PID Controller Economics

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Process Performance is not as good as you think

 PID controllers at lowest level

• PID controllers are the “workhorse” of Process Industry

• 90 % of the controllers are PID’s

• More than 30 % of PID’s operates in manual

• More than 30 % of loops increase short term variability

• About 25 % of loops use default settings

• About 30 % of loops have equipment problems

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How could the benefit generated:
 

Batch time reduction through increased throughput in a non saturated market

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•More stable operation (operator load)

•Less system load (lifetime)

•First step towards APC

APC not useful when PID’s are badly tuned