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HHT Series

Explosion-proof humidity transmitter.

$1,649.00

Item# HHT-EU

In stock

Lead Time (If not in stock): 3 weeks
Explosion-proof humidity transmitter. HHT-EU HHT-EU

Dwyer Instruments is now a DwyerOmega brand. We're working together to bring you the best products in a single shopping experience.

  • FM approved explosion-proof and intrinsically safe models
  • Integral LCD option
  • Dual temperature and relative humidity output models
  • Process monitoring
  • Offshore HVAC monitoring
  • Dust and grain handling

HHT-EU Model Options

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Input Type
Display Type
Input Ranges
Output Type
Supply Voltage Type
Additional Feature


  • Accuracy: ±2% 10 to 90% RH, ±0.9°F at 72°F (±0.3°C at 25°C).
  • Compensated Temperature: -40 to 140°F (-40 to 60°C).
  • Compliance: FM, CE.
  • Conduit Connection: 1/2" female NPT.
  • 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).
  • Drift: <1% RH/year.
  • Electrical Connections: Screw terminal block.
  • 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.
  • Housing Material: Aluminum.
  • Hysteresis: ±1%.
  • Output Signal: 4 to 20 mA, 2 channels for humidity/temperature models (loop power on RH).
  • Power Requirements: For instrinsically safe models HHT-IX, 9.5 to 28 VDC. For explosion-proof models HHT-EX, 16.5 to 28 VDC.
  • RH Sensor: Capacitance polymer.
  • Relative Humidity Range: 0 to 100% RH.
  • Repeatability: ±0.1% typical.
  • Response Time: 15 s.
  • Storage Temperature: -40 to 176°F (-40 to 80°C).
  • Temperature Limits: -40 to 140°F (-40 to 60°C).
  • Temperature Range: -40 to 140°F (-40 to 60°C).
  • Temperature Sensor: Solid state band gap.
  • Weight: 2 lb 8 oz (1134 g).

Dwyer Instruments is now a DwyerOmega product brand.


The Series HHT Hazardous Area Humidity/Temperature Transmitter takes accurate measurements in the harshest of environments. 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, and do require an intrinsically safe barrier to meet hazardous area approvals

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