122 Series Pressure Switches and Transmitters

122 Series Mechanical Pressure Switches & Transmitters

Versatile, local or remote indication of system pressure for high-purity applications.

Models IPS122 / IPT122

The Brooks Instrument 122 Series mechanical pressure gauges were designed and developed for the demanding high-purity applications of the semiconductor industry. Made of stainless steel, our mechanical pressure gauges feature an accuracy of 1% of full scale. These two inch gauges are durable measuring devices that come in a variety of process connections, pressure ranges, and socket orientations, offering a reliable and efficient way to monitor pressure locally. Get precise, high-performance results from the world’s leading pressure gauge supplier.


  • Indicating Pressure Switches Model IPS122 2″
    • 2-inch stainless steel solid-state switch with local and remote alarm capability
    • Electronic switch with an adjustable pressure switch set point to operate lights or relays up to 12 watts
    • Logic outputs: Off-on and Type 1 (0 to 9-30 Vdc), Type 2 (8 to 30 Vdc) and Type 3 (0 to 5 Vdc)
    • Available in a variety of process connections, pressure ranges and socket orientations

    Indicating Pressure Transmitters Model IPS122 2″

    • 2-inch stainless steel transmitter
    • Pressure ranges: Up to 4000 psi
    • Accuracy: 1% of full scale
    • Industry standard output: 4 to 20 mA, 0 to 5 Vdc, 1 to 5 Vdc
  • 316L stainless steel construction withstands harsh environments
  • Available in a variety of process connections, pressure ranges and socket orientations to fit application needs
  • Powered models support electric standard outputs for convenient connection
  • Gas delivery systems and tools used for semiconductor processing, including:
    • Bulk gas
    • Gas cabinets
    • Gas distribution
    • Solar panels
    • Processes: Food and beverage, pharmaceutical, water treatment and bulk gas

Product Type

Mechanical Pressure Switches
Mechanical Pressure Transmitters


Ultra-High Purity
High Accuracy


Pressure Range

Vacuum to 4,000 psi (276 bar) & metric


1% Full Scale

Response Time

Less than 200 milliseconds


Helium Leak Check

4 x 10-9 inboard std. cc/sec


Cleaned for oxygen service to ANSI B40.1 level IV specifications

Temperature Range

0° to 160°F (-18° to 71°C)

Temperature – Compensating

20° to 135°F (-7 to 57°C)

Temperature – Storage

-20° to 175°F (-29° to 79°C)



300 Series Stainless Steel, electropolished

Input / Output



Off-On Switch Type 1: 9 to 30 Vdc
Logic Output 8 to 30 Vdc Type 2: 9 to 30 Vdc
Logic Output 5 Vdc Type 3: 4.8 to 5.2 Vdc


Off-On Switch Type 1: 0 to 9-30 Vdc; 30 mA (off), 45 mA (on)
Logic Output 8 to 30 Vdc Type 2:  0 to 9-30 Vdc; 30 mA (off), 45 mA (on)
Logic Output 5 Vdc Type 3: 0 to 5 Vdc; 3 mA (off), 11 mA (on) 
Switch Leads: 2 m (6’) cable, tinned ends, 0.23” in diameter
Switch Differential: 3% of scale: 0.25% of scale repeatability
Trip Position: External adjust. Select to trip on ascending (N.O.) or descending (N.C.) pressure. (Field changeable by internal jumper.)



Voltage In: 11.5 to 30 Vdc (12 Vdc recommended)
Voltage Stability: Filtered power supply with noise <2mV RMS, ripple < 6 mV P-P
Operating Current: 40 mA maximum short circuit to ground, 8 mA continuous load, 10 mA maximum intermittent


Type 1: 0 to 5 Vdc
Type 2: 1 to 5 Vdc
Type 3: 1 to 5 Vdc ground referenced
Type 4: 4 to 20 mA sinking
Type 5: 0-5 Vdc or 1-5 Vdc, or 4-20 mA current sink
Type 6: 1-5 Vdc ground reference, 4-20 mA sinking
Type 8: 4-20 mA sourcing, 3-pin Molex connector with 10’ cable
Type 9: 4-20 mA sourcing, 6’ cab/w with tinned ends
Output Current: 40 mA max. short circuit to ground, 10 mA continuous load
Transmitter Leads: 2 m (6’) cable, tinned ends, 0.23” in diameter

Power Requirements

Off-On Switch Type 1
12 Watts or 500 mA; 175 mA max. for intrinsically safe applications

Logic Output 8 to 30Vdc Type 2
60 mA (sink) Open collector NPN

Logic Output 5 Vdc Type 3
60 mA (sink) Open collector NPN



White with black marking; “Use No Oil” is red.

Process Connections

Face-seal male, face-seal swivel male, face-seal swivel female and 1/4” NPT male

Burst Pressure


Proof Pressure


Bourdon Tube

316L Stainless Steel


300 Series Stainless Steel

Socket Material

316L Stainless Steel

Bezel & Lens Material

One-piece polycarbonate, screw-on

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