Patent ID: 7600414
Filing Date: 2009-10-13
Classification: G01N

Abstract:
1. A method for determining the absolute density of a liquid or slurry that contains entrained air comprising the following steps: a. splitting the liquid or slurry between two parallel densitometers which continuously measure the first and second densities of the liquid or slurry, b. restricting the flow through at least one of the densitometers so that the two densitometers operate at different first and second pressures, c. measuring a first density of a liquid or slurry at a first pressure, d. measuring a second density of the liquid or slurry at a second pressure which is different from the first pressure, and e. calculating absolute density of the liquid or slurry employing the following derived formula that incorporates the polytropic process model of compressibility of gas: absolute density of the liquid or slurry=first density/(1−((first density/second density−1)/((first pressure/second pressure)