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Hazardous Area Humidity/Temperature Transmitter

Series HHT

The Series 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.

  • 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)
  • Hysteresis: ±1%
  • Repeatability: ±0.1% typical
  • Temperature Limits: -40 to 140°F (-40 to 60°C)
  • Storage Temperature: -40 to 176°F (-40 to 80°C)
  • Compensated Temperature: -40 to 140°F (-40 to 60°C)
  • Power Requirements: For instrinsically safe models HHT-IX, 9.5 to 28 VDC. For explosion-proof models HHT-EX, 16.5 to 28 VDC
  • Output Signal: 4-20 mA, 2 channels for humidity/temperature models (loop power on RH)
  • Response Time: 15 seconds
  • Electrical Connections: Screw terminal block
  • Conduit Connection: 1/2" female NPT
  • Drift: <1% RH/year
  • RH Sensor: Capacitance polymer
  • Temperature Sensor: Solid state band gap
  • Housing Material: Aluminum
  • Display: Optional 2 line alpha numeric, 8 characters/line. Temperature display is °F/°C selectable
  • Display Resolution: RH: 0.1%: Temperature 0.1°F (0.1°C)
  • Weight: 2 lb 8 oz (1134 g)
  • Enclosure Rating: NEMA 4X (IP66). Models 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; Models HHT-IX: FM Instrinsically Safe, Class I Div. 1 Group A, B, C, D, Class II Div. 1 Group E, F, G, Class III Div. 1 T4
  • Agency Approvals: FM, CE

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