Oxygen Sensors | McMaster-Carr

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Detects

Toluene (Methylbenzene)

Measures

Ambient Temperature

Carbon Dioxide Level

Carbon Monoxide Level

Combustion Efficiency

Power Source

Environment

System of Measurement

Inch

Maximum Temperature

Less than 500° F

1,000° F to 1,999.9° F

For Use With

Certification

C-UL Recognized Component

UL Recognized Component

Batteries Replaceable

Yes

Hazardous Location Protection Type

Display Type

For Use On

Maximum Oxygen Volume Percent Concentration Measured

REACH

Export Control Classification Number (ECCN)

1A995

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Minimum Temperature

Alert Type

Height

RoHS

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

Battery Chemistry

Width

Hazardous Location Rating

ATEX Hazardous Location Zone Rating

Ex Da Ia IIC T4 Ga

IEC Hazardous Location Rating

IECEx Ex Ia IIC T4

NEC Hazardous Location Rating

NEC Hazardous Location Zone (AEx) Rating

Batteries Included

Adjustability

30 Products

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

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 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

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

Pressure Transmitters for Oxygen

Adhere to safety standards and monitor pressure when working with high concentrations of oxygen. These transmitters are cleaned following ASME B40.100 IV guidelines and are sealed in an airtight bag to prevent contamination before use. Also known as transducers, they convert pressure to an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls. For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the transmitter's pressure range and output signal. As pressure increases, the output signal from the transmitter will increase. Transmitters will only provide accurate readings within the rated pressure range.

These transmitters are rated NEMA 4X and IP65 for protection from dust, weather, washdown, and corrosion. UL and C-UL recognized components and CE marked, they also meet American, Canadian, and European safety standards.

With an output current, they connect using two wires. The same wire is used to send a signal to the receiver and to power the transmitter. Current doesn’t lose signal over long distances and isn’t affected by electrical interference from other devices.

4 mA to 20 mA Output Current—Wire Lead Connection

Image of Product. Front orientation. Contains Annotated. Pressure Transmitters. Pressure Transmitters for Oxygen.

Input Voltage, V DC	Ht.	Wd.	Enclosure Rating	Certification	For Use With	Accuracy	Housing Material	Connection Material	Temp. Range, ° F		Each







1/4 NPT Male Pipe Connection

0 to 30	60	60	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A11	0000000


0 to 60	120	120	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A12	000000
0 to 100	200	200	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A13	000000
0 to 300	600	600	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A14	000000
0 to 500	1,000	1,000	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A15	000000
0 to 1,000	2,000	2,000	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A16	000000
0 to 1,500	3,000	3,000	9 to 36	2 3/8"	1 5/16"	IP65, NEMA 4X	UL Recognized Component, C-UL Recognized Component, CE Marked	Oxygen	±1.0%	Glass-Filled Nylon	304 Stainless Steel	-40 to 255	3914A17	000000

Pressure Switches for Oxygen

Cleaned to ASTM G93 requirements and then bagged, these switches meet the strict cleaning standards required for oxygen service lines. Removing all contaminants extends the life of the switch and helps maintain a safe environment.

When a set pressure is reached, these switches can turn equipment on and off, activate automated controls, or signal alarms. They have an internal setpoint adjustment with a sliding cover to prevent accidental setting changes. They’re single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed).

NEMA rated, they seal out dust and water from washdowns and the weather. These switches also meet UL 508, are CE marked, and are UL and C-UL recognized components, so they meet American, Canadian, and European safety standards.

Wire Lead Connection

	Approx. Difference Between Set Point and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current @ Voltage	Process Temp. Range, ° F	Connection Material	For Use With	Enclosure Rating	Certification		Each
1/8 Threaded NPT Male Pipe



	4 to 50	3.5	1,000	3,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K12	0000000


	10 to 150	6	1,500	3,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K14	000000
	30 to 600	34	2,500	3,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K16	000000


	1/4 Threaded NPT Male Pipe



			100 to 1,500	120	8,000	10,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K17	000000


			180 to 3,000	225	8,000	10,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K18	000000
			400 to 4,700	350	8,000	10,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K19	000000
			4,000 to 7,500	675	10,000	12,000	±1.5%	5 amp @ 125V AC 5 amp @ 250V AC 3 amp @ 30V DC 250 mA @ 125V DC	0 to 200	Brass	Oxygen	NEMA 4	C-UL Recognized Component, CE Marked, UL Recognized Component	3427K21	000000

Economy Vacuum Switches

Choose these switches when you need reliable switching but not high accuracy. When they reach a set vacuum, they turn equipment on and off, signal automatic controls, or trigger alarms. They are single pole, double throw (SPDT) and can be installed to turn one circuit from off to on (normally open) or from on to off (normally closed). All meet American and European safety standards since they're UL recognized components and CE marked.

	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current @ Voltage	Process Temp. Range, ° F	Connection Material	For Use With		Each
Spade-Terminal







	1/8 NPT Male Pipe Connection

	2.7 to 28.2	3	0	0	±5%	5 amp @ 250V AC	-30 to 185	Chrome-Plated Zinc Alloy	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Inert Gas, Nitrogen, Oil, Oxygen, Water	8128N12	0000000

Sanitary Pressure and Vacuum Switches

When these 3-A certified switches reach a set pressure or vacuum, they trigger controls and alarms in food-processing, pharmaceutical, and biotech lines. They have a sleeve to shield internal parts from water and contaminants. Their surfaces are polished and their seams are continuously welded, so cleaning is easy and there’s little room for bacteria to grow. Made of 316 stainless steel, these switches stand up to harsh cleaners and sanitizers without rusting. Rated IP67 and NEMA 6, they’re dust tight and protected from washdowns and temporary submersion.

They connect using the same quick-clamp fittings (also known as tri-clamp fittings) that are common in sanitary lines, because they’re easy to take apart for cleaning. This end has a diaphragm that protects from corrosion and covers threads to keep them clean. The diaphragm is filled with 99.5% pure USP food-grade glycerin, reducing the risk of contamination if the diaphragm fails. The serial number is laser etched on the diaphragm to reduce crevices.

Twist the adjustable setpoint ring to make quick changes. These switches are single pole, double throw (SPDT) and can be installed to turn one circuit from off to on (normally open) or from on to off (normally closed).

All have a material certificate with a traceable lot number and a calibration certificate traceable to NIST.

	Setpoint
	Pressure, psi	Vacuum, in. Hg	Approx. Difference Between Set Point and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current @ Voltage	Process Temp. Range, ° F	Connection Material	For Use With	Enclosure Rating	Certification		Each
Wire Lead Connection







				For 1 1/2" OD Quick Clamp Tube

				0 to 15	0 to 30	3	15	1,000	±2%	3 amp @ 28V DC 5 amp @ 125V AC 5 amp @ 250V AC	-40 to 212	316 Stainless Steel	Argon, Beverage, Diesel Fuel, Food, Gasoline, Hydraulic Fluid, Inert Gas, Natural Gas, Nitrogen, Oil, Oxygen, Water	IP67, NEMA 6	UL Listed	8834N201	0000000




						For 2" OD Quick Clamp Tube

						0 to 15	0 to 30	3	15	1,000	±2%	3 amp @ 28V DC 5 amp @ 125V AC 5 amp @ 250V AC	-40 to 212	316 Stainless Steel	Argon, Beverage, Diesel Fuel, Food, Gasoline, Hydraulic Fluid, Inert Gas, Natural Gas, Nitrogen, Oil, Oxygen, Water	IP67, NEMA 6	UL Listed	8834N206	000000