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https://www.acrelenergy.com/products/whd20r-22-digital-temperature-humidity-controller/

The controller for temperature and humidity 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. These products meet the requirements of GB/T 15309-1994.

Technical Parameters of WHD20R-22 Digital Temperature and Humidity Controller
How to Wire a WHD20R-22 Digital Temperature & Humidity Controller
WHD20R-22 Digital Temperature & Humidity Controller Applications
Technical ParameterValue
Measuring RangeTemperature-40.0℃~99.9℃
Humidity0%RH~99%RH
PrecisionTemperature±1℃
Humidity±5%RH
Transmitting OutputDC 4-20mA or DC 0~20mA
Ser 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/stopgap5
Communication portRS485,MODBUS(RTU) treaty
Auxiliary PowerVoltageAC/DC 85-265V
ConsumptionBasic power consumption(≤0.8w)+relay power   consumption(each channel≤0.7w)
Insulation Resistance≥100MΩ
Power-frequency withstand voltagepower with shell, touchable metal parts/power with other terminal groups 2kV/1 min(AC.RMS)
Average work time without stoppage≥50000 hours
The working condition(controller)Temperature-20℃~+60℃
Humidity≤95%RH, without condensation and corrosive gas
Altitude≤2500m

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