![]() A controller is tasked to monitor the current measurement (i.e., process variable or PV) as it deviates from setpoint (SP) and take corrective action based on this deviation. The basic control loop in its simplest form would consist of a single measurement, a controller, and an output which usually is a control valve or another controller (more on cascaded loops later).Ī controller can be as simple as an On-Off controller such as a household thermostat, however, most regulatory control in industry will require more dynamic control and therefore utilizes the Proportional-Integral-Derivative (PID) controller. Industrial processes can be automated in various ways, typically by some measurement such as level, temperature or pressure and controlling some final element such as a control valve. The following series of articles aims to provide the reader with a brief overview of various control schemes typically encountered in industry complete with deconstruction and examples of application. ![]() ![]() The sight of control blocks on a Piping & Instrumentation drawing (P&ID) may seem confusing and daunting for the uninitiated, but having some basic understanding of process control can help in deciphering these little black boxes of logic. ![]()
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