IM1965 Differential Temperature Controller

Typical temperature controller monitors the single input from source like RTD,4-20mA and tries to maintain that temperature within limits at a pre programmed constant level. A differential temperature controller goes with the name, monitors temperature from two input sources and tries to maintain the difference between these two temperatures as constant. These are widely used in Solar Energy Systems now a days to provide maximum operating efficiency and flexibility. It is designed to maintain the difference betwenn two tmperature sensors e.g., In case of self powered solar box furnace or in case of a solar water collector. By considering one input as a reference, temperature level is maintained by automatically switching ONOFF a fan or a pump.