The position transmitter model used in some control valves (very critical) will be discounted soon. Thus, a study of the options to solve this issue by replacing it with a new sensor have started. First trials were done using a cheaper sensor to study the response of the system, but they resulted in valve hunting.
There is a list of potential root causes of this issue, but the ones I am most concerned are:
1) I presume every transmitter might have different response times. Perhaps the response of the new one is faster/slower than the speed of demand signal (tuned based in the characteristics of the old sensor), thus this mismatch is the responsible for this valve hunting. Could this be possible?
2) In such case, what would be the way to fix it? Tuning the PID again? Could it be solved adjusting the Gain of the feedback?
Some background:
-The mechanical installation of the sensor was a temporary arrangement, so maybe it was not as robust as it should be and some vibrations might have occurred.
Any advice is very welcome!
There is a list of potential root causes of this issue, but the ones I am most concerned are:
1) I presume every transmitter might have different response times. Perhaps the response of the new one is faster/slower than the speed of demand signal (tuned based in the characteristics of the old sensor), thus this mismatch is the responsible for this valve hunting. Could this be possible?
2) In such case, what would be the way to fix it? Tuning the PID again? Could it be solved adjusting the Gain of the feedback?
Some background:
-The mechanical installation of the sensor was a temporary arrangement, so maybe it was not as robust as it should be and some vibrations might have occurred.
Any advice is very welcome!