I am new to preparing Instrument Datasheet for DP Flow transmitter. I have process data like Flow, Design Press & Temp, Operating Press & Temp, Density, viscosity. Using Orifice with tap flange for DP measurement. I am not sure how to decide the calibration range for DP flow transmitter now in inches of water column. Also I am confused while seeing some samples like 0 to 500 inWC while some shows -250 to +250 inWC. how to decide that now!
Thanks in advance.
Thanks in advance.