04589077 is referenced by 50 patents and cites 14 patents.

A liquid level height within a tank is measured by means of an elongated multi-segment capacitance probe that includes a column of capacitors extending through a liquid level interface. Each capacitor of the probe is sequentially measured in response to microprocessor controlled instructions as part of a measuring unit located at the tank. Up to sixteen measuring units may be interconnected in a field and individually connected to a microcomputer system at a central station. The microcomputer system addresses each of the measuring units and sends a select signal to the microprocessor controller of the measuring unit to sequentially measure each capacitor of the probe. By identifying the capacitor at the liquid level interface, the height of liquid within a tank is computed by the microcomputer system. From this height measurement and stored tank data, the volume of liquid within a tank is calculated. Associated with each of the capacitors of the probe is a temperature sensor for generating a temperature correction factor for the volume calculation.

Title
Liquid level and volume measuring method and apparatus
Application Number
6/517590
Publication Number
4589077
Application Date
July 27, 1983
Publication Date
May 13, 1986
Inventor
Woodrow W Pope
Garland
TX, US
Agent
Harold E Meier
Assignee
Southwest Pump Company
TX, US
IPC
H01G 5/34
H01G 5/28
G01F 23/26
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