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One- or two-pipe, direct-acting humidity sensor used with RP908/RP920 Controllers to provide proportional control of pneumatic valve or damper actuators in systems requiring humidification or dehumidification control.


  • Corrosion resistant materials.
  • Simple plug-in air head connections.
  • Factory calibrated.
  • Continuous relative humidity indication available by using receiver gage.
  • Integral or external restriction can be used.

Product Specifications

Humidity Sensor
Airflow Usage
0.022 scfm (10.4 mL/s)
Push-on barb for 5/32 in. (4 mm) O.D. tubing
Dimensions (in.)
3 1/4 in. high x 2 in. wide x 1 5/8 in. deep
Dimensions (mm)
88 mm high x 51 mm wide x 41 mm deep
Maximum Safe Operating Pressure (psi)
25 psi
Maximum Safe Operating Pressure (kPa)
172 kPa
Order Cover Separately
Vertical or Horizontal Wall Mounting or Mounted in Duct Sampling Chamber
Operating Temperature Range (F)
125 F Maximum
Operating Temperature Range (C)
52 C Maximum
Pressure Ratings (psi)
Output--3 psi to 15 psi; Supply--16 to 21 psi
Pressure Ratings (kPa)
Output--21 kPa to 103 kPa; Supply--110-145 kPa
Direct Acting
Number of Pipes
1 or 2
Sensor Range
15 to 85% RH
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