Professor Robert L. Heider, PE. Adjunct Professor, ChE, Washington University ~45 years experience doing “Process Control” Professor for the DPCL, ChE433. Lecture Includes:. What is "process control"? Hardware and Software (firmware)
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Adjunct Professor, ChE, Washington University
~45 years experience doing “Process Control”
Professor for the DPCL, ChE433
“Operating a processing plant or facility such
that the product quality and production rate
specifications are met in a safe and
Involves both hardware and software or
firmware functioning together.
(line in middle indicates
Electrical Signal (4-20 mA)
Pneumatic Signal (3-15 psig)
(arrow indicates flow/signal direction)
Material Flow LineProcess Instrumentation Diagram: Feedback Control – Basic Format
Current to pneumatic
for safety and
Often the sensor is integrated into the transmitter and the I/P converter is integrated into a
position controller or “valve positioner” on the actuator that is also not shown on the P&ID.
Preceded by area or plant number
# that uniquely identifies instrument
From Latin trānsdūcere, to transfer : trāns-, trans- + dūcere, to lead
A device that converts one type of energy or physical attribute to another for various purposes including measurement or information transfer
Also called an “Element”
A transducer which responds to a measured variable by means of a sensing element, and converts it to a standardized transmission signal which is a function only of the measured variable.
Output final element linearity – usually is not, consider:
SCR Silicon Controlled Rectifier – AC power phase control