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I have a DP transmitter on a LPG bullet pressurized to between 3 bar to a maximum of 6 barg. The bullet diameter is 4 metres and
the transmitter is a smart 143DP Foxboro-Eckhardt model. The problem is, the original installation had the HP & LP ports connected to the Bullet liquid & vapour tappings respectively through impulse tubing. The transmitter reading used to drift in a +/- 10% range. This was apparently due to LPG vapours condensing in the LP leg.
Now I have added a seal pot with water in the LP leg and the reading does not drift but i am not sure about calculating the lower and upper range values. Can somebody please advise me on how to calculate these? Has anybody tried heating the LP leg instead of using a seal pot?
Thanks in Advance.
Sumeet
the transmitter is a smart 143DP Foxboro-Eckhardt model. The problem is, the original installation had the HP & LP ports connected to the Bullet liquid & vapour tappings respectively through impulse tubing. The transmitter reading used to drift in a +/- 10% range. This was apparently due to LPG vapours condensing in the LP leg.
Now I have added a seal pot with water in the LP leg and the reading does not drift but i am not sure about calculating the lower and upper range values. Can somebody please advise me on how to calculate these? Has anybody tried heating the LP leg instead of using a seal pot?
Thanks in Advance.
Sumeet