Control System

What is a ‘controller’? Area of application?

Standalone controller (PID) A controller is an instrument used for controlling a process variable (measurement). Its continuously monitors the error signal and gives a corrective output to the final control element. a    measurement variable       desired variable c    deviation       output Measurement variable: It is the demand variable measured and controlled. Desired Variable: …

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[Instrumentation Questions] What are process variables? and Define all the process Variable and state their unit of measurement?

What are the process Variables? The process Variables are: • Flow. • Pressure. • Temperature. • Level. • Quality i.e. % O2, CO2, pH etc. Define all the process Variable and state their unit of measurement. ? Flow: Any fluids or liquids flowing from one place to another place is called flow and it is …

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