Abstract: Described herein is an operation-control device adapted for controlling operation of a disperser and including an input unit for receiving, from sensing devices, state-values (V1, V2, V3) of at least two different physical entities and/or operational states of the disperser, such as temperature, pressure, etc. A functional-correlation storage unit is configured to store a functional correlation model including correlations of state-values of subsets of physical entities and/or operational states of the mill and indicative of a predetermined plausibility condition associated to a respective correlation. A plausibility-checking unit is configured to determine a flag to the plausibility condition and to provide a corresponding status signal.

Abstract: Described herein is a pump arrangement for conveying viscous media including a membrane pump having a conveying chamber, a working chamber connectable in a fluid-conducting manner to a source of a pressurized working medium, and a membrane that separates the working chamber from the conveying chamber. A controller valve arrangement is mounted between the working media source and the working chamber, and the membrane is movable back and forth between the working chamber and the conveying chamber by means of actuation of the controller valve arrangement. The pump arrangement has an electronic controller element which is connected in a signal-conducting manner to the controller valve arrangement and is set up to control a compressed air volume in the working chamber by means of actuation of the controller valve arrangement as a function of a flow volume of the medium exiting from the conveying chamber.