Process variable: Difference between revisions

Revision as of 19:51, 11 August 2011

Revision as of 22:31, 29 November 2011

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A '''process variable''', '''process value''' or '''process parameter''' is the current status of a process under control. An example of this would be the temperature of a furnace. The current temperature is called the process variable, while the desired temperature is known as the [[setpoint (control system)|set-point]].

Measurement of process variables are important in [[controlling]] a process. The process variable is a dynamic feature of the process which may change rapidly. Accurate measurement of process variables is important for the maintenance of accuracy in a process. There are threefour commonly measured variables which affect chemical and physical process: [[pressure]], [[Thermodynamic temperature|temperature]], level and compositionflow.