RH/RHT (Relative Humidity and Temperature) Industrial Enclosures

RH/RHT (Relative Humidity/Relative Humidity & Temperature) Transmitters

The RH/RHT industrial enclosures are robust relative humidity and temperature transmitters are suitable for wall outside air and duct mount applications.

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RH/RHT Transmitter Specifications


  • Space, Duct, and Outside Air Configurations
  • Durable Industrial Enclosures
  • Low Profile
  • Compact
  • Replaceable, Plug-in Bulk Polymer Resistance RH Sensor
  • Resistant to Contamination
  • Temperature Compensation




Sensing Element Resistance change of bulk polymer sensor


Accuracy at 77°F (25°C) ±2% RH, 20-95% RH
±3% RH,, 20-95% RH
±5% RH, 20 -95% RH
including hysteresis, linearity and repeatability
Mechanical: Case Material Space: ABS Flame Retardant
Duct: Galvanized Steel
Outside Air: Pressure Cast Aluminum and Galvanized Steel
Mounting Configurations Space, Duct, Outside Air
Temperature Effect Less than 0.06% per °F (0.11% per °C)
Sensitivity 0.1% RH
Repeatability 0.5% RH
Linearity See Accuracy
Hysteresis Less than 1%
Sensor Interchangeability ±3% nominal
Operating Range RH Sensor: 0%-99%, RH, non·condensing.
-40°F to +170°F (-40°C to +76°C)
Electronics: 0%-95% RH, non.condensing.
-40°F to +130°F (-40°C to +54°C)
Max. Air Velocity 10,000 ft/min
Output Range 2·wire. isolated loop, powered 4-20 mA, 0-100% RH (standard)
Adjustment Zero: ±20%. non·interactive
Span: ±10%, non·interactive
Long Term Stability: Less than 1 % drift/year typical
Storage -20 to 70°C (-4 to 158°F)
Storage Temperature -85°F to +158°F (-65°C to +70°C)


Accuracy at 77°F (25”C) ±0.5°F (±0.3°C)
Temperature Effect Less than 0.01% per °F (0.02% per°C)
Sensitivity 0.1% RH
Repeatability 0.1% RH
Linearity Better than 0.1 %
Hysteresis Less than 0.01%
Sensor Interchangeability ±0.5°F (±0.03°C)
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