Patent ID: 6938635
Filing Date: 2005-09-06
Classification: G01F,Y10T

Abstract:
1. An apparatus for measuring the level of a liquid in a vessel comprising: (a) a first sensor and a second sensor for measuring the pressure of the liquid in the vessel at a first point and a second point, respectively, wherein said first point is located below said second point within the vessel; (b) a first processor for calculating the difference in liquid pressure between said first point and said second point and generating a differential pressure signal therefrom; (c) a sensor for measuring the static head pressure at said first point and generating a static head pressure signal therefrom; (d) a second processor for combining said differential pressure signal and said static head pressure signal to generate a composite output signal; (e) wherein an out-of-range condition for said liquid is created based upon a pre-determined change in said composite output signal.