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PID Controller Trainers, Model 8972 is analog based.The analog Controller has inputs from potentiometers and moving coil meters to display the inputs and outputs.The controllers have got 4- 20 mA/0-5V input and output, proportionate band from 2 to 500%, integral action time of 0.03 repeats per minute and dervative action time 0 to 10 minutes.The set point is 10 to 90% of output in both the cases.