Calculate the 0%, 50%, and 100% Calibration Points

Calculate the 0%, 50%, and 100% calibration points for the DP transmitter to measure liquid level in this vessel, given a range of 0 to 30 feet and a process specific gravity of 0.85.

Note the “wet” leg filled with fluid different than the process (SG = 1.1), 35 feet tall:

In this example, the transmitter output loop current range is 10 to 50 mA.

DP transmitter Calibration Points

Calculate the equivalent ΔP range (inch H₂O) and loop current (mA) for 0%, 50%, and 100% of process variable.

Answer:

ΔP range (inch H₂O)

0% = -462

50% = -309

100% = -156

Loop Current (mA)

0% = 10

50% = 30

100% = 50

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Credits: Tony R. Kuphaldt