PID is an acronym that stands for Proportional, Integral, Derivative. PID Controller can keep an automated process like temperature, pressure, or flow constant for you automatically. PIDs use a control loop feedback or process variable to monitor where the output should be. These usually come in the form of sensors and meters. PIDs come in many different forms including standalone units and PLC programming. We can use our input and output cards along with programming software to set up a PID.