NEMA 4 Pressure Transmitter AI168
Pressure Medium: Air/Gas
Sensor Type: Differential
Supply Voltage: 5V
Output Signal: Voltage, 4-20 mA
Pressure Range: Under 4” H2O
Kind: Packaged Transducer

Model 168 Series are low range differential pressure transducers and transmitters with NEMA 4 (IP-65) rated aluminum enclosures. They are very rugged and reliable, good for many industrial applications. The pressure range covers from 0.1"WC to 100"WC, unidirectional or bi-directional.

All new inquiries for these parts should contact Alpha Instruments directly via their  Contact Us page or at This email address is being protected from spambots. You need JavaScript enabled to view it.. You may also contact us with any questions and we can forward your inquiry accordingly.

The output can be 3-wire 0-5V, 0-10V or 2-wire with a 4-20 mA output, fully protected against short circuits and incorrect wiring. In the voltage version, the output can go down to true zero. The units can be temperature-compensated. The accuracy can be 0.8%, 0.4% or 0.25% at room temperature. The patented stainless steel sensor provides good corrosion resistance, excellent performance and long-term stability. Our unique production setup can also make special pressure ranges (e.g. -0.5"WC to +3.5"WC) to meet special applications. 


  • NEMA 4 enclosure
  • Up to 15 PSI overpressure
  • Incorrect wiring protection
  • Asymmetrical bidirectional pressure ranges available
  • Temperature-compensated
  • Uni-directional or bi-directional
  • True zero output for voltage unit
  • Meets CE conformance standards
  • Meets RoHS requirements
  • Pressure ranges at low as 10 Pa

Typical Uses

  • HVAC and VAV control
  • Cleanroom and fume hood control
  • Duct static pressure measurement
  • Draft control
  • Furnace airflow control
  • Power plant airflow monitoring and control