Importance

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Abstract

An analog conductive liquid level sensor for conductive liquids having three probes. The invention provides an analog output in proportion to the level or volume of the fluid. Triangular shaped probes are closer together at the top than at the bottom with the respective triangular apexes at the bottom resulting in a nearly linear output voltage in accordance with the fluid level. The shape of the probes can be changed to proportion the voltage output to the fluid volume of an irregular shaped container. A driver probe near the bottom of the container provides a constant area exposed to the conductive liquid. This probe provides compensation for the variations in fluid conductivity which could introduce errors in the level indication in the container as found with two probe systems.

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First Claim