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I tested the process disturbance today and sadly, it is still too big of change for it to adjust to if you vent fast, but if you vent slowly (15psi/min), it works fine. Final Settings: P .5 I .1 D .01 Coriolis meters are hard to work with sometimes, but when they work, they are great, and...

I actually seem to have it tuned simply by setting the D to its min value (cant use 0 in our system), I to its minimum, and cut P in half. That was enough to destroy the exadgeration in the adjustments. I have yet to test venting on the new tuning though.

I am trying to control a pneumatic valve on a flow line which ranges from 0 to .5 #/min. The valve is run by an I to P of course and the line flow also depends on a pressure differential, because it is not pumped, but blown through the line. The noise seems to come from the flow rate read by a...

I am trying to determine how to tune the PID variables for a case where the flow rate jumps around up to 10%. I have not been able to try bumps yet, due to process use. The symptoms of the problem are: -Auto has a "sweet spot" and only works at that pressure difference. -Any jog in pressure...