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.
The Author
Allan Kern is the owner of APC Performance LLC. He has more than 30 yr of advanced process control (APC) experience and has authored numerous papers on effective, low-maintenance APC solutions. He is the inventor of patented Rate-Predictive Control (RPC), industry’s only inherently adaptive control algorithm; and of XMC, industry’s only model-less method of multivariable control. Mr. Kern holds professional engineering licenses in control systems and chemical engineering, is a senior member of the International Society of Automation (ISA) and is a 1981 graduate of the University of Wyoming.
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