Patent ID: 6536276
Filing Date: 2003-03-25
Classification: G01F

Abstract:
A liquid level sensor for a container having a wall surrounding a chamber containing a liquid, a heat source on said wall at a first location, a first temperature sensitive element mounted on the wall adjacent to the heat source, a second temperature sensitive element mounted on the wall at a location spaced from the first temperature sensitive element a sufficient distance such that the heat from the heat source has a lesser effect at the location of the second temperature sensitive element than at the location of the first temperature sensitive element, wherein the he at source and the first and second temperature sensitive elements, comprise a level indicator set and wherein there are a plurality of level indicator set elements mounted on the tank at vertically spaced locations, and circuits coupled to the first and second temperature sensitive elements of each level indicator set for determining and providing an output indicating the temperature differential between the first and second temperature sensitive elements of the respective level indicator set.