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Abstract

A four-electrode open-cell conductivity sensor for measuring the conductivity of ocean water. A simplified version of the conductivity sensor may be used as a standard conductivity cell for measurement of fluid conductivity in a laboratory, or for monitoring fluid conductivity in a chemical processing plant. The sensor includes opposed electrode pairs each of which include a hemispherical current electrode and a coaxial ring-shaped voltage electrode. In operation, an alternating current is generated across the opposed current electrodes and the resultant electric field is sensed by the voltage electrodes. A feedback circuit is utilized to adjust the amplitude of the electric current generated across the current electrodes so that the inphase potential across the voltage electrodes is maintained at a substantially constant level. The conductivity of the fluid between the opposed electrode pair can be obtained directly from the current flowing across the current electrodes without the need for precalibrating the sensor against known conductivity standards.

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First Claim