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Instrumentation is the technology of using instruments to measure and control the physical and chemical properties of materials.
When the instruments are used for the measurement and control of industrial manufacturing, conversion, or treating processes, the term Process Instrumentation is applied. And When the measuring and controlling instruments are combined so that measurements provide impulses for remote automatic action, the result is called a Control System
It isn't always possible to measure or control the properties of a material directly by instruments. This makes it necessary to deal with variables that affect these properties, such as Temparature, Pressure, Level, Flow, Humidity, Density, Viscosity, and so on.