Patent ID: 6606905
Filing Date: 2003-08-19
Classification: G01F,G01G

Abstract:
An apparatus for sensing a level of a liquid, the liquid having a density, a liquid base, and a liquid surface, the level being the height of the liquid surface above the liquid base, comprising:at least one base pressure sensor positioned at said base, whereby pressure at said base due to said height of said liquid is determined; at least one external pressure sensor positioned above said liquid surface, whereby pressure external to said liquid surface is determined; a level indicator coupled to said base pressure sensor and said external pressure sensor wherein said level of said liquid is determined from pressure values provided by said at least one base pressure sensor and said at least one external pressure sensor; and at least one intermediate sensor coupled to said level indicator and positioned below said surface at a predetermined height above said at least one base sensor, said level indicator utilizing pressure values provided by said at least one base pressure sensor and said at least one intermediate pressure sensor to determine said density of said liquid.