1
Woodrow W Pope: Liquid level and volume measuring method and apparatus. Southwest Pump Company, Harold E Meier, May 13, 1986: US04589077 (50 worldwide citation)

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 ...


2
Woodrow W Pope: Capacitance probe for use in a measuring system for location of a liquid level interface. Southwest Pump Company, Harold E Meier, May 27, 1986: US04591946 (10 worldwide citation)

An elongated capacitance probe for use in a measuring system for locating a liquid level interface in a tank is provided. The probe includes an outer casing having first and second substantially semi-circular matingly engaging portions, the outer casing having top and bottom ends defining a length t ...