Mbar Pressure Gauges | McMaster-Carr

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35 Products

About Pipe Size

About Pressure Gauges

About Pressure Transmitters

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Check the vacuum levels in high-vacuum pumps, valves, and chambers with this compact gauge. Use a ring and clamp (both sold separately) to connect them to another quick-clamp high-vacuum fitting, also known as KF, QF, and NW fittings. The digital display shows measurements in torr, mbar (millibar) and hPa (hectopascal).

ABS Plastic Case with 304 Stainless Steel Connection—(Torr, mbar, hPa)

For Use With: Air
Accuracy: ±10% @ 7.5 to 7.5 × 10 ^-3 torr, ±30% @ 75 to 7.5 torr

Vacuum Range
Torr	mbar	hPa
750 to 7.5 × 10 ^-5	1000 to 5 × 10 ^-4	1000 to 5 × 10 ^-4

Gauges with Center Back Connection											Clamps		Rings
High-Vacuum Flange Size	Wd.	Ht.	Dp.	Environment Temp. Range, °F	Process Temp. Range, °F	For Tube OD	Flange OD	Number of Batteries Included		Each		Each		Each
Quick Clamp Tube Connection
16	2 3/8"	4 3/4"	1"	40° to 100°	0° to 140° F	3/4"	1.18"	1	000000	000000000	00000000	00000	00000000	00000

Absolute Pressure Gauges

Bottom Connection

Unlike other gauges that measure the difference between your system and the atmosphere, these give measurements relative to zero pressure. They’re often used in laboratory applications, and they are barometrically independent.

Gauges with a Torr scale are also known as Torr gauges.

Stainless steel gauges have excellent corrosion resistance, so they can be used with more corrosive liquids and gasses than gauges with a brass connection and aluminum case.

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

Anodized Aluminum Case with Brass Connection—Dual Scale (mbar, Torr)

For Use With: Air
Accuracy: ±2% Full Scale (Not Graded)

Available Pressure Ranges
		Numeric Increments		Graduation Marks
Pressure Range, mbar	Pressure Range, Torr	mbar	Torr	mbar	Torr
0 to 25	0 to 20	5	2	0.5	0.2
0 to 50	0 to 40	10	10	1	1
0 to 130	0 to 100	20	20	2	2
0 to 1,000	0 to 760	200	100	20	10

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Lens Material		Each
NPT Male
4"	1/4	5° to 120°	0° to 145°	Glass	000000	0000000

Stainless Steel Case with Stainless Steel Connection—Single Scale (mbar)

For Use With: Air, Carbon Dioxide, Diesel Fuel, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Natural Gas, Water
Accuracy: ±1% Full Scale (Not Graded)

Available Pressure Ranges
Pressure Range, mbar	Numeric Increments, mbar	Graduation Marks, mbar
0 to 25	5	0.5
0 to 60	10	1
0 to 160	50	5
0 to 600	100	10
0 to 1,000	200	20

					Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Lens Material		Each
BSPP Male
4"	1/2	5° to 120°	0° to 200°	Glass	000000	000000000

Differential Pressure and Vacuum Gauges with Digital Display

Gauges have a four-digit LCD display for easy reading of measurements. Commonly used to indicate clogged filters, these gauges display the difference between two pressure or vacuum measurements. They are also known as compound gauges.

Aluminum Case with Brass Connection—(psi, kPa, in. of H₂O, in. of Hg, mbar)

For Use With: Air
Accuracy: ±0.5% Full Scale (Not Graded)

Pressure Range
psi	kPa	in. of H₂O	mbar	Vacuum Range, in. of Hg	Resolution, in. of H₂O	Max. Pressure, psi	For Tube ID	Environment Temp. Range, °F	Process Temp. Range, °F	Digit Ht.	Batteries Included	Features		Each
Barbed Tube Connection
0-0.723	0-4.982	0-20"	0-49.82	1.471"-0	0.01	10	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	0000000
0-7.225	0-49.82	0-200"	0-498.2	14.71"-0	0.1	30	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
0-20	0-137.9	0-553"	0-1,379	40.72"-0	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
Barbed Tube Connection with Calibration Certificate Traceable to NIST
0-0.723	0-4.982	0-20"	0-49.82	1.471"-0	0.01	10	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
0-7.225	0-49.82	0-200"	0-498.2	14.71"-0	0.1	30	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000
0-20	0-137.9	0-553"	0-1,379	40.72"-0	0.01	60	1/8"-3/16"	35° to 100°	0° to 140°	3/8"	Yes	40-Reading Memory, Overpressure Alarm	0000000	000000

Pressure Transmitters with Digital Display

For Use With: Air, Argon, Hydraulic Fluid, Nitrogen, Water
Accuracy: ±0.5%
Pipe Connection: NPT Male
Housing Material: 304 Stainless Steel
Connection Material: 304 Stainless Steel
Temperature Range: -40° to 185° F

Read pressure directly at the source and send data remotely with one device. Also known as transducers, these transmitters convert 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. As pressure increases, the output signal from the transmitter will increase. 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. Transmitters will only provide accurate readings within the rated pressure range.

To change settings and receive error messages remotely from your PLC or computer, program one of the outputs to use IO Link. You need an IO-Link controller (not included) to connect to your interface.

All have an M12 plug to connect to M12 sockets. When using the analog current output they require 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. These transmitters can also connect using three wires to send an analog voltage output—two wires into the power supply and a separate wire that sends a signal to the receiver. The receiver and the transmitter share a common ground wire back to the power supply. View switch wiring diagrams by selecting a part number and clicking Product Detail.

All transmitters are rated IP67 for protection from temporary submersion. UL and C-UL listed as well as CE marked, they meet strict American, Canadian, and European safety standards.

								Configurable Analog Transmitter/Digital Switch Output				Configurable Digital Switch Output
Pressure Range, psi	Maximum Continuous Pressure, psi	Maximum Short-Term Pressure, psi	Setpoint Range, psi	Input Voltage	Pipe Size	Ht.	Wd.	No. of	Current	Voltage	Signal Type	No. of	Signal Type	Environmental Rating		Each
4-Pole Micro M12 Plug Connection
0-29	29	55	0-29	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	0000000
0-73	73	145	0-73	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-145	145	290	0-145	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-290	290	580	0-290	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-725	725	1,450	0-725	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-1,450	1,450	2,900	0-1,450	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-3,625	3,625	5,800	0-3,625	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-5,800	5,800	9,425	0-5,800	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000
0-8,700	8,700	14,500	0-8,700	18-30V DC	1/4	3 3/4"	1 11/32"	1	4-20mA	0-10V DC	NPN, PNP	1	NPN, PNP	IP67	00000000	000000

Pressure and Vacuum Transmitters with Digital Display

For Use With: Air, Argon, Diesel Fuel, Hydraulic Fluid, Nitrogen, Water
Accuracy: ±1%
Pipe Connection Type: Threaded
Housing Material: Glass-Reinforced Polyester
Connection Material: 316L Stainless Steel
Temperature Range: -10° to 175°F

Monitor and control vacuum pumps, air compressors, and hydraulics while viewing readings and warnings on the display. These transmitters, also called transducers, have two outputs, so you can program them to work as a transmitter, a switch, or both. When they reach their setpoint, they send electrical signals to your programmable logic controller (PLC) to trigger actions in your system. Adjust their reset point anywhere within the setpoint range. To change settings and receive error messages remotely from your PLC or computer, program one of the outputs to use IO Link. You need an IO-Link controller (not included) to connect to your interface.

Buttons on the display let you change your setpoint, measuring range, and other settings. To quickly tell the status of your process, you can program the color of the display to red and green. LEDs on the corners also notify you of your output’s switching status. Rotate the head to view the display from the best angle.

You must calibrate your PLC in order for it to interpret signals from these transmitters. As pressure increases, the output signal from the transmitter will increase. These transmitters only give accurate readings within the rated pressure or vacuum range.

All have an M12 plug to connect to M12 Connectors. When using both switching outputs and an IO-Link controller, they require four wires to connect. For their 4-20mA analog output, they need two wires to connect. View switch wiring diagrams by selecting a part number and clicking Product Detail.

To withstand wet environments, these transmitters have a 316L stainless steel connection and are IP rated. Their IP ratings also mean they’re dust tight and stand up to spraying water and brief submersion. UL and C-UL listed as well as CE marked, they meet strict American, Canadian, and European safety standards.