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Line 4: ==Control system use== [[File:Set-point control~~<ref>'' ''</ref>~~.png\|thumb\|Block diagram of a [[Negative feedback\|negative feedback control system]] used to maintain PV = SP]] Measurement of process variables are essential in [[control system]]s to controlling a process. The value of the process variable is continuously monitored so that control may be exerted.

Process variable: Difference between revisions