Liquid level sensor using a non linear rheostat and a float

Details Liquid level sensor using a non linear rheostat and a float Liquid level sensor using a non linear rheostat and a float

2005-07-12

2005-07-12

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Float

C073S29000R

Reexamination Certificate

active

06915691

ABSTRACT:
In a fuel tank level sensor1for measuring a remaining amount of fuel in accordance with a resistance value which is varied by moving a rheostat1autilizing a float1cthat vertically moves according to increase and decrease of the fuel in a fuel tank2, change in resistance value of the rheostat1aincludes a linear range in which the resistance value linearly varies with the increase and decrease of the fuel, and a non-linear range in which the resistance value discontinuously varies under full-tank conditions where the fuel tank is substantially filled up with the fuel. Even upon undesirable increase of the resistance value of the rheostat1aas a result of deposition of sulfides, the sensor1can always detect accurately that the fuel tank2is filled up.

REFERENCES:
patent: 4107998 (1978-08-01), Taylor
patent: 4699003 (1987-10-01), Harde
patent: 4724705 (1988-02-01), Harris
patent: 5074053 (1991-12-01), West
patent: 5138881 (1992-08-01), Riley et al.
patent: 6272911 (2001-08-01), Hinkle

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