Temperatur and Pressure Controller

• 
  
  working in 24 V DC using Buck converter for high efficiency 
• Used 2-16 blue /white LCD Display with back light
  
• micro controller based circuit.
• 4 relays (24V /10A each)used for Output control .
• microcontroller outputs are opto isolated from relays for additional protection
• sensors for temperature /pressure are 4-20 mA (1-5V) range type
• Can be set desired Temperature /Pressure using UP DOWN Black push buttons in
• the set mode then press the Green OK button the device goes to monitor mode.
• The displayed control range is 0 -100 for 4-20 mA input.

• when the temperature /pressure goes below the preset value then 24 volt

available at appropriate output this can used to switch a contactor on ,hence a

heater or compressor can be switch on.

• when the temperature /pressure reach 5 point less than the preset value,24

volt available at its alarm out put to drive a buzzer and it only off when the

temperature and pressure goes10 point below the preset value

• when the temperature or pressure reach the preset value the apropriate output goes OFF. This will stop the heater and compressor but alarm not OFF
  

• Once the the temperature pressure out put goes OFF ,it will On again only the

temperature /pressure reach 10 point below the preset Value.

• The alarm is to warn the increasing temperature pressure before it reach

presetted over temperataure/ pressure cut off .

• When the device in monitor mode pressing the right black button enable the

setting mode

• power button on the TOP make ON/OFF The unit

• when the unit OFF all relay output goes N/O

• when alarm is activated a bell symbol display showing which alarm is activated

• when the heater or compressor relays are on numeric 1 is dispalayed in the left corner of display and when the relay off it indicate to 0