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Best practices for PID

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Proportional-Integral-Derivative (PID) control is used in more than 99% of the loops for chemical, pharmaceutical, and food and beverage production. PID has proven to be capable of the best load rejection by using the best tuning and the extensive flexibility of functionality offered by the PID structure and options, most notably external-reset feedback. Bohl and McAvoy enlightened us about it in a 1976 landmark paper, “Linear Feedback vs. Time Optimal Control, II. The Regulator Problem” (Industrial & Engineering Chemistry, Process Design and Development, Vol. 15, No. 1, 1976, p. 30-33).The opening challenge with PID control is recognizing the effect of PID form,…

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Our latest issue: December 2018

PID control is used in more than 99% of the loops for chemical, pharmaceutical, and food and beverage manufacturing. However, the opening challenge with PID control is recognizing the effect of PID form, structure and tuning units. Read the issue.

Flow Measurement, Part II

The latest eBook from Control continues the conversation about flow measurement via a collection of articles about the latest trends, technologies and implementations. Download it here.

Voices: Ask The Experts

Do multiple sensors improve accuracy?

Is there a process control degree and if so, at which universities?

By Béla Lipták

Q: I'm quoting from Chapter 1.1 of your "Instrument Engineers' Handbook," Volume 1 (5th Edition): "In critical applications, reliability and accuracy can both be increased by the use of multiple sensors through the averaging of their outputs. ... measurement error in that case will be reduced by…

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