Inorganic chlorides, suspended solids, and trace metals found in untreated crude must be removed by chemical or electrostatic desalting. This reduces the risk of acid corrosion, plugging, fouling and catalyst poisoning in downstream units. Measurement of the oil/water interface in the desalter is crucial in separating the cleansed crude from contaminants.
Coating and build-up on probes may create interface measurement errors. Instruments susceptible to electrostatic grid interference may require special filters. Interface dedicated level transmitters fitted with quick-disconnect probes provide optimum performance while reducing cleaning and maintenance time.