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Accuracy in Reading Pressure

sandip B patel

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  • 1 month later...
  • MVP 2023

So what you're saying is the process pressure keeps rising after you shut the valve.  Like its got a spring in it.

I don't think this is a PLC problem, as the HMI and the gauge agree.  If you observe the process when the valve closes, does the gauge say 80 or 90?

What's probably happening is you have some stored energy in the system somewhere in the form of an air bubble or the valve isn't closing quickly enough to clamp the pressure at the setpoint you want.  Without being there to look at it I can only guess.

If the overshoot is always 10 bar or it's predictably linear in some way, I'd modify the logic to shut the valve sooner based on actual observed (empirical) process data.

Joe T.

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