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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instrumentation - Control System Instrumentation 1....

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