We measure the level in a small propylene vessel using a 3051C with 1199 capillary seals. It is a balanced system. During warm weather, we experience a positive zero shift in the measurement. The transmitter is only spanned from 0 - 13 inH2O, and the vessel is normally only vapor - think of it as a knock out drum. And our installation isn't ideal since the capillaries are probably much longer than necessary to reach the process nozzles.
I just re-read the Emerson white paper that discusses tuned systems vs. balanced systems, and I believe I understand what is going on. I'm sure a tuned system with an appropriate length low side capillary would perform better than what we have. But I'm curious if just raising the transmitter would cancel out the change in density to the point where the error is cancelled out? If so, what would the right elevation be? Even with the top tap, centered between the taps?
Thanks for your thoughts,
Kevin Schroeder
In reply to kevwe ujevs:
Hello
You will need to consult the YTA product manual for the instructions on how to do the zero trim. Below is a ink to a manual (I am not sure if this is the latest version).
https://web-material3.yokogawa.com/IM01C50T01-01EN.pdf
Page 3-4 lists the menu tree with the corresponding HART communicator buttons for the various commands. These should be applicable for a 475 communicator.
Thank you,
Michael