Patent ID: 7257985

Claim:
A method for automatically controlling the output of a continuous process that requires mixing of a solid or liquid component with a liquid carrier component, the method comprising the steps of: a.) setting a quantitative target for weight-% of one or more solids and/or concentration of one or more liquids to the liquid carrier component; b.) continuously mixing said solids and/or liquids with the liquid carrier component; c.) determining the true density, ρ, by employing equation (14) ρ = 1 V ( 14 ) wherein the gas-free volume of fluid, V, is calculated from the equation V = ( 1 ρ 1 - ( P 2 P 1 - P 2 ) - ( 1 ρ 1 - 1 ρ 2 ) ) wherein the solid/liquid mixture with the liquid carrier component is subjected to two different pressures P 1 , P 2 and wherein the corresponding densities ρ 1 and ρ 2 are measured values; d.) calculating the weight-% of solids and/or the liquid concentration in the mixture from the true density ρ so determined; e.) comparing the calculated weight-% solids or concentration to the target weight-% solids or concentration; and, f.) if the calculated weight-% solids or concentration is greater or less than the target weight-% solids or concentration, lowering or raising the amount of solids or liquids mixed in step b.).