Wendell S. Rice, Parsons Technical Services

Take control of PID tuning

Process control can be open or closed loop. An open loop is one in which there is no feedback to the controlling unit. Actuating a switch and setting a potentiometer are simplified examples of open loop control. Open loop control is essentially a manual operation. Control of a process, such as temperature of an industrial furnace or level in a tank, typically requires closed loop control.