Liquid level sensing device and methods of making and operating

Details Liquid level sensing device and methods of making and operating Liquid level sensing device and methods of making and operating

1991-07-12

1992-09-08

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

63207, 340620, 361284, G01F 2326

Patent

active

051448351

ABSTRACT:
A liquid level sensing device for determining the level of a liquid in a liquid confining unit, methods of making and operating the device and a laundry machine using the device are provided, the device comprising a pair of electrode plates disposed in spaced apart relation so as to be adapted to be in a certain position relative to the confining unit and having opposed ends, an electrical circuit connected to the electrode plates for creating a voltage signal therefrom that varies in relation to the level of the liquid in the confining unit relative to the electrode plates, a control for determining the actual level of the liquid from the signal, and a third electrode plate disposed in spaced apart relation to the pair of electrode plates and being adapted to cooperate with one of the pair of electrode plates to provide a reference voltage signal to determine the electrolytic base of the liquid.

REFERENCES:
patent: 3073160 (1963-01-01), Shawhan
patent: 3376746 (1968-04-01), Roberto
patent: 3533286 (1970-10-01), Westcott et al.
patent: 3596517 (1971-08-01), Ryder
patent: 3620080 (1971-11-01), Ryder
patent: 4674324 (1987-06-01), Mulder
patent: 4952914 (1990-08-01), Mueller
patent: 5050431 (1991-09-01), McDonald

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