Patent ID: 7571646
Filing Date: 2009-08-11
Classification: G01F

Abstract:
1. A fluid level sensor comprising: a tube constructed of a pliable, non-conductive material; said tube having a hollow core with an inside wall; a first and a second conductive wire each having a sheath of conductive material; said sheaths forming a space between the tube and themselves, wherein the space is filled with an insulator; said first and second conductive wires mounted opposite each other on opposing sides of the inside wall; and wherein a fluid in the hollow core provides a current path between the first and second wires, via the sheaths of conductive material the first and the second wires thereby enabling a voltmeter measuring module connected across the first and second wires to calculate a height of the fluid in the hollow core; wherein the voltmeter measuring module further comprises a processor which uses the formula (voltage across the first and second conductive wires)=(current)(resistance across the hollow portion of the tube having no fluid therein), and wherein the voltage is calibrated to yield the height of the fluid in the tube.