Instrumentation
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Instrumentation is a collective term for measuring instruments, used for indicating, measuring, and recording physical quantities. It is also a field of study about the art and science about making measurement instruments, involving the related areas of metrology, automation, and control theory.
The term has its origins in the art and science of scientific instrument-making.
A local instrumentation panel on a steam turbine
Example of a single industrial control loop, showing continuously modulated control of process flow
Pneumatic "three term" pneumatic PID controller, widely used before electronics became reliable and cheaper and safe to use in hazardous areas (Siemens Telepneu Example)