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Electromechanical Hygrostat

The RFHSS Electromechanical Hygrostat is designed to control the relative humidity inside of electronic enclosures. When connected to an enclosure heater or dehumidifier, it will switch on the heater at the humidity set point in order to raise the dew point. This helps prevent damage and malfunction of electronic components and metal parts caused by condensation and corrosion.

The RFHSS series can also be used to control cooling fans, warning lights, or other devices and is equipped with a negative feedback contact, which could be used as a dry contact for centralized monitoring and controlling systems (PLC).​
  • 24 – 230V AC
  • Setting range: 40 – 90% RH
  • Easy mounting on a standard 35mm DIN rail (EN60715)
Electrical and electronic controls systems, Power distribution panels and transformer health, Telecommunication systems, Parking control systems, Dispensing and POI systems, Automated teller machines (ATM’s), Medical imaging, and Power generation including fossil, wind, water and solar, transportation infrastructure

Electronic Hygrostat EHT


  • Exterior setting: 5% RH increments
  • 2 color LED status indicator: operation mode/error status
  • Frost protection activation at 4°C degrees (default)
  • Unit can work in either NC (Humidifying) or NO mode (Dehumidifying)
Electrical controller for drying and providing frost protection for outdoor enclosures such as in wind turbine, ticket dispensers, parking gates, ATM's or similar applications.