Recent content by Hilton

  1. H

    Flame detectors generating multiple nuisance alarms randomly

    What is th type of flame detectors? What is the application? What is the fuel?
  2. H

    PID fighting each other

    Add to my reply I made the assumption that the flow loop is the critical loop, if the pressure loop is the more critical then tune it first using the lambda method then tune the flow loop 10 times slower.
  3. H

    PID fighting each other

    The easiest way to decouple the two loops is to use the lambda tuning method. There are several descriptions of this method online . The strategy is to tune the flow loop using the lambda method then tune the pressure loop using the same method but assign the pressure loop a lambda (response...
  4. H

    what are the checks required if the Control valve have Hunting Issue ?

    The trick is to determine whether the problem is with the valve or is a tuning problem. Step one is to put the controller in the manual mode, then you start making small changes in the output (1/2%) in either direction. Document each change and continue in the same direction until you see a...
  5. H

    How do I bring it down and make it stable using a PI controller?

    Also what is the process medium? I.e. gas or liquid.
  6. H

    How do I bring it down and make it stable using a PI controller?

    Need more information, what is the normal set point? What is the final contro element?. What is the time period of the graph? Can you make small process changes in the manual mode?
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