Liquid sensor using temperature compensation
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United States of America Patent
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Nov 22, 2016
Grant Date -
Mar 17, 2016
app pub date -
Nov 30, 2015
filing date -
Sep 13, 2011
priority date (Note) -
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Abstract
A liquid sensor system can detect whether liquid is present at a location within a tank or other container, such as an aircraft fuel tank. The system can include a sensor that has a heated negative temperature coefficient (NTC) element and a temperature compensator element. The sensor may be located within the tank. The elements can be polarized by voltages from separate voltage sources. The voltages can be compared to detect a presence or level of liquid within the tank. Only two wires may be needed to connect the sensor with components outside the tank. The system may be able to detect liquid using less than twenty five milliamps and a sensor temperature that is less than two hundred degrees Celsius.
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