Battery Type | Batteries Included | Cord Lg., ft. | Each | Each | Each | |||
Plastic Housing | ||||||||||||||||||
Quick-Disconnect Male Inlet × Quick-Disconnect Female Outlet | ||||||||||||||||||
Solid Particles, Oil, Water | 1/4 | 1/4 | 15 cfm @ 100 psi | 150 | 0-160 | ±1 | 18 1/2" | 13" | 100° | Rechargeable | Yes | 7 | 0000000 | 000000000 | 0000000 | 0000000 | 0000000 | 0000000 |