Abstract: In a method and apparatus for eliminating liquid components and fine-grained components from a sugar suspension, control variables for controlling the centrifuge are obtained from a measurement of the quantity of material per unit of surface area in the filter cake formed in the centrifuge during the centrifuging process. In particular, a radiometric measurement can be used for this purpose. From the time course of the measurements obtained, relationships with the physical composition of the filter cake at the instant of measurement are derived and used to adjust process control variables, such as the quantity of water to be added and the length of the washing phase. The control of such a process can be made fully automatic, with optical quality, using a single continuous measurement.

Abstract: In a method for regulating the foam density in products foamed from liquid and a gas additive the density of the foam and the excess pressure are simultaneously measured in the conveyor line of the foam, correlated in an evaluation circuit and the free foam density, that is, the density of the released foam under atmospheric pressure, is calculated therefrom. This calculated value is compared with a set value of the free foam density and in the case of deviations the ratio of the amounts of liquid and gas conveyed is varied.This method makes it possible for the relative fluctuation in density of the released foam to be reduced to values on the order of 1%.