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I am looking for references and proven installation examples in interface level measurement for an application for which we need to measure the oil/water interface in a refinery electrostatic desalter. There will be an emulsion layer between the oil and water phases, the probe must accurately read the top of the water level. Basic information: Oil Specific Gravity: 0.867 Water Specific Gravity: 0.919 Vessel Dimensions: 12' OD by 55' Length Code Stamp: ASME w/NB Reg. Design Pressure: 15 BARG @ 175 Degree C MAWP: 15.65 BARG @ 175egree C Operating Pressure: 11.9 BARG @ 149 Degree C Displacer technology peformance is currently below acceptable standards. RF admittance, capacitance, microwave, and guide radar are possible solutions.