Beckman Instruments, Inc.

Constance Van Lenten

Elmer A Sperry, Iii

Robert Rosenthal

An electrode housing for a fluid conductivity cell contains a chamber in which electrodes are securely positioned, the walls of the housing being electrically nonconducting and having at least one chamber duct penetrating the walls of the housing for the ingress and egress of fluid to be measured. The chamber duct is located relative to the electrodes such that it is substantially coincident with at least a portion of a line of equipotential established at the inside surface of the chamber in response to a voltage applied to the electrodes. The chamber duct is a size and shape to provide a negligible voltage drop across any dimension thereby substantially confining a conduction of current between the electrodes to the chamber of the electrode housing.

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Hawthorne, NJ, United States of America

Constance Van Lenten