August 2017

Process Control and Instrumentation

The lost art of proportional band, and the accidental art of performance monitoring

Most control engineers know that proportional band and controller gain are largely interchangeable terms—both terms refer to the proportional setting of a proportional-integral-derivative (PID) controller and are commonly used by control system manufacturers.

Kern, A., APC Performance LLC

Most control engineers know that proportional band and controller gain are largely interchangeable terms—both terms refer to the proportional setting of a proportional-integral-derivative (PID) controller and are commonly used by control system manufacturers. Proportional band and controller gain are inversely related by Eq. 1, such that a gain of 1.0 is equivalent to a proportional band of 100%, and larger gain values equate to smaller proportional band values. Gain = 100%/PB, where PB = Proportional band, %      (1) However, most control engineers are less aware that industry has morphed in past decades from mainly using a proportional band perspective on loop tuning to predominantly usi

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