Conductive sensor for fluid level sensing
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United States of America Patent
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Issued Date -
May 12, 2005
app pub date -
Nov 12, 2004
filing date -
Nov 12, 2003
priority date (Note) -
Abandoned
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Abstract
The invention relates to a device for sensing fluid level comprising a calibration sensor completely immersed in a fluid, and a measurement sensor at least partially immersed in the same fluid, wherein said calibration sensor is disposed in the fluid at a position lower than the lowest level of the measurement sensor. The calibration sensor and measurement sensors comprise elongated apertures in a printed circuit board with electrically conductive plating formed on each side of, and spanning the length of, the elongated apertures. Further, the invention relates to a method for determining a fluid level within a reservoir comprising: providing a calibration sensor completely immersed in the fluid and having a known length, providing a measurement sensor at least partially immersed in the fluid, sensing an electrical property of the fluid through the calibration sensor, sensing the same electrical property of the fluid through the measurement sensor, and determining the fluid level as it relates to the length of the measurement electrode exposed to the fluid.
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