Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1995-05-26
1998-02-17
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Thermal type
73304R, 340622, G01F 2322
Patent
active
057193320
ABSTRACT:
A process and a system for operating a level sensor, particularly for measuring amounts of liquid in motor vehicles, employs a plurality of heatable thermistors wherein a number of the thermistors are covered by liquid depending on the level of the liquid, and are cooled below a breakpoint temperature of the thermistors. The total resistance of the thermistors, which may be connected with further resistors, changes discontinuously as a function of the liquid level. At least one thermistor is located above the maximum possible level. The temperature of the thermistors is increased to such an extent by a feeding of electrical heating power that all thermistors which are above the existing level exceed their breakpoint temperatures, whereupon the total resistance is measured.
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Cuchlinski Jr. William A.
Farber Martin A.
Hirshfeld Andrew
VDO Adolf Schindling AG
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