Answer / kashif

Isolate the Tx from process and fully depressurized it and checked if it reads 4 Ma then calibration is OK and carried out flushing of both impulse lines and gain take it in service it should read zero or 4 Ma.

Answer / bala

if the transmitter shows 4.5ma at zero pressure. we need to trim the tx by using hart communicator. there is an option in hart digital to analog trim. go to that option and make a trim and so if not D/A trim not proper then last need to replace the new transmitter.

Answer / rajesh

After the transmitter calibration they already fix the
transmitter on the prosces line. that time u check the
process line how mach pressure and check the 5 way manifold
condition and check the LP side impulseline chook. if its
ok manifold and impules line; open 5 way manifold equlizer
valve close any one hp or lp isolation valve that time tx
should be show zero 4ma. not showing 4ma. trim it zero.
zero not trimed cheange the transmitter.
Importent.
check the LRV how much its Zero Or not.
and check the wich type of transmitter.
if it is level transimtter that one different type of
callibration. check the where using the prossce line.
thank you
rajesh

Answer / balakrishnan

no. it wont affect the pocess.

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