How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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About Pipe Size
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About Pressure Gauges
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About Pressure Transmitters
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Hand-Held High-Vacuum Gauges
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).
- For Use With: Air
- Accuracy: ±10% @ 7.5 to 1.5 × 10 -4 torr, ±30% @ 75 to 22.5 torr
Vacuum Range | ||
|---|---|---|
| Torr | mbar | hPa |
| 750 to 3.7 × 10 -4 | 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 |
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.
- 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 |
Absolute Pressure Gauges
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.
- 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 |
- 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 |
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.
For technical drawings and 3-D models, click on a part number.
Setpoint Range | Configurable Analog Transmitter/Digital Switch Output | Configurable Digital Switch Output | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pressure Range, psi | Vacuum Range, in. of Hg | Max. Continuous and Short-Term Pressure, psi | Pressure, psi | Vacuum, in. of Hg | Input Voltage | Pipe Size | Ht. | Wd. | No. of | Current | Signal Type | No. of | Signal Type | Scale | Each | |
NPT Female | ||||||||||||||||
| 0-14.5 | 29.5-0 | 145 | 0-14.5 | 29.5-0 | 18-30V DC | 1/4 | 3 9/16" | 1 3/8" | 1 | 4-20mA | NPN, PNP | 1 | NPN, PNP | in. of H2O, in. of Hg, kPa, mbar, psi | 0000000 | 0000000 |
NPT Male | ||||||||||||||||
| 0-14.5 | 29.5-0 | 145 | 0-14.5 | 29.5-0 | 18-30V DC | 1/4 | 3 9/16" | 1 3/8" | 1 | 4-20mA | NPN, PNP | 1 | NPN, PNP | in. of H2O, in. of Hg, kPa, mbar, psi | 0000000 | 000000 |
BSPP Female | ||||||||||||||||
| 0-7.3 | 14.8-0 | 145 | 0-7.3 | 14.8-0 | 18-30V DC | 1/4 | 3 9/16" | 1 3/8" | 1 | 4-20mA | NPN, PNP | 1 | NPN, PNP | in. of H2O, kPa, mbar, psi | 0000000 | 000000 |
| 0-14.5 | 1.4-0 | 145 | 0-14.5 | 1.4-0 | 18-30V DC | 1/4 | 3 9/16" | 1 3/8" | 1 | 4-20mA | NPN, PNP | 1 | NPN, PNP | in. of H2O, kPa, mbar, psi | 0000000 | 000000 |
| 0-14.5 | 29.5-0 | 145 | 0-14.5 | 29.5-0 | 18-30V DC | 1/4 | 3 9/16" | 1 3/8" | 1 | 4-20mA | NPN, PNP | 1 | NPN, PNP | in. of H2O, in. of Hg, kPa, mbar, psi | 0000000 | 000000 |
BSPP Male | ||||||||||||||||
| 0-14.5 | 29.5-0 | 145 | 0-14.5 | 29.5-0 | 18-30V DC | 1/4 | 3 11/16" | 1 3/8" | 1 | 4-20mA | NPN, PNP | 1 | NPN, PNP | in. of H2O, in. of Hg, kPa, mbar, psi | 0000000 | 000000 |
Barometers
Measure atmospheric pressure changes in both inches of mercury (Hg) and millibars (mbar).
Barometric Pressure | Overall | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Range | Accuracy | Graduation Marks | Digit Ht. | Dia. | Ht. | Wd. | Dp. | Mounting Location | Batteries Included | Mounting Hole Dia. (No. of) | Fasteners Included | Certification | Each | |
Dial Display | ||||||||||||||
| 28.1 to 31.7 in. of Hg 715 to 805 mmHg 954 to 1,073 mbar | ±0.05 in. of Hg ±0.05 mmHg ±0.05 mbar | 0.05 in. of Hg 1 mmHg 0.5 mbar | __ | 4" | __ | __ | 1 1/4" | Freestanding, Wall | __ | 3/8" (1) | No | Calibration Certificate Traceable to NIST | 00000000 | 0000000 |
LCD Display with Audible Alarm and Trend Indicator | ||||||||||||||
| 20 to 32 in. of Hg 509 to 812 mmHg 677 to 1,083 mbar | ±0.045 in. of Hg ±1.14 mmHg ±1.5 mbar | __ | 1 1/2" | __ | 2 7/8" | 9" | 1 1/2" | Freestanding, Wall | Yes | 1" (1) | No | __ | 000000 | 000000 |