Abstract: For a reliable determination of through flow, it is currently necessary to work with external measurement devices in the case of flow machines. In particular, in contrast to displacer machines, there is no dependence of the through flow on the speed of rotation. In order to be able to do without an external measurement device, the present invention goes back to the use of pressure sensors, which, in combination with the collection of additional data of the motor or of the conveyed medium, allow a determination of the through flow.

Abstract: A device for sensing the pressure of a medium within a fluid medium received in a container includes a pressure sensor associated with a screen or joined thereto. The screen shields the pressure sensor at least on one side from swirls formed in the medium, for example during filling or emptying of the container. The pressure sensor communicates with an external data-processing unit for evaluation of sensor data and the screen is joined to a pump lance of a container pump in the region of a pump foot and together therewith forms a measuring chamber, in which the pressure sensor is received. The pressure sensor is thereby decoupled by the screen from influences of dynamic pressure and is placed in the container in such a way that it is able to sense the pressure on the spot, but without interfering flow conditions.