Answer / vijay

close the hp and lp valve and drain the water then open the
vent valve it should show the zero value.

Answer / jayaram

1.close the both HP and LP rootvalves
2.open the both HP and LP drain valves to drain the service
completely.
3.Close the drain valves.
4.open the vent caps of both HP and LP leadlines near the
rootvalves.
5.fill the lead lines completely with water.
6.obviously LP side , more pressure acts and current goes
below 4mA. So elevate the Zero Potentiometer to 4 mA(this
is for analog standard dp transmitter).
7.first of all you have to calibrate the dp transmitter for
the required range, then only you can do this elevation
zero checking.

Answer / altamash

close the both valve ie LP & HP then drain the water and then open the vent of LP then connect the HART and do the zero trim by HART then we can find ZERO

Answer / vishal

Just open the equilizer valve and u will get zero
No need to open or close any other valve
Check by multimeter

Answer / suresh agravat,jamnagar

first close the rootvalve then drain trhough needle velve
then close both LP and HP isolated valve and open equliser
valve

Answer / muhammad yasir

close HP isolation valve open HP side drain valve.Transimiter read maximum Differential pressure and Transimiter show O% Level or 4ma because LP lmpluse line liqued act pressure on LP side Transimiter.
When span check close both HP and LP side valves and open drain valve Transimiter read 0 differential pressure.Transimitter show 100% level or 20ma.

Answer / faiyaz ahmad

first open the equalizing and then close the isolation valve and open the vent valve both side and make it zero in this condition transmitter will show zero.

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