Instrumentation is the combintion of electrical,mechanical and electronics.In the first stage of instrumentation the connection between the instrument and controller were mechanical(Pneumatic connection).In pneumatic connection 3-15 psi pressure was used as signal.In 1970’sindustries started to using electrical connection between instrument and controller instead of pneumatic connection.Two types of signals are using in electrical transmission.
1.Analog
2.Digital
The basic parametrs of instrumentation are.
1.Temprature
2.level
3.Flow
4.Pressure
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