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A capacitive technique measures the capacitance changes from the introduction of a di-electric substance. In this case, both oil and water are insulators and have superior and distinctive difference in di-electric constant or the insulation value.
The measuring method consists of two conductive electrodes with a non-conductive layer between them. The non-conductive layer is typically a metal oxide or a special polymer. The capacitance of this layer changes with water content and causes a change in voltage between the two conductive electrodes.
In addition, the micro-capacitance technique resolves all types of interferences to the test results, including presence of acid in water, alkali concentration and ion concentration.
The principle of micro-capacitance measurement for water in crude oil is not the same as to the traditional capacitance technique. There are differences in many techniques such as:
As featured on The Business Times.