Liquid level sensor

Details Liquid level sensor Liquid level sensor

2005-12-06

2005-12-06

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S623000, C340S624000, C073S30400R, C073S305000, C073S317000

Reexamination Certificate

active

06972685

ABSTRACT:
A liquid level detecting apparatus resistant to the deterioration and corrosion thereof is provided while holding down an increase in the manufacturing cost thereof. This apparatus1has fixed electrodes3on which a sliding contact point5is slidingly moved in accordance with a fluctuation of a float, and a first resistor4connected to the fixed electrodes3, the fixed electrodes3being made of at least silver (Ag), palladium (Pd) and a glass component, a weight ratio of the silver (Ag) to palladium (Pd) being not lower than 75 wt. % to not higher than 25 wt. %, a sliding portion7of the fixed electrodes3on which the sliding contact point5is slidingly moved being covered with second resistors8a resistance value of which is lower than that of the first resistor4.

REFERENCES:
patent: 6571627 (2003-06-01), Yasuda et al.
patent: 54-157663 (1979-12-01), None
patent: 59-93102 (1984-06-01), None
patent: 63-1001 (1988-01-01), None
patent: 4-1682 (1992-01-01), None
patent: 6-40821 (1994-05-01), None

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