Agent
Wegner & Bretschneider
Grantee
Tankmaster Limited
Primary examiner
Charles Frankfort
Primary examiner
Thomas B. Will
Application number
575268&
Kind
A
Document number
4669309
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Tank contents gauge

4669309 - 575268& - USPTO

Application Jan 30, 1984 - Publication Jun 02, 1987

John Cornelius

Abstract

A tank contents gauge is disclosed having two pressure sensors to sense the liquid pressure at two tank positions at known vertical separation, a port to sense the ambient pressure in the tank, and a transducer to which the three pressure readings are transmitted one at a time by a switching mechanism. If the transducer is a differential transducer, its second side is connected to the port to allow (1) comparison of the pressure readings with the ambient pressure reading and (2) determination of transducer offset to adjust the calculations to give accurate readings. The readings are analysed by a data processing system which can provide volume and weight readings by internal look-up calibration tables. The system may also control the switching mechanism. Specific gravity values can be calculated from the pressure readings and the known vertical separation; the values can be stored in the system for use when the tank contents approaches, or falls below, the level of the upper sensor.

Description

Claims

Other sources for this patent

  • Rechargeable galvanic cell with zinc electrode and auxiliary structure

    4039729 - 575268& - USPTO

    Application May 07, 1975 - Publication Aug 02, 1977

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