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Sensaphone Duct-Mount Humidity Transmitter


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WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov


Monitor Humidity in Ductwork with Sensaphone

Used with any Sensaphone model that accepts a 4-20mA signal, the Sensaphone FGD-0052-DUCT Duct-Mount Humidity Transmitter is a sensor that mounts directly into a return air duct to monitor the ductwork's humidity levels. It detects and transmits true humidity levels to the Sensaphone for high and low setpoint alarms. When the detected humidity level reaches your custom set threshold, an alarm is triggered.

  • Detects 0% to 100% relative humidity (RH) levels
  • Mounts directly into a return air duct to monitor ductwork
  • Works with Sensaphone models that accept a 4-20mA signal
  • Triggers alarm when humidity level reaches set threshold

The sensor detects the relative humidity level from 0 to 95 percent, accurate to ± 3 percent (as tested when humidity level ranges from 5 to 95 percent RH). The sensor's housing is IP65 NEMA 4X rated to keep out dust and other elements within your ductwork.

Installation Details

The Transmitter wires into your Sensaphone, as well as a 24VDC power supply (Sensaphone part # FGD-0070, sold separately) with 22AWG shielded wiring (part # FGD-0010, sold separately) for all connections.


  • Humidity Transmitter
  • Mounting Hardware
  • Installation Instructions

NOTE: For any Sensaphone that does not provide 24VDC output power, the Transmitter requires a 24VDC power supply, part # FGD-0070 (sold separately). Requires connection to a compatible Sensaphone system that accepts a 4-20mA signal, such as the Sensaphone Sentinel Monitoring System (sold separately). Does not come with wire or power supply.

IMPORTANT NOTE: This Sensaphone product is not available to ship outside the U.S.

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  • Manufacturer Part #: FGD-0052-DUCT
  • Sensor Series: 4-20mA Series
  • Connection: Hardwired
  • Power: Requires a 24VDC power supply (FGD-0070, not included)
  • Operating Temperature: -40° to 158°F (-40° to 70°C)
  • Humidity: 0 to 100 percent
  • Accuracy: ±3 percent RH (5 to 95 percent RH)
  • Housing: IP65 NEMA 4X
  • Dimensions: 4.5(W) x 3.3(H) x 2.1(D) inches (114 x 84 x 53mm)

Wiring Diagram