Beckman Instruments, Inc.

Eric W Lachenmeier

R Fred Pfost

Dale R Pfost

A liquid boundary level detector employing an open-ended conduit which directs pressure waves toward a liquid boundary layer. The conduit is moved from a starting position toward the liquid boundary and, upon contact with the boundary, there is a change in acoustic impedance within the conduit. This change is monitored and a signal is generated indicative of such contact. Once the initial liquid boundary position is determined, that may become the reference position for subsequent liquid boundary measurements or motions.

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San Jose, CA, United States of America

Eric W Lachenmeier