2 PSI Gauges | McMaster-Carr

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Differential Pressure Gauges

Differential Pressure Transmitters

Liquid-Level Gauges

Liquid-Level Transmitters

For Use With

System of Measurement

Minimum Pressure

Pipe Size

Display Type

Measures

Differential Pressure

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

Connects To

Graduations

Measurement Unit

Pounds per Square Inch

Material

Thread Type

Maximum Pressure Differential

Pressure Numeric Increments

0.5 psi

For Maximum Tank Depth

Case Material

Dial Type

Gender

RoHS

Scale Type

Dial Diameter

Minimum Temperature

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

2B230

EAR99

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

REACH

12 Products

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.

Glass-Filled Nylon Case with Anodized Aluminum Connections (Pounds per Square Inch)

Image of Product. Front orientation. Differential Pressure Gauges. Low-Pressure Differential Gauges with Color Indicator.

	Pressure Range, psi
	Green Band	Yellow Band	Red Band	Max. Pressure, psi	Environment Temp. Range, ° F	Process Temp. Range, ° F	Ht.	Wd.	Dp.	Case Color	For Use With	Accuracy		Each
1/4 NPT Female Threaded Pipe Connection



		0 to 2	2 to 2.5	2.5 to 3.5	300	-40 to 200	-40 to 200	3 1/4"	3 1/4"	1 1/2"	Black	Air, Water, Hydraulic Fluid, Carbon Dioxide, Nitrogen, Hydrogen, Argon, Acetylene	±5%	2238K21	0000000

Precision Liquid-Level Gauges for Tanks

Style C

Using inches or centimeters instead of common levels, such as full or empty, these gauges are more precise than standard gauges when measuring liquid levels. While most gauges are designed for one tank depth, these have a float attached to a cable, so they work with any tank up to the maximum depth listed.

Style	For Max. Tank Dp., ft.	Graduations	Pipe Size	Thread Type	Gender	Overall Ht.	Float Lg.	Max. Pressure, psi	Temp. Range, ° F	For Use With	For Container Type	Float Material	Housing Material	Cable Material		Each
C	25	1/8", 1 ft.	1	NPT	Male	12 3/8"	13 13/16"	2	-40 to 140	Diesel Fuel, Gasoline, Hydraulic Fluid, Water	Closed Tank, Open Tank	304 Stainless Steel	Aluminum	304 Stainless Steel	6151T11	0000000

High-Accuracy Differential Pressure Transmitters

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.

For the Manufacturer User Manual, click on a part number and select Product Detail.

Aluminum Housing About Aluminum Housing

Image of Product. Front orientation. Contains Annotated. Differential Pressure Transmitters. High-Accuracy Differential Pressure Transmitters.

							Mounting Holes							Connection
	Pressure Differential, psi	Max. Input Pressure, psi	Input Voltage, V DC	Pipe Size	For No. of Wires	Mounting Hardware Included	Dia.	No. of	Ht.	Wd.	Enclosure Rating	For Use With	Accuracy	Pipe	Fitting	Material	Temp. Range, ° F		Each
4 to 20 mA Output Signal—Screw Terminals



		0 to 2	350	9 to 30	1/4	2	Yes	5/32"	4	3 1/8"	2 7/16"	NEMA 4	Air, Water	±0.25%	NPT Female	Threaded	17-4 PH Stainless Steel	0 to 175	9917K12	000000000

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 pounds per square inch.

Aluminum Case with Aluminum Connections—Single Scale (Pounds per Square Inch)

Image of Product. Front orientation. Differential Pressure Gauges. Medium-Pressure Differential Gauges.

	Max. Pressure, psi	Environment Temp. Range, ° F	Process Temp. Range, ° F	For Use With	Accuracy	Pressure, psi	Graduations, psi	Pressure Numeric Increments, psi		Each
1/4 NPT Female Threaded Pipe Connection



	2 1/2"	1,500	0 to 150	0 to 200	Water, Hydraulic Fluid, Gasoline, Natural Gas	±2%	0 to 2	0.1	0.5	4028K112	0000000


	4 1/2"	1,500	0 to 150	0 to 200	Water, Hydraulic Fluid, Gasoline, Natural Gas	±2%	0 to 2	0.1	0.5	4028K312	000000

316 Stainless Steel Case with 316 Stainless Steel Connections—Single Scale (Pounds per Square Inch)

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

	Max. Pressure, psi	Environment Temp. Range, ° F	Process Temp. Range, ° F	For Use With	Accuracy	Pressure, psi	Graduations, psi	Pressure Numeric Increments, psi		Each
1/4 NPT Female Threaded Pipe Connection



	2 1/2"	1,500	0 to 150	0 to 200	Water, Hydraulic Fluid, Gasoline, Natural Gas	±2%	0 to 2	0.1	0.5	4028K412	0000000


	4 1/2"	1,500	0 to 150	0 to 200	Water, Hydraulic Fluid, Gasoline, Natural Gas	±2%	0 to 2	0.1	0.5	4028K612	000000

Differential Pressure Transmitters with Dial Indicator for Air

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.

For the Manufacturer User Manual, click on a part number and select Product Detail.

Aluminum Housing About Aluminum Housing

Image of Product. Front orientation. Differential Pressure Transmitters. Differential Pressure Transmitters with Dial Indicator for Air.

												Connection
	Pressure Differential, in. H₂O	Max. Input Pressure, psi	Input Voltage, V DC	Pipe Size	For No. of Wires	Mounting Hardware Included	No. of Mounting Holes	Dia.	Certification	For Use With	Accuracy	Pipe	Fitting	Material	Temp. Range, ° F		Each
4 to 20 mA Output Signal—Screw Terminals



		0 to 2	2	10 to 35	1/8	2	No	3	5 1/2"	CE Marked	Air	±2%	NPT Female	Threaded	Aluminum	20 to 120	38525K213	0000000


		0 to 3	2	10 to 35	1/8	2	No	3	5 1/2"	CE Marked	Air	±2%	NPT Female	Threaded	Aluminum	20 to 120	38525K214	000000
		0 to 10	2	10 to 35	1/8	2	No	3	5 1/2"	CE Marked	Air	±2%	NPT Female	Threaded	Aluminum	20 to 120	38525K215	000000

Hazardous-Location Submersible Liquid-Level Transmitters


For Liquids	For Liquids with Solids

FM and C-FM approved, these transmitters safely measure liquid levels where explosive gas or dust may be present. Set them at the bottom of your tank in applications that make traditional mounting difficult. They sense liquid levels by measuring the pressure from the weight of the liquid above them. All continuously send measurements, so you can monitor status and manage components in your system. Also known as level loggers, level sensors, and pressure transducers.

For Liquids with Solids—Transmitters for liquids with solids have an unobstructed sensing element that resists clogging and sludge buildup in water with particulate and sewage.

				Overall
	For Pressure	Accuracy	Max. Pressure @ Temp.	Dia.	Lg.	Temp. Range, ° F	Cable Lg., ft.	Input Voltage, V DC	For Container Type	Electrical Connection	Hazardous Location Rating	Enclosure Rating		Each
4 mA to 20 mA Output Signal







				For Liquids

				0 to 2 psi / 0 to 5 ft. H₂O	±0.25%	20 psi @ 70° F	1"	6 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	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	NEMA 6P	3450K53	0000000




						For Liquids with Solids

						0 to 2 psi / 0 to 5 ft. H₂O	±0.25%	20 psi @ 70° F	1"	5 3/4"	-10 to 175	40	10 to 35	Open Tank	Wire Leads	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	NEMA 6P	3450K33	00000000