Patent ID: 6935173

Claim:
A liquid level sensor comprising: a housing having circuitry provided on a printed circuit board positioned in the housing by locating members which cooperate with openings of the printed circuit board, wherein the printed circuit board is retained in the housing by screws which make electical engagement with the circuit board, an inner tube extending from the housing, and an outer tube extending from the housing, the inner tube being positioned within a hollow center of the outer tube to form a coaxial configuration, a slot provided in the outer tube, the slot extending through the wall of the outer tube into the hollow center of the outer tube, the slot extending essentially the entire length of the outer tube, the circuitry, outer tube, and inner tube form a capacitive circuit to measure liquid, whereby the slot allows the liquid to flow more easily into the hollow center of the outer tube and between the inner tube and outer tube to allow the sensor to provide accurate measurements with many types of fluids.