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Acrel WHD Serise Temperature & Humidity Controller


Adjustment and control of temperature and humidity

Application: high voltage switchgear, terminal box, ring network panel, box transformer substation etc.

Protect relevant equipment from faults resulting from excessive low or high temperature, creepage or flashover etc.from humidity or  condensation.


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Overview

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.

Operational principle

The controller for temperature and humidity mainly consists of three parts of transmitter, controller, heater(or fan etc.), its operational principle is shown as following:

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The message of temperature and humidity in the box is detected by the sensor and analyzed by the controller:

When environmental temperature, humidity is up to the presetting value or exceed the presetting value, the controller is giving related signal to contects of relay, then the heater(or fan) is energized and working to heat of dehumidifying;after environmental temperature,humidity is well below the presetting value,the heater(or fan) is deednergized and stop working. In addition to its basic functions, the specific product with different type possess secondary functions such as alarming output for wire-breaking,communication,forced heating etc.

WHD Series Intelligent Temperature & Humidity Controller

Type explanation

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Note:

1.Number 0f temperature, humidity(or temperature) sensor to be connected with WHD48,WHD72,WHD20R,WHD46 is up to 1,2, 3 respectively;

2.Every sensor match with two control output contacts(passive), connected with heater and fan respectively,the heater is used for rising temperature or removing moisture,the fan is used for decreasing temperature;

3.uxiliary function of WHD46:RS485 communication,alarming output function and transmitting function. Only one can be selected. Auxiliary function of WHD48:RS485 communication. Auxiliary function of WHD72:Alarming output function,RS485 communication and transmitting function.The

latter two can only be selected. Auxiliary function of WHD2OR:RS485 communication and alarming output function.Both can be selected at the same time. "- C"for communication,"-J"for alarming,"-M"for transmitting

4.The connecting wire between sensor and controller must use four-core shielded cable. And its maximum length must not exceed 20 m.

Technical parameter

Technical parameter
Value
Measuring rangeTemperature-40.0℃~99.9℃
Humidity0%RH~99%RH
PrecisionTemperature±1℃
Humidity±5%RH
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 gap 5
Communication portRS485,MODBUS(RTU) treaty

Start/stop gap: In the control process,for the execution part (heater or fan) , the difference between starting temperature( humidity) and stopping temperature (humidity).

Product specification and functions

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