Jiangsu Acrel Electrical Manufacturing Co., LTD.
Jiangsu Acrel Electrical Manufacturing Co., LTD.
  • whd20r 22 temperature humidity controller
  • whd20r 22 temperature humidity controller

Acrel WHD20R-22 Temperature & Humidity Controller

WHD series smart temperature and humidity controller is suitable for adjustment and control of temperature and humidity in equipments of high voltage switchgear, terminal box, ring network panel, box transformer substation etc. It can effectively protect relevant equipment from faults resulting from excessive low or high temperature, creepage or flashover etc.from humidity or condensation.

Video of Temp Humidity Controller

Technical Datasheet of WHD20R-22 Temperature & Humidity Controller

Technical ParameterValue
Measuring RangeTemperature-40.0℃~99.9℃
Transmitting OutputDC 4-20mA or DC 0~20mA
Set range of controlling parameterHeating for Temperature rising-40.0℃~40.0℃
Blowing for temperature decreasing0.0℃~99.9℃
Humidity control20%RH~90%RH
Output Contact Capacity5A/AC250V
Start/stop gap5
Communication portRS485,MODBUS(RTU) treaty
Auxiliary PowerVoltageAC/DC 85-265V
ConsumptionBasic power consumption(≤0.8w)+relay power consumption(each channel≤0.7w)
Insulation Resistanced≥100MΩ
Power-frequency withstand voltagepower with shell,touchable metal parts/power with other terminal group 2kV/1 min(AC.RMS)
Average work time without stoppage≥50000 hours
Working condition(controller)Temperature-20℃~+60℃
Humidity≤95%RH,without condensation and corrosive gas

Benefits of WHD20R-22 Temperature & Humidity Controller

  • Optional functions: alarm, communication
  • Temperature and humidity measuring & controlling
  • DIN rail mounted

Function of WHD20R-22 Temperature & Humidity Controller


Temperature ±1℃

Humidity ±5%RH


Auxiliary power supply

Basic power consumption(≤0.8w)

Relay power consumption(each channel≤0.7w)


DIN rail 35mm



Auxiliary power supply

AC 85-265V, DC 100-350V

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    No.5 Dongmeng Road, Nanzha Street, Jiangyin City, Jiangsu Province, China.