There are a number of new technologies that have been developed for the purpose of monitoring the interface level, the thickness of emulsion and foam layers simultaneously. These include capacitance based using embedded sensors; ultrasonic based with two transducers operating in pulse-echo mode; and devices based on measuring the variations in fluids heat transport; as well as nucleonic with which a number of ways have been configured specifically for the application of subsea separation systems.

Most of these techniques are being currently commercialised. This paper is therefore to review the state of the art of these instruments and that in general of the interface level measurement systems for separators; and to examine the pros and cons for their applications to the industry.

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