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Low Differential Pressure Transmitter AI178A
Pressure Medium: Air/Gas
Sensor Type: Differential
Supply Voltage: 5V
Output Signal: 4-20 mA
Pressure Range: Under 4” H2O
Kind: Packaged Transducer

Model 178A Series are low-range differential pressure transmitters. Each unit features a 3 1/2 digit LCD to show the pressure, also a push button switch (inside) for zero pressure calibration. 

The AI178A Series has a SS304 front panel and an IP65/NEMA 4 rated aluminum die casting enclosure, good for many indoor and outdoor applications. The pressure ranges from 0.1" WC to 100" WC, uni-directional or bi-directional. The output is 2-wire 4-20 mA, fully protected against short circuiting and incorrect wiring. All units are temperature-compensated with available accuracies of 0.8%, 0.4% and 0.25% FS. The patented stainless steel diaphragm sensor provides good corrosion resistance, excellent repeatability and long term stability.


  • 3 1/2 digit LDC display
  • Up to 15 PSI overpressure
  • Incorrect wiring protection
  • Rugged aluminum housing rated NEMA 4/IP65
  • RoHS Compliance
  • Pressure ranges as low as 0 - 0.1"WC
  • Temperature-compensated
  • Uni-directonal or bi-directional

Typical Uses

  • HVAC air pressure and VAV pressure sensor
  • Cleanroom pressure and fume hood airflow control
  • Duct static pressure measurement
  • Draft control
  • Furnace airflow control
  • Isolation rooms