Instrumentation is the art of measuring the value of some plant parameter or physical amount (pressure, flow, level or temperature) to name a few and supplying a signal that is proportional to the slow parameter.
The output signals are standard signal
s and can then be handled by other tools to deliver indications, alarms or automatic control. There are a number of standard signal;s. hHowever, those most public in a plant are the 4-20 mA electronic signals and the 20-100 kPa pneumatic signals.
Instrumentation engineers are commonly responsible and looking for integrating the sensors with recorders, transmitters, and displays or control systems
, and are responsible for calibration, testing and the important purpose of the system.

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