Piping & Instrumentation Diagram for a distillation column including parameter controls, labelled symbols and letter key. A Distillation Column PID is a general feedback control loop mechanism widely used in industry. A Distillation Column PID controller attempts to minimize the error between the desired setpoint and a measured process variable by calculating it and then taking corrective action to adjust the process. The PID controller has three key parameters: proportional, integral, and derivative. The proportional controller determines the reaction to the calculated error, the integral controller determines the response based on the sum of recent errors, and the derivative controller determines the reaction based on the rate at which the error has changed. P&ID diagrams might look difficult, but with the help of EdrawMax, you can make them in just one single click. Download EdrawMax today and work on pre-built templates.