Liquid level sensing device and methods of making an operating t

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

1990-09-12

1991-09-24

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

63207, 340 20, 361284, G01F 2326

Patent

active

050504312

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: 2691223 (1954-10-01), Oberlin
patent: 2873757 (1959-02-01), Lindemann
patent: 3073160 (1963-01-01), Shawhan
patent: 3249712 (1966-05-01), Rhodes et al.
patent: 3376746 (1968-04-01), Roberts
patent: 3580074 (1971-05-01), Westcott
patent: 3596517 (1971-08-01), Ryder
patent: 3728897 (1973-04-01), Wallman
patent: 3774237 (1973-11-01), Hardway, Jr.
patent: 4303406 (1981-12-01), Ross

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