instrumentation

instrumentation - Control System Instrumentation 1...

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Unformatted text preview: Control System Instrumentation 1. Introduction 2. Sensors, transmitters and transducers 3. Control valves 4. Measurement accuracy Introduction ● Stirred tank heating system » Measured liquid temperature with thermocouple » Transmit signal to controller » Perform control calculation » Send controller output to electrical heater ● Process control system components » Sensor – measures controlled output » Transmitter – transmits measurement signal » Controller – processes measurement signal » Final control element – imparts control action Control System/Process Interface Sensors, Transmitter and Transducers ● Sensor » Produces a physical response related to the process variable » Thermocouple: temperature millivolt signal ● Transmitter » Converts sensor signal to a signal appropriate for the controller » Temperature transmitter: millivolt signal voltage signal ● Transducer » Converts signal from one form to another form » I/P converter: current signal pneumatic signal ● Standard ranges » Analog: 4-20 milliamp, 1-5 volts » Pneumatic: 3-15 psig Sensor Selection Criteria...
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This document was uploaded on 02/04/2012.

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instrumentation - Control System Instrumentation 1...

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