Dwyer HHT Hazardous Area Humidity-Temperature Transmitter

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Humidity or humidity/temperature transmitter with 4-20 mA output for use in hazardous areas. 15-second response time. Optional integral two-line LCD display. NEMA 4X/IP66 rated aluminum enclosure. Available with FM intrinsically safe or explosion-proof rated enclosures.

Typically used in process monitoring, offshore HVAC monitoring, or dust and grain handling applications, the Dwyer HHT hazardous area humidity/temperature transmitter produces accurate measurements and fast response.

  • Capacitance polymer relative humidity sensor measures 0 to 100% RH with accuracy ±2% 10 to 90% RH and drift <1% RH/year, ±1% hysteresis, ±0.1% repeatability typical

  • Solid state band gap temperature sensor measures -40° to 140° F with an accuracy ±0.9° F at 72° F

  • 4-20 mA output signal; 2 channels for humidity/temperature models

  • 15 second response time

  • Optional two-line alphanumeric, 8 characters/line. Display resolution: 0.1% RH, 0.1°F (0.1°C) temperature. Temperature display is °F/°C selectable.

  • 1/2" NPTF conduit process connection, screw terminal block electrical connections

  • NEMA 4X/IP66 rated aluminum enclosure

  • 9.5-28 VDC power required for intrinsically safe models, 16.5-28 VDC required for explosion-proof models

  • Transmitter is not position-sensitive: Can be mounted horizontally or vertically

  • FM instrinsically safe: Class I, Div 1, Group A-D; Class II, Div 1 Group E-G; Class III Div 1, T4; FM explosion-proof: Class I, Div 1, Group A-D; Class II, Div 1 Group E-G; Class III Div 1; CE approved

More Information
Measuring Range 0 to 100% RH, -40° to 140° F

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