How do you calculate interface level?
The reading of the Differential pressure (DP) expressed as a percentage of the span can be used to pinpoint the location of the interface between two fluids that have been mixed together.
The formula that is used to compute the interface is as follows:
IL= {(DP- LRV)/S} *L
IL = Interface level
LRV = Lower range value of the DP level transmitter
DP = Measured differential pressure by the transmitter
S = Span value calibrated transmitter (URV – LRV)
L = Engineering range of the liquid interface level
LI = Lighter liquid level need to be measured
L2 = Heavier liquid level need to be measured
Interface level calculator
The below calculator used to calculate the interface level from the differential pressure indicated by the transmitter
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