Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1992-05-22
1993-03-30
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Thermal type
338 27, 338307, 338308, 338320, 338260, 68 1205, 68 1221, G01F 2324
Patent
active
051973294
ABSTRACT:
A PTC resistive strip is mounted on a wall of a washer tub. Water in the tub carries away heat from the energized strip thereby reducing its resistance. The water level in the tub is measured by measuring the voltage drop across the strip. The resistance of the strip can be compared to the resistance across a variable resistance or resistor to indicate that the water has reached a desired level. A comparator output can be used to control the water level and washer motor operation via a control circuit which operates the water supply valves and motor switch. A second PTC resistive element is also provided for sensing overfill.
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Cuchlinski Jr. William A.
Gutierrez Diego F. F.
White Consolidated Industries, Inc.
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