This Month’s Cover Story

Best practices for PID

CT1812 CvrStry lead art2

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,…

Full Story

Resources

NEW!! Control Amplified podcast

With in-depth interviews and discussions with industry experts about important topics in the process control and automation field, Control Amplified explores the underlying issues affecting those in these industries. Listen now.


Test your control knowledge

Greg McMillan and Control Global test your process automation control knowledge in ControlGlobal Quizzes. New quizzes are released every two weeks. Test your smarts.

Our latest issue: November 2018

It may not get all the attention lavished on the IIoT, virtualization, cloud computing and other forms of digitalization, but none of these phenomena would be as powerful without the wireless technologies supporting them 24/7/365Read the issue.


Level Measurement, Part II

The latest eBook from Control continues the conversation about level measurement. In this eBook, you will find a collection of articles covering various aspects of level measurement. Download it here.

Voices: Ask The Experts

How to optimize pumping cost

Use a variable-speed pump and minimize valve pressure drops.

Q: Delivery of transmix fuel to two separation towers is being upgraded. Coriolis meters were installed and are currently functioning. Two PID flow control loops currently maintain flow. The transmix liquid passes through a series of heat exchangers on its way to the towers. It is estimated that…

Full Story

Most Recent

  • Basics of PID in 25 points

    By Gregory K. McMillan and P. Hunter Vegas

     Measure each flow, inventory (e.g., level or weight and pressure), every process variable for safe operation and environmental protection, and each indicator of process efficiency and capacity (e.g., composition, quality, pH, and temperature) with sufficient accuracy (particularly least…

    Full Story
  • Best practices for PID

    By Gregory K. McMillan and P. Hunter Vegas

    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…

    Full Story
  • A little help for those who share my aversion to “digitalization”

    By Paul Studebaker

    My job is slinging words, and while there are others who do it better, I take it seriously and consider my ability one of my few points of pride. I can explain most complex topics clearly, logically and succinctly, and in a way that has even won national awards. So, you can imagine my…

    Full Story
  • Raising professional performance

    Greg: I have greatly appreciated the opportunity to be part of the committee to review and improve the Automation Competency Model created by the Automation Federation (AF) for the U.S. Department of Labor (USDOL). The industry review committee is led by Steve Huffman, vice president of marketing…

    Full Story
  • Product roundup: I/O and terminal blocks

    Four-port serial I/O in chassisGRV-CSERI-4 groov serial I/O module plugs into a groov Edge Programmable Industrial Controller (EPIC) chassis alongside the new groov EPIC and discrete and analog I/O modules; enables EPIC to add communication with RS-232 and RS-485 serial devices; and provides the…

    Full Story
  • Use contractions to show you care about reaching your audience

    By Jim Montague

    Process control engineers and other technical professionals don't talk like robots, so why do they write like robots?I ask this question because I've spent way more time than I expected over the past 20 years correcting submitted texts to add contractions. You know, turning "is not" into "isn't,"…

    Full Story

Latest Products