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This is to test Bayt's expert people for this kind of measurements.
we use displacement type levetroll(fischer) for interface level measurements ,using DPT i doubt measuring interface level in tank(used where head measurements applicable)
Interface measurements are not reliable using a DPT, a multivariable DPT is better option, also RF Capacitance is best and economic option
We can measure DP type meter. you calculate lower density liquid of100% is4mA. and Higher density liquid100% is20mA. at dp transmitter.