Oxygen Sensors | McMaster-Carr

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	Detects Detects

	For Use With For Use With

	Detector Signal Type Detector Signal Type

Audible Alarm

Signal Light

Vibrating Alarm

	Batteries Replaceable Batteries Replaceable

Yes

	Mount Type Mount Type

Portable

	Environment Environment

	System of Measurement System of Measurement

Inch

	Width Width

	Power Source Power Source

Battery

	Environmental Rating Environmental Rating

IEC Zone 0 Groups IIC, IIB,
IIA

IEC Zone 1 Groups IIC, IIB,
IIA

IP65

IP67

IP68

NEC Class I Divisions 1, 2
Groups A, B, C, D

NEC Class II Divisions 1, 2
Group G

NEC Class II Divisions 1, 2
Groups E, F, G

NEC Class III Divisions
1, 2

NEC Zone 0 Groups IIC,
IIB, IIA

NEMA 4

NEMA 4X

NEMA 6

	Protection Type Protection Type

Intrinsic Safety

Explosion Proof

Flameproof

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Specifications Met Specifications Met

3-A Sanitary Certified

	Height Height

	Depth Depth

1 3/8"

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant with
Exemptions

RoHS Compliant

	Batteries Included Batteries Included

Yes

	Maximum Temperature Maximum Temperature

122° F

140° F

255° F

	Minimum Temperature Minimum Temperature

-40° F

-4° F

	Display Display

LCD

	NEC Hazardous Location Temperature Classification NEC Hazardous Location Temperature Classification

T4 (275° F)

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Measures Measures

Ambient Temperature

Carbon Dioxide

Carbon Monoxide

Combustion Efficiency

30 Products

About Pressure Transmitters

About Pressure Switches

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.

Detectors with Nonreplaceable Battery
Measuring Range, % Vol.	Volume	Ht.	Wd.	Dp.	Temperature Range, °F	Batteries Included	Battery Chemistry	Environmental Rating		Each
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.

000000

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

Replacement Sampling Probe	00000000	Each	0000000
Calibration Regulator	000000000	Each	000000
Replacement 25-ft.Tubing Assembly	00000000	Each	000000
Calibration Cylinder	00000000	Each	000000

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	0000000

Calibration Cylinders	00000000	Each	0000000
Calibration Tubing	000000000	Each	00000
Calibration Regulators	000000000	Each	000000

Pressure Transmitters for Oxygen

For Use With: Oxygen
Accuracy: ±1.0%
Pipe Connection: NPT Male
Housing Material: Glass-Reinforced Nylon
Connection Material: 304 Stainless Steel
Temperature Range: -40° to 255° F

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 a current output, 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.

For technical drawings and 3-D models, click on a part number.

4-20mA Current Output—Wire Leads
Pressure Range, psi	Maximum Continuous Pressure, psi	Maximum Short-Term Pressure, psi	Input Voltage	Pipe Size	Ht.	Wd.	Environmental Rating		Each
0-30	60	60	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	0000000
0-60	120	120	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	000000
0-100	200	200	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	000000
0-300	600	600	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	000000
0-500	1,000	1,000	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	000000
0-1,000	2,000	2,000	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	000000
0-1,500	3,000	3,000	9-36V DC	1/4	2 3/8"	1 5/16"	IP65, NEMA 4X	0000000	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.

For technical drawings and 3-D models, click on a part number.

Wire Leads
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temperature Range, °F	Connection Material	For Use With	Environmental Rating		Each
1/8 NPT Male Pipe Connection
4-50	3.5	1,000	3,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	0000000
10-150	6	1,500	3,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	000000
30-600	34	2,500	3,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	000000
1/4 NPT Male Pipe Connection
100-1,500	120	8,000	10,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	000000
180-3,000	225	8,000	10,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	000000
400-4,700	350	8,000	10,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	000000
4,000-7,500	675	10,000	12,000	±1.5%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 30 V DC 250 mA @ 125 V DC	0° to 200°	Brass	Oxygen	NEMA 4	0000000	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 listed, UL recognized components, and CE marked.

For technical drawings and 3-D models, click on a part number.

Spade Terminals
Setpoint, in. of Hg	Approximate Difference Between Setpoint and Reset Point, in. of Hg	Maximum Continuous Pressure, psi	Maximum Short-Term Pressure, psi	Accuracy	Maximum Switching Current	Process Temperature Range, °F	Connection Material	For Use With		Each
1/4 NPT Male Pipe Connection
28-6	8.5	600	750	±5.5%	15 A @ 250 V AC	-30° to 185°	Chrome-Plated Zinc	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Inert Gas, Nitrogen, Oil, Oxygen, Water	0000000	000000

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 certificate with a traceable lot number and material test report.

Setpoint
Pressure, psi	Vacuum, in. of Hg	Approximate Difference Between Setpoint and Reset Point, psi	Maximum Continuous Pressure, psi	Maximum Short-Term Pressure, psi	Accuracy	Maximum Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Specifications Met		Each
Wire Leads
1 1/2" Tube OD Quick-Clamp Connection
0-15	30-0	3	15	1,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 28 V DC	-40° to 212°	316 Stainless Steel	Argon, Beverage, Diesel Fuel, Food, Gasoline, Hydraulic Fluid, Inert Gas, Natural Gas, Nitrogen, Oil, Oxygen, Water	3-A Certified 74-07, UL Listed	00000000	0000000
2" Tube OD Quick-Clamp Connection
0-15	30-0	3	15	1,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC 3 A @ 28 V DC	-40° to 212°	316 Stainless Steel	Argon, Beverage, Diesel Fuel, Food, Gasoline, Hydraulic Fluid, Inert Gas, Natural Gas, Nitrogen, Oil, Oxygen, Water	3-A Certified 74-07, UL Listed	00000000	000000

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

Replacement Oxygen Sensor	0000000	Each	0000000
Replacement AA Batteries (Pkg. of 4)	00000000	Pkg.	0000

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About Pressure Transmitters

About Pressure Switches

Oxygen Detectors

Portable Multi-Gas Detectors with Probe

Portable Multi-Gas Detectors

Pressure Transmitters for Oxygen

Pressure Switches for Oxygen

Economy Vacuum Switches

Sanitary Pressure and Vacuum Switches

Combustion Efficiency Meters