DP capillary level issue

Gents, I have an issue with DP capillary level transmitter installed as HH for discharge vessel for a booster gas compressor.

The transmitter activates by fault while both LC and LL indicates that the vessel is empty, function test was carried out and found working properly, the diaphragm was cleaned, but as soon as it is in service the problem appears again did anybody experienced such a situation

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