Dwyer HHT Humidity/Temperature Transmitter

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.

Features

• 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