Process variable

This article is about the engineering indicator. For the mathematical concept used in thermodynamics, see process function.

A process variable 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 set-point.

 Measurement of Process Variables are important in controlling a process. The Process Variable is a dynamic data which changes rapidly.

So it becomes necessary to measure process variables for the maintenance of accuracy in a process.Generally three type of variables 

are there Pressure,Temperature,Composition Which affects the Chemical or Physical Process Which also called Process Parameter.