How can a D.P. transmitter be calibrated?

1.     D.P. transmitter can be calibrated using following  steps:

1. Adjust zero of Xmtrs.2. Perform static pressure test: Give equal pressure on both sides of transmitter. Zero should not shift either side. If the zero shifts then carry out static alignment. 3. Perform vacuum test: Apply equal vacuum to both the sides. Zero should not shift. 4. Calibration procedure: Give20 psi air supply to the transmitter and vent L.P. side to atmosphere. Connect output of the instrument to the standard test gauge. Adjust zero. Apply required pressure to the high pressure side and adjust the span. Adjust zero gain if necessary.

Zero calibration make low and high to atmosphere zero differential  press zero button or tune button according transmitter then to calibrate span inject pressure from pump to set point then press span or tune the button ensure20ma 

make a2nd trial to ensure linear output 

yes correct