3 psi Pressure Gauges | McMaster-Carr

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For Use With

Maximum Environment Temperature

140° F

185° F

200° F

Measures

Differential Pressure

Pipe Size

Measurement Unit

Pounds per Square Inch

Mounting Position

Upright

Thread Type

NPT

Maximum Process Temperature

Case Material

System of Measurement

Inch

Maximum Pressure

Less than 1,000 psi

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

Pressure Numeric Increments

Connects To

Connection Location

Minimum Environment Temperature

Accuracy Grade

Fitting Connection

Dial Diameter

Connection Material

Minimum Pressure

Minimum Process Temperature

REACH

RoHS

Scale Type

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

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27 Products

About Pipe Size

About Pressure Gauges

Single Scale With Bottom Connection

Single Scale With Center Back Connection

Bottom Connection

Center Back Connection

Measure small pressure changes in ventilation systems, hydraulic applications, and other critical processes with these high-accuracy gauges. Mount them with the dial face upright.

Gauges with 304 stainless steel case or polyester plastic case have better corrosion resistance than gauges with steel case.

Painted Steel Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1.5% Full Scale (Not Graded)

Available Pressure Gauges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 3	0.05	0.5

						Bottom Connection		Center Back Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Mounting Orientation		Each		Each
NPT Male
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000
NPT Male with Calibration Certificate Traceable to NIST
2 1/2"	1/4	0° to 140°	0° to 140°	Black	Upright	0000000	000000	0000000	000000

304 Stainless Steel Case with Brass Connection—Single Scale (psi)

For Use With: Air, Water, Hydraulic Fluid, Carbon Dioxide, and Natural Gas
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Gauges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 3	0.05	0.5

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Mounting Orientation		Each
NPT Male
4"	1/4	0° to 140°	0° to 140°	Upright	000000	0000000

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	0-3	3-4.5	4.5-5	300	-40° to 200°	-40° to 200°	3 1/4"	3 1/4"	1 1/2"	Black	0000000	0000000

High-Accuracy Digital Test Gauges for Pressure

Battery Powered

AC/DC and DC Powered

Bottom Connection

Not only do these gauges have an accuracy of ±0.25%, they also have a four-digit LCD display that allows for easy reading of measurements. Use them for testing, calibrating, laboratory applications, and other critical applications that require precision.

Gauges with 4-20mA current output convert pressure to an electrical signal for remote monitoring.

Aluminum Case with 316 Stainless Steel Connection—Battery Powered

For Use With: See Table
Accuracy: ±0.25% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range
psi	bar	MPa	Resolution, psi
0 to 3	0 to 1	0 to 1.4	0.01

Dial										Bottom Connection
Ht.	Wd.	Pipe Size	Environment Temperature Range, °F	Process Temperature Range, °F	Environment	For Use With	Features	Digit Ht.	Batteries Included		Each
NPT Male
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	__	Air, Hydraulic Fluid, Water	5-min. Automatic Shut-Off	1/2"	Yes	0000000	0000000
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	Hazardous Location	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	5-min. Automatic Shut-Off	1/2"	Yes	0000000	000000
NPT Male—Calibration Certificate Traceable to NIST
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	__	Air, Hydraulic Fluid, Water	5-min. Automatic Shut-Off	1/2"	Yes	0000000	000000
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	Hazardous Location	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Water	5-min. Automatic Shut-Off	1/2"	Yes	0000000	000000

Aluminum Case with 316 Stainless Steel Connection—AC/DC Powered

For Use With: See Table
Accuracy: ±0.25% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range
psi	bar	MPa	Resolution, psi
0 to 3	0 to 1	0 to 1.4	0.01

Dial									Bottom Connection
Ht.	Wd.	Pipe Size	Environment Temperature Range, °F	Process Temperature Range, °F	For Use With	Digit Ht.	Wire Connection Type	Input Voltage		Each
NPT Male
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	Air, Hydraulic Fluid, Water	1/2"	Wire Leads	8-24V AC, 9-32V DC	0000000	0000000
NPT Male—Calibration Certificate Traceable to NIST
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	Air, Hydraulic Fluid, Water	1/2"	Wire Leads	8-24V AC, 9-32V DC	0000000	000000

Powder-Coated Aluminum Case with 316 Stainless Steel Connection—DC Powered with 4-20mA Output Current

For Use With: See Table
Accuracy: ±0.25% Full Scale (Not Graded)
Environmental Rating: 0 to 1,000 psi: NEMA 2, All other psi ranges: NEMA 4X

Available Pressure Ranges
Pressure Range, psi	Resolution, psi
0 to 3	0.01

Dial									Bottom Connection
Ht.	Wd.	Pipe Size	Environment Temperature Range, °F	Process Temperature Range, °F	For Use With	Digit Ht.	Wire Connection Type	Input Voltage		Each
NPT Male
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	Air, Hydraulic Fluid, Water	1/2"	Wire Leads	8-32V DC	0000000	0000000
NPT Male—Calibration Certificate Traceable to NIST
2 7/8"	3 3/8"	1/4	0° to 185°	-40° to 200°	Air, Hydraulic Fluid, Water	1/2"	Wire Leads	8-32V DC	0000000	000000

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About Pipe Size

About Pressure Gauges

High-Accuracy Low-Pressure Gauges

Low-Pressure Differential Gauges with Color Indicator

High-Accuracy Digital Test Gauges for Pressure