Gas Analyzers | McMaster-Carr

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38 Products

Combustion Analyzers

These analyzers measure boiler and furnace combustion efficiency. They automatically calibrate to normal atmospheric oxygen.

	Measurement Range				Calculated Range
For Use On	Ambient Temp., ° F	Flue Gas Temp., ° F	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	-4 to 1,200	0% to 20.9%	0 to 2,000	0.1% to 100%	0% to 15%	0 to 9,999	0% to 250%	±0.3% of Oxygen Content	Yes	3937K35	0000000

Replacements for Combustion Analyzers


Replacement Oxygen Sensor	3937K37	Each	0000000
Replacement AA Batteries (Pkg. of 4)	71455K53	Pkg. of 4	0000

Portable Multi-Gas Detectors

When these detectors sense high levels of combustible and toxic gases, they alert 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 detectors before each use to verify that they are working properly. The check requires a regulator and cylinder (sold separately).

Note: LEL is lower explosive limit.

Detects (Measuring Range)	Volume (Sound) @ Distance	Temp. Range, ° F	Batteries Included	Hazardous Location Rating	Enclosure Rating		Each
Acetone, Butane, Hydrogen, Methane, Pentane, Propane, Toluene (Methylbenzene) (0% to 100% LEL) Oxygen (0% to 30% Vol.) Carbon Monoxide (0 ppm to 1,999 ppm) Hydrogen Sulfide (0 ppm to 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 AEx Da Ia IIC T4 Ga Ex Da Ia IIC T4 Ga	IP68	18995T42	000000000

Accessories for Multi-Gas Detectors

		Each
Calibration Regulator	18995T916	0000000
Calibration Cylinder	18995T47	000000
Calibration Tubing	18995T935	00000

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.

										Electrical
Carbon Monoxide Concentration Measured Range, ppm	Temp. Range, ° F	Mobility	Ht.	Wd.	Dp.	Power Source	Batteries Included	No. of Batteries Req.	Battery Size	Connection	No. of Blades	Voltage, V AC	Cord Lg., ft.		Each
0 to 9,999	32 to 122	Portable	8 1/4"	2 1/2"	1 1/2"	Battery, Electric	Yes	6	AAA	Straight Blade	2	240	3	39035K691	0000000

Portable Multi-Gas Detectors with Probe

Use the probe on these detectors to test the air in a hazardous area before entering. Great for confined spaces. Detectors alert 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 these detectors before each use to verify that they are working properly. The check requires a regulator and cylinder (sold separately).

Note: LEL is lower explosive limit.

Detects (Measuring Range)	Volume (Sound) @ Distance	Temp. Range, ° F	Batteries Included	Includes	Tube Lg., ft.	Hazardous Location Rating	Enclosure Rating		Each
Acetone, Butane, Hydrogen, Methane, Pentane, Propane, Toluene (Methylbenzene) (0% to 100% LEL) Oxygen (0% to 30% Vol.) Carbon Monoxide (0 ppm to 1,999 ppm) Hydrogen Sulfide (0 ppm to 200 ppm)	95 dBA @ 30 cm	-40 to 140	Yes	Sampling Probe, Tubing Assembly, Battery	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 AEx Da Ia IIC T4 Ga Ex Da Ia IIC T4 Ga	IP68	18995T44	000000000

Accessories and Replacements for Multi-Gas Detectors

		Each
Replacement Sampling Probe	18995T28	0000000
Calibration Regulator	18995T916	000000
Calibration Cylinder	18995T47	000000
Replacement 25-ft.Tubing Assembly	18995T26	000000

Propane Detectors

An audible alarm and warning light alert you to the presence of propane. These detectors have 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.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

Trigger Point, ppm	Volume (Sound) @ Distance	Temp. Range, ° F	Ht.	Wd.	Dp.	Voltage, V AC	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"	120	6	No	3/16"	Canada	6631T41	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 Temperature, Humidity, and Air Quality Sensor

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.

	Output Data
	Resolution, bit	Freq., Hz	Measures	Temp. Range, ° C	RH	Carbon Dioxide Concentration Measured, ppm	Input Voltage, V DC	I2C Address	Connection Method	No. of Qwiic Connections	Lg.	Wd.		Each
I²C Communication Protocol—Qwiic Connection



		16	0.2	Temperature, Relative Humidity, Carbon Dioxide Level	-10 to 60	0% to 100%	0 to 40,000	2.4 to 5.5	0x62	Solder	2	1"	1"	7126N11	000000

Modules with Temperature, Humidity, Air Quality, and Barometer Sensor

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).

	Temp. Range, ° C	RH	Equiv. Carbon Dioxide Concentration Measured, ppm	Total Volatile Organic Compound, ppb	Barometric Pressure, in. Hg	Input Voltage, V DC	I2C Address	Connection Method	No. of Qwiic Connections	Lg.	Wd.		Each
I²C Communication Protocol—Qwiic Connection



	Temperature, Relative Humidity, Equivalent Carbon Dioxide, Total Volatile Organic Compound Concentration, Air Quality Index, Barometric Pressure	0 to 65	20% to 80%	400 to 650,000	0 to 65,000	8.9 to 32.5	1.2 to 3.6	0x52 0x53 0x76 0x77	Solder	2	1"	1"	7126N14	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.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

Trigger Point, ppm	Volume (Sound) @ Distance	Temp., ° F	Ht.	Wd.	Dp.	Voltage, V AC	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"	120	6	No	3/16"	Canada	6631T43	0000000

Surface-Mount Multi-Gas Detectors

An audible alarm and warning light alert you to the presence of propane, methane, hydrogen, and carbon monoxide. These detectors have 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.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

Detects (Trigger Point)	Volume (Sound) @ Distance	Temp. Range, ° F	Ht.	Wd.	Dp.	Voltage, V AC	Cord Lg., ft.	Fasteners Included	Mounting Hole Dia.	Cannot Be Sold To		Each
Propane (420 ppm); Methane (5,000 ppm); Hydrogen (200 ppm); Carbon Monoxide (150 ppm)	80 dB @ 10 ft.	-20 to 120	6 3/4"	3 1/4"	1 3/4"	120	6	No	3/16"	Canada	6631T18	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.

1% Trigger Point—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.

2% Trigger Point—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.

Trigger Point	Volume (Sound) @ Distance	Temp. Range, ° F	Ht.	Wd.	Dp.	Electrical Connection	Voltage, V AC	Fasteners Included	Mounting Hole Dia.		Each
1%; 2%	60 dB @ 10 ft.	14 to 104	7"	4 3/4"	2 1/2"	Screw Terminal	120, 240	No	3/16"	71095K71	000000000

Accessories for Hydrogen Detectors

Remote with Buzzer—Use the 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.

25-ft. Cable for Remote—Use the remote and cable to keep an eye on the detector’s alert status from a distance.

		Each
Remote with Buzzer	71095K24	0000000
25-ft. Cable for Remote	5703T411	0000

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).

Nonreplaceable Batteries—The detector with a nonreplaceable battery should be thrown away at the end of its two-year lifespan.

	Volume (Sound) @ Distance	Temp. Range, ° F	Ht.	Wd.	Dp.	Batteries Included	Hazardous Location Rating	Enclosure Rating		Each
Nonreplaceable Batteries



	0 to 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 IECEx Ex Ia IIC T4 AEx Ia IIC T4 ATEX II 2 G Ex Ia IIC T4 Gb	IP67	18995T85	0000000


	Replaceable Batteries



			0 to 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 IECEx Ex Ia IIC T4 Ga ATEX II 1 G Ex Ia IIC T4 Ga	IP67	18995T19	000000

Accessories for Hydrogen Sulfide Detectors

		Each
Calibration Tubing	18995T935	000000
Gas Detector Regulators	18995T916	000000
Gas Detector Cylinders for Nonreplaceable Battery Detectors	18995T924	000000
Gas Detector Cylinders for Replaceable Battery Detectors	18995T16	000000

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.

Detectors with Nonreplaceable Battery—The detector with a nonreplaceable battery should be thrown away at the end of its two-year lifespan.

	Oxygen Detectors												Batteries
	Oxygen Volume Percent Concentration Measured	Volume (Sound) @ Distance	Ht.	Wd.	Dp.	Temp. Range, ° F	Batteries Included	Battery Chemistry	Hazardous Location Rating	Enclosure Rating		Each	Pkg. Qty.		Pkg.
Detectors with Nonreplaceable Battery



		0% to 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 AEx Ia IIC T4 ATEX II 2 G Ex Ia IIC T4 Gb IECEx Ex Ia IIC T4	IP67	18995T81	0000000	—	———	0


		Detectors with Replaceable Battery



				0% to 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 AEx Ia IIC T4 ATEX II 1 G Ex Ia IIC T4 Ga ATEX II 2 G Ex Ia IIC T4 Gb IECEx Ex Ia IIC T4	—	18995T92	000000	1	7821K72	00000

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 Low-Battery Alarm


Closed	Open

Respirator Filter Monitor Calibration Kits—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.

	Respirator Filter Monitors																	Respirator Filter Monitor Calibration Kits		Replacement Filters
								Overall
	For Use With	Inlet Coupling Size	Outlet Coupling Size	Max. Flow Rate @ Pressure	Max. Pressure, psi	Pressure Regulation Range, psi	Regulating Accuracy	Wd.	Ht.	Max. Temp., ° F	Battery Type	Batteries Included	Battery Size	No. of Batteries Req.	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 ft³/min @ 100 psi	150	0 to 160	±1 psi	19"	13"	120	Disposable	No	AA	8	10	6793N17	000000000	6793N13	0000000	6793N12	0000000

Monitors with Data Logging Capabilities and Low-Battery Alarm


Closed	Open

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.

	Respirator Filter Monitors																Respirator Filter Monitor Calibration Kits		Replacement Filters
								Overall
	For Use With	Inlet Coupling Size	Outlet Coupling Size	Max. Flow Rate @ Pressure	Max. Pressure, psi	Pressure Regulation Range, psi	Regulating Accuracy	Wd.	Ht.	Max. Temp., ° F	Battery Type	Batteries Included	No. of Batteries Req.	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 ft³/min @ 100 psi	150	0 to 160	±1 psi	18 1/2"	13"	100	Rechargeable	Yes	1	7	6793N14	000000000	6793N15	0000000	6793N16	0000000

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.

Mounting Profile	Ht.	Wd.	Backing Type		Each



100	Surface	2 1/4"	2 1/4"	Adhesive	1085T85	00000

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.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

Mounting Profile	Lg.	Wd.	Dp.	Tandem Signaling Capable	Electrical Connection	Voltage, V DC	Current @ Voltage	Certification	Cannot Be Sold To		Each



85 dBA @ 10 ft.	Surface	4 1/2"	3"	1 1/2"	Yes	Screw Terminal	12 24	0.04 amp @ 12V DC 0.04 amp @ 24V DC	UL Listed	Canada	1030N1	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.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

						Electrical
Trigger Point, ppm	Volume (Sound) @ Distance	Temp. Range, ° F	Ht.	Wd.	Dp.	Connection	No. of Blades	Voltage, V AC	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"	Straight Blade	2	120	6	No	3/16"	Canada	6631T42	0000000

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).

Nonreplaceable Batteries—The detector with a nonreplaceable battery should be thrown away at the end of its two-year lifespan.

	Volume (Sound) @ Distance	Temp., ° F	Ht.	Wd.	Dp.	Batteries Included	Certification	Hazardous Location Rating	Enclosure Rating		Each
Nonreplaceable Batteries



	0 to 500	95 dBA @ 30 cm	-4 to 122	3 1/2"	2"	1"	Yes	CSA-US Certified CSA Certified CE Marked	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 IECEx Ex Ia IIC T4 ATEX II 2 G Ex Ia IIC T4 Gb AEx Ia IIC T4	IP67	18995T83	0000000


	Replaceable Batteries



			0 to 2,000	95 dBA @ 30 cm	14 to 104	3 1/2"	2"	1"	Yes	CSA-US Certified CSA Certified CE Marked	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 IECEx Ex Ia IIC T4 Ga ATEX II 1 G Ex Ia IIC T4 Ga	IP67	18995T15	000000

Accessories and Replacements for Carbon Monoxide Detectors