RAM vent capacitance level probe with overfill leak detection ca

Details RAM vent capacitance level probe with overfill leak detection ca RAM vent capacitance level probe with overfill leak detection ca

1993-04-21

1995-03-14

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324690, 73304C, G01F 2326

Patent

active

053979958

ABSTRACT:
An improved capacitance level probe is shown which can be positioned within the return vapor passage of a coaxial vapor recovery refueling system for detecting changes in liquid level within an underground fuel storage tank. The level probe has an outer conductor, a spaced inner conductor, a closed upper end and a lower end with an end opening which allows liquid to enter and leave the interior of the probe as liquid level changes within the underground tank being monitored. A tubular impact vent is located at the upper end of the outer conductor and collects tank vapors from the return vapor passage in order to conduct such vapor pressure to the open interior of the outer conductor above the level of liquid within the outer conductor. This action prevents sudden pressure drops within the outer conductor as the level of fuel changes within the underground storage tank, thereby eliminating inaccuracies in the sensed capacitance of the unit.

REFERENCES:
patent: 2377275 (1945-05-01), Smith
patent: 4467646 (1984-08-01), Berryman et al.
patent: 4594892 (1986-06-01), Asmundsson
patent: 4806847 (1989-02-01), Atherton et al.
patent: 4999900 (1991-03-01), Anderson
patent: 5187979 (1993-02-01), Edmark, III

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