Dwyer HHT Humidity/Temperature Transmitter
Starting at $685.00

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  • Relative Humidity Range: 0 to 100% RH
  • Temperature Range: -40 to 140°F (-40 to 60°C)
  • Accuracy: ±2% 10-90% RH, ±0.9°F at 72°F (±0.3°C at 25°C)
  • Repeatability: ±0.1% typical
  • Temperature compensated over entire range
  • 4-20 mA output, 2 channels for humidity/temperature models (loop power on RH)
  • Screw terminal block electrical connection
  • Conduit Connection: 1/2" female NPT
  • Capacitance polymer RH sensor
  • Solid state band gap temperature sensor
  • Aluminum housing
  • Optional 2 line alpha numeric display
  • CE, FM approved
  • NEMA 4X (IP66) rated enclosure
  • Approvals:
    • HHT-EX: FM Explosion-proof, Class I Div. 1 Group B, C, D, Class II Div. 1 Group E, F, G, Class III Div. 1
    • HHT-IX: FM Intrinsically Safe, Class I Div. 1 Group A, B, C, D, Class II Div. 1 Group E, F, G, Class III Div. 1 T4

The Dwyer HHT Hazardous Area Humidity/Temperature Transmitter takes accurate measurements in the harshest of environments. The transmitter is offered in explosion-proof and intrinsically-safe versions depending on the application's requirements. The explosion-proof model is offered with 4 to 20 mA output for humidity only. The intrinsically-safe version is offered with 4 to 20 mA output for humidity and temperature. Both versions have an optional two line alphanumeric display to show the current humidity and temperature.

The Series HHT humidity/temperature transmitter is excellent for offshore HVAC applications, dust and grain applications. Intrinsically safe models require an intrinsically safe barrier.

Dwyer A-287 Mounting Bracket
Mounting bracket for Dwyer TTE temperature transmitter
Dwyer Galvanic Barrier
Loop powered galvanic barrier for use with intrinsically safe transmitters


This product can be used in the following applications: