Patent ID: 8237454

Claim:
A measuring device for local measurement of an electrical resistance and a capacitance of a content of a container, comprising: at least three electrodes disposed adjacently of each other in a direction with a vertical component and electrically insulated from each other, wherein each of the electrodes is adapted to be connected to an electrical measuring circuit for measuring, via one of the at least three electrodes and at least one other of the at least three electrodes which is connected to an electrical earth, the electrical resistance and the capacitance of the content of the container in the vicinity of the electrode connected to the measuring device and the electrical earth, wherein the electrical measuring circuit is adapted for measuring the electrical resistance and for measuring the capacitance; the electrical measuring circuit is adapted to generate at least one electric measuring signal representing the measured electrical resistance or the capacitance; a control unit for connecting at least one of the at least three electrodes to the electrical measuring circuit, wherein the control unit is adapted to insulate other remaining electrodes from the electrical measuring circuit and the electrical earth, and the electrical measuring circuit comprises a number of sub-measuring circuits, each connected to one of the electrodes by means of a controllable connection, and that the sub-measuring circuits are each positioned in the vicinity of the electrode to which they are connectable.