How to calibrate a orifice differential pressure flow
transmitter in process?

How to calibrate a orifice differential pressure flow transmitter in process?..

Answer / ayaz

first communicate ccr tag conform and turn MOS if required 
when 5 way manifold
1 hp side close 
2 equalizer  open
3  lp side close
and then hp and lp drain or vent should be open
the transmitter will show zero if not calibrate it
first adjust the zero 
2nd second span check and adjust 
and then service 
1 drain or vent close
2 equalizer close
3 and then hp side open and lp side open

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