A new version of ExperTune's PID Loop Analyzer includes a stiction check wizard. The wizard provides a simple way of measuring the stiction in the control loop. The wizard works on the installed valve, giving a true measure of the in-service valve stiction. Measuring the in-service stiction is much more significant than measuring it when the valve is not in use.
If the measured stiction is larger than 1 percent, then repairing the valve can result in much better performance and increased product quality. Reducing stiction may eliminate a troublesome cycle, resulting in product made closer to specification with less energy.
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