Liquid level sensor which prevents liquid absorption

Details Liquid level sensor which prevents liquid absorption Liquid level sensor which prevents liquid absorption

1991-04-29

1992-09-22

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73290R, 338 38, G01F 2324

Patent

active

051487080

ABSTRACT:
A liquid level sensor for detecting a level of an electrolyte where: a pair of resistance films are formed on an insulating substrate: a plurality of electrodes are intermittently mounted on the resistance films in the longitudinal direction; the resistance films are soaked in the electrolyte in the vertical direction along the longitudinal direction; the liquid surface is detected from the variation of the resistance value of the resistance films caused by the short-circuiting of pairs of the electrodes in the electrolyte. The exposed surface of the resistance film is covered by a moisture-resistance film. The result is that undesirable change of resistance value of the resistance film caused by being moistened can be reliably prevented.

REFERENCES:
patent: 3370466 (1968-02-01), Chang
patent: 4169377 (1979-10-01), Scheib
patent: 4637254 (1987-01-01), Dyben et al.
patent: 4827769 (1989-05-01), Riley et al.
patent: 4961064 (1990-10-01), Hara
patent: 5033300 (1991-07-01), Matsuo

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