Fluid level detector using thermoresistive sensor

Details Fluid level detector using thermoresistive sensor Fluid level detector using thermoresistive sensor

1999-01-18

2000-08-08

Williams, Hezron

Measuring and testing

Liquid level or depth gauge

Thermal type

73290R, G01F 2324, G01F 2322

Patent

active

060984570

ABSTRACT:
A fluid level detector according to the invention comprises a substrate formed of a heat-insulative material and one or more thermoresistive sensor elements located on the substrate that is adapted to be immersed in a fluid. A current source is connected to the sensor element for producing a current through the sensor element during a predetermined time period. The current heats the sensor element and causes a change in voltage across the sensor element at least during the time period. The amount of change in voltage during the time period is reflective of the fluid level, since the fluid serves as a heat sink for the sensor element. The voltage is measured across the sensor element and a voltage slope is determined. The determined voltage slope is indicative of fluid level.

REFERENCES:
patent: 2468676 (1949-04-01), Liben
patent: 3111031 (1963-11-01), Kuritza
patent: 3600946 (1971-08-01), Ziemba
patent: 4567762 (1986-02-01), Hoppert et al.
patent: 4805454 (1989-02-01), LeVert
patent: 5111692 (1992-05-01), McQueen et al.
patent: 5197329 (1993-03-01), Grundy
patent: 5210769 (1993-05-01), Seidel et al.
patent: 5228340 (1993-07-01), Kataoka et al.
patent: 5493100 (1996-02-01), Renger
patent: 5685194 (1997-11-01), McCulloch et al.

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