The DP Level transmitter installed very near to HP tapping point and configured in wet leg.Schematic Diagram of a Closed tank DP Level Transmitter with wet leg elevation zero direct mount Calibration

Closed tank DP Level Transmitter with wet leg elevation zero direct mount Calibration

Formulas:

Min range = (SG x X1) – (SG x H)

Max range = [(SGxX1) + (SGxX2)] – (SGxH)

Example:

If the height is 0.5 cashew an X1, X2 is 2 meters and height H is 3 meters, there is fluid in the tank which has a density of 1 g / cm3, what is the range of calibration on the transmitter?

SG = 1

Min range = P High – P Low

= (SG x X1) – (SG x H)
= (1 x 0.5) – (1 x 3)
= 0.5 to 3
= – 2.5 mH 2 O

Max range = P High – P Low

= [(SGxX1) + (SGxX2)] – (SGxH)
= [(1×0,5) + (1×2) – (1×3)
= 2.5 – 3
= -0.5 MH 2 O

The transmitter Range = -2.5 to -0.5 mH 2 O