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Description

Description:

Constant temperature and humidity control cabinet widely used in workshop, exhibition,
archives, laboratory, network station.

Our control system for constant temperature
and humidity can save much energy,reduced the working time of compressor,
extend the working time of facilities. PLC is the key unit in our system,it has
good stable, Strong anti-interference ability.The system fixed warm humidity
transmitter as digital transmission.long transmission distance, free of
electrostatic interference. Control precision.

System hardware structure:

The core of system is Siemens PLC, touch
screen as human-computer interface. the temperature and humility transfer by
sensor, It is processed into digital signal by single chip, via RS485 wire
transfer to PLC, and data processing, and controlled via PID. Keep constant
temperature and humility controlling compressor, humidificatin valve,fan valve.

The procedure of control for constant
temperature and humid:

There are 5 method from PLC controlling.

1.   
monitor
status. The system only reads the temperature and humidity of the
environment,without controlling.

2.   
Hand
control status.when compressor forced operation need hand control.You can touch
compressor 1, compressor 2 for start.

3.   
Automatic
humidification, When start this method, the system will work according fixed
upperlimit & lowerlimit.

4.   
Automatic
temperature control. When start this method, the system will work according
fixed upperlimit & lowerlimit. At the same
time, monitor the outdoor temperature is less than 14 ℃

5.   
Circulation
working: combination method 3 & method 4. Temperature controlling then
humidification controlling.