LEVEL SENSING CONTROLLER AND METHOD
First Claim
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1. An apparatus for sensing level of a substance in a volume, comprising:
- a first proximity sensor adapted to sense, and output a signal indicative of, the proximity of a substance;
a second proximity sensor adapted to sense, and output a signal indicative of, the proximity of said substance, said second proximity sensor spaced apart from said first proximity sensor;
a control circuit coupled to and adapted to receive said signals from said first proximity sensor and said second proximity sensor;
said control circuit further adapted to output at least one control signal, said at least one control signal indicative of whether both of said first and second proximity sensors sense the proximity of said substance or neither of said first and second proximity sensors sense the proximity of said substance.
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Abstract
An apparatus for controlling a pump or other device includes first and second proximity sensors adapted to sense level of a fluid or powder in a vessel and a control circuit adapted to receive and process the sensor outputs and output one or more control signals to control a controlled device. The first and second sensor locations can be interchanged without affecting performance of the apparatus.
160 Citations
32 Claims
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1. An apparatus for sensing level of a substance in a volume, comprising:
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a first proximity sensor adapted to sense, and output a signal indicative of, the proximity of a substance; a second proximity sensor adapted to sense, and output a signal indicative of, the proximity of said substance, said second proximity sensor spaced apart from said first proximity sensor; a control circuit coupled to and adapted to receive said signals from said first proximity sensor and said second proximity sensor; said control circuit further adapted to output at least one control signal, said at least one control signal indicative of whether both of said first and second proximity sensors sense the proximity of said substance or neither of said first and second proximity sensors sense the proximity of said substance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification