Temperature & Humidity Controller WHD20R-22

● Two channels temperature & humidity (with sensor)

● Measuring temperature range: -40~+99℃

● Measuring humidity range: 20%RH~90%RH

● Display: LED display

● Optional function: 1 channel alarm output

● Optional function: RS485(Modbus-RTU) communication

● Temperature and humidity measuring & controlling

● Din Rail Mounted

  • product detail
  • FAQ


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.


Technical Parameter WHD48 WHD72 WHD46 WHD20R

Measuring range
Temperature -40℃~99.9℃
Humidity 20%RH——90%RH

Temperature ±1℃
Humidity ±5%RH

Set range of controling parameters
Heating for temperature rising -40℃~40℃
Blowing for temperature decreasing 0℃~99.9℃
Humidity 20%RH~90%RH

Optional function
Communication RS485 Modbus-RTU
Analog output No DC4-20mA No
Alarm No 1 alarm output
Auxiliary power supply AC85~265V, DC100~350V
Insulation resistance ≥100MΩ

Front Panel



Typical Connection

Technical Parameter Value
Measuring range Temperature -40.0℃~99.9℃
Humidity 20%RH~90%RH
Accuracy Temperature ±1℃
Humidity ±5%RH
Analog output DC 4~20mA
Set range of controlling parameter Heating for temperature rising -40.0℃~40.0℃
Blowing for temperature decreasing 0℃~99.9℃
Humidity control 20%RH~90%RH
Contact capacity 5A/AC250V
Communication RS485(MODBUS-RTU)
Auxiliary power supply Working range AC 85~265V DC 100~350V
Basic power consumption(≤0.8w)+
relay power consumption(each channel≤0.7w)
Insulation resistance ≥100MΩ
Environment Temperature -20℃~+60℃
Humidity ≤95%RH(No condensation)
Altitude ≤2500 m

Q: Connect users between the sensor and the controller, can it be matched? How long is the length in meters?

A: The user can wire, but it is required to use a 4-core shielded wire, and a 2.5-meter shielded wire is attached to the factory. The longest distance between the sesor and the controller is 20 meters.

Q: Can WHD Switch control manually and automatically?

A: Yes, but be sure to explain to the customer service before placing an order, it is an unnormal operation.

Q: User have their own sensor, can they buy a controller?

A: No, the sensor and controller need to be used together, 2 device can not sold seperately.

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