Liquid level sensing system utilizing a capillary tube
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United States of America Patent
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Issued Date -
Dec 4, 2003
app pub date -
Jun 2, 2003
filing date -
Jun 3, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An upright capillary tube is located at a position in a liquid container such that its lower end can be reached by the surface of the liquid level in the container as the liquid level rises and falls with changes in the amount of liquid in the container. A thermal sensor, e.g., a thermistor is provided on the capillary tube. As the liquid level rises and reaches the lower end of the capillary tube, the liquid rises in the tube due to surface tension. As the liquid in the capillary tube reaches the location of the thermal sensor, the sensor responds to a temperature change to detect the liquid level. The capillary sensing system can be miniaturized and is capable of superior sensitivity.
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