Liquid level detection apparatus

Details Liquid level detection apparatus Liquid level detection apparatus

2006-10-03

2006-10-03

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

Reexamination Certificate

active

07114391

ABSTRACT:
There is provided a liquid level detection apparatus for detecting the level of a liquid, including a pair of first electrodes, a pair of second electrodes arranged at a different height to that of the first electrodes, a pair of electrode leads having respective ends connected with the first electrodes and sandwiching therebetween the second electrodes, a grounding unit that changes, between a current-carrying state and an open state, a second electrode current bypass from the second electrodes to a ground line, a first electrode capacitance measurement unit that measures a first electrode capacitance between the first electrodes, with the second electrode current bypass set in the current-carrying state to establish a connection from the second electrodes to the ground line, and a level determination unit that determines the liquid level based on the first electrode capacitance between the first electrodes and a second electrode capacitance between the second electrodes.

REFERENCES:
patent: 3755804 (1973-08-01), Johnson
patent: 4806847 (1989-02-01), Atherton et al.
patent: 4820973 (1989-04-01), Alvarez
patent: 6564630 (2003-05-01), Klemp
patent: 7021122 (2006-04-01), Rosemberg et al.
patent: 196 44 777 (1998-06-01), None
patent: 63-079016 (1988-04-01), None
patent: 2003-110364 (2003-04-01), None
patent: WO 01/79789 (2001-10-01), None

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