According to process control experts, a detailed and specific set of control valve requirements is more than necessary when it comes to good control loop performance.

So, the next time somebody suggests getting rid of single-loop control in an APC application, just ask, “What about unmeasured disturbance variables?” Do not expect a righteous reply. Single-loop ...

Mike: Nearly every analog instrument uses the 4-20 mA loop. Field transmitters, positioners, and variable frequency drives ...

Poor control loop performance often makes itself evident as excessively large deviations between the process variable and its set point. An operator may notice the deviations on his process trend ...

I was nursing a lukewarm vending machine coffee recently when I overheard two fresh-faced engineers complaining about the PID tuning process and coming up with ways to tear down centuries of control ...

In this article, as in industry, advanced process control (APC) refers primarily to multi-variable control. Multivariable control means adjusting multiple single-loop controllers in unison, to meet ...

Two process control signaling schemes were to be supported — the 0 to 10 VDC analog signal, and the venerable 4-20 mA current loop.

Only through proper troubleshooting and then solving the underlying problems can control loop performance be improved. Process design certainly plays a role in control loop performance, but ...

Control loop performance-monitoring software can help to improve loop performance at electric power plants by automatically collecting data, assessing several aspects of loop performance, and ...

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