Liquid condition sensing apparatus

Details Liquid condition sensing apparatus Liquid condition sensing apparatus

2006-07-03

2009-10-13

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

Reexamination Certificate

active

07600424

ABSTRACT:
Capacitive liquid condition sensing apparatus includes a pair of a1-1electrode and a1-2electrode arranged to form a first capacitance; a pair of a2-1electrode and a2-2electrode arranged to form a second capacitance; a circuit board formed with a sensing circuit to sense the liquid condition such as a liquid level in accordance with the first and second capacitances; and1-1, 1-2, 2-1and2-2conductive paths connecting the1-1, 1-2, 2-1and2-2electrodes, respectively, to the sensing circuit, and including1-1, 1-2, 2-1and2-2conductive segments, respectively. The1-1, 1-2, 2-1and2-2conductive segments are arranged in a row, and extend side by side. The1-1, 1-2, 2-1and2-2conductive segments are arranged so that a first parasitic capacitance formed between the1-1conductive segment and the1-2conductive segment is equal to a second parasitic capacitance formed between the2-1conductive segment and the2-2conductive segment.

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