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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 four commonly measured variables which affect chemical and physical process: [[pressure]], [[Thermodynamic temperature|temperature]], level and flow.{{cn}}
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