2 psi Pressure Gauges | McMaster-Carr

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For Use With

Measurement Unit

Pounds per Square Inch

Pipe Size

Maximum Pressure

1,000 psi to 1,999.9 psi

2,000 psi to 9,999.9 psi

10,000 psi to 19,999.9 psi

20,000 psi or greater

Less than 10,000 kPa

10,000 kPa to 19,999 kPa

20,000 kPa to 29,999 kPa

30,000 kPa to 99,999 kPa

100,000 kPa or greater

Not Rated

Measures

Differential Pressure

Band Color

Minimum Pressure

Graduations

Maximum Pressure Differential

Case Color

Pressure Numeric Increments

Dial Type

Fitting Connection

Display Type

Connection Finish

Case Material

Connection Material

System of Measurement

Thread Type

Dial Diameter

Shape

Material

RoHS

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

REACH

33 Products

About Pressure Transmitters

About Air Preparation

About Pressure Gauges

Low-Pressure Differential Gauges with Color Indicator

A band of green, yellow, and red provides a clear indication of changes in differential pressure. Gauges are commonly used to indicate clogged filters.

Low-Pressure Differential Gauges with Color Indicator

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, Nitrogen, Hydrogen, Argon, and Acetylene
Accuracy: ±5% Full Scale (Not Graded)

	Pressure Range, psi
Pipe Size	Green Band	Yellow Band	Red Band	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F	Ht.	Wd.	Dp.	Case Color		Each
NPT Female
1/4	0-2	2-2.5	2.5-3.5	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	0000000

Medium-Pressure Differential Gauges

Popular for use with natural gas, these gauges measure pressure differences in pipelines and filters with a maximum pressure of 1,500 psi.

Gauges with 316 stainless steel case are more corrosion resistant than gauges with an aluminum case.

Aluminum Case with Aluminum Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, Gasoline, and Natural Gas
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 2	0.1	0.5

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F		Each
2 1/2"	1/4	1,500	0° to 150°	0° to 200°	000000	0000000
4 1/2"	1/4	1,500	0° to 150°	0° to 200°	000000	000000

316 Stainless Steel Case with 316 Stainless Steel Connection—Single Scale (psi)

For Use With: Water, Hydraulic Fluid, Gasoline, and Natural Gas
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 2	0.1	0.5

NPT Female
Dial Diameter	Pipe Size	Max. Pressure, psi	Environment Temp. Range, °F	Process Temp. Range, °F		Each
2 1/2"	1/4	1,500	0° to 150°	0° to 200°	000000	0000000
4 1/2"	1/4	1,500	0° to 150°	0° to 200°	000000	000000

Differential Pressure Transmitters with Dial Indicator for Air

For Use With: Air
Accuracy: ±2%
Pipe Connection: NPT Female
Housing Material: Aluminum
Connection Material: Aluminum
Temperature Range: 20° to 120° F

Check the difference in air pressure between two inputs at the source using the dial indicator or remotely using a receiver. The dial indicator on these transmitters operates independently and shows differential pressure in real time for troubleshooting. Also known as transducers, these transmitters convert pressure to an electrical signal that is interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls. They are often used to indicate a filter is clogged or help you maintain a certain air pressure in ovens, dryers, and HVAC systems. All are CE marked, so they meet European safety standards.

When measuring pressure in ductwork, pair them with a static pressure probe.

For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the transmitter's differential pressure range and output signal. As differential pressure increases, the output signal from the transmitter will increase. Transmitters will only provide accurate readings within the rated pressure range. Connect them 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.

						Mounting Holes
Differential Pressure Range , in. of H2O	Max. Input Pressure, psi	Input Voltage	Pipe Size	For No. of Wires	Mounting Hardware Included	Thread Size	No. of	Dia.	Specifications Met		Each
4-20 mA Output Signal—Screw Terminals
0-2	2	10-35V DC	1/8	2	No	6-32	3	5 1/2"	CE Marked	000000000	0000000
0-3	2	10-35V DC	1/8	2	No	6-32	3	5 1/2"	CE Marked	000000000	000000
0-10	2	10-35V DC	1/8	2	No	6-32	3	5 1/2"	CE Marked	000000000	000000

High-Accuracy Differential Pressure Transmitters

For Use With: Air, Water
Accuracy: ±0.25%
Pipe Connection: NPT Female
Housing Material: Aluminum
Connection Material: 17-4 PH Stainless Steel
Temperature Range: 0° to 175° F

At least twice as accurate as standard transmitters, these transmitters sense differential pressure at an accuracy of ±0.25%. Use them in laboratories or testing applications where the difference in pressure between two points needs to be measured with high accuracy. These transmitters are often used to indicate a filter is clogged or help you maintain a certain pressure in pumps, HVAC, cooling, and other air and liquid systems. They convert differential pressure to an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls to monitor pressure or control equipment. All transmitters are rated NEMA 4 for protection in washdown environments.

For your receiving device to interpret the signal from the transmitter, you will need to calibrate it for the pressure range and output signal of the transmitter. As the differential increases, the output signal from the transmitter will increase. Transmitters will only provide accurate readings within the rated pressure range. Connect them 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.

					Mounting Holes
Differential Pressure Range, psi	Max. Input Pressure, psi	Input Voltage	Pipe Size	Mounting Hardware Included	Dia.	No. of	Ht.	Wd.	Environmental Rating		Each
4-20 mA Output Signal—Screw Terminals
0-2	350	9-30V DC	1/4	Yes	5/32"	4	3 1/8"	2 7/16"	NEMA 4	0000000	000000000

Back-Pressure-Regulating Valves for Air and Inert Gas

For Use With: Air, Inert Gas
Temperature Range: 0° to 150° F

Often used to protect equipment running on air compressors, these valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the unthreaded relief port. Adjust the set pressure within the range. Valves have two gauge ports.

Inlet			Outlet		Gauge Port
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pipe Size	Location	End-to-End Lg.	Outlet Pressure Range, psi		Each
NPT Female
Aluminum Body—Buna-N Diaphragm and Seal
1/4	Side	250	1/4	Side	1/4	Side	3"	0 to 2	0000000	0000000
3/8	Side	250	3/8	Side	1/4	Side	3"	0 to 2	0000000	000000
1/2	Side	250	1/2	Side	1/4	Side	3"	0 to 2	0000000	000000

High-Flow Precision Compressed Air Regulators

With a greater flow capacity than our standard precision compressed air regulators, use these regulators to adjust and maintain air pressure in sensitive high-flow applications where constant, consistent pressure is important. Install in your air line after filters.

Relieving regulators exhaust when the downstream pressure exceeds the set pressure.

Nonrelieving regulators do not exhaust excess downstream pressure.

BSPP threads are also known as G threads.

Pressure gauges are for use with regulators with NPT threading.

Mounting brackets (sold separately) allow you to attach the regulator to a wall or equipment.

Regulators

Regulator

Mounting Bracket

Regulators
Pipe Size						Overall							Mounting Brackets
Inlet	Outlet	Max. Flow Rate	Max. Pressure, psi	Gauge Included	No. of Gauge Ports	Wd.	Ht.	Max. Temp., °F	Regulating Accuracy	Pressure Regulating Range, psi		Each		Each
Aluminum Housing—BSPP Female Inlet and Outlet
Relieving
1/4	1/4	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	00000000	0000000	000000	000000
3/8	3/8	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	00000000	000000	000000	00000
1/2	1/2	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	00000000	000000	000000	00000
Nonrelieving
1/4	1/4	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	00000000	000000	000000	00000
Aluminum Housing—NPT Female Inlet and Outlet
Relieving
1/4	1/4	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	000000	000000	000000	00000
3/8	3/8	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	000000	000000	000000	00000
1/2	1/2	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	000000	000000	000000	00000
1/2	1/2	225 scfm @ 100 psi	250	No	2	4"	7 5/8"	200°	±0.1%	0-2	00000000	000000	00000000	00000
Nonrelieving
1/4	1/4	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	00000000	000000	000000	00000
1/2	1/2	80 scfm @ 100 psi	250	No	2	3"	6 1/8"	160°	±0.05%	0-2	00000000	000000	000000	00000
3/4	3/4	250 scfm @ 100 psi	250	No	2	4"	7 5/8"	200°	±0.1%	0-2	00000000	000000	00000000	00000

Pressure Gauges

Pressure Gauge

Pressure Range, psi	Pipe Size	Connection Type	Thread Type	Gender	Connection Location		Each
0-15	1/4	Threaded	NPT	Male	Back	00000000	000000
0-30	1/4	Threaded	NPT	Male	Back	00000000	00000
0-60	1/4	Threaded	NPT	Male	Back	00000000	00000
0-160	1/4	Threaded	NPT	Male	Back	00000000	00000