Patent ID: 7028558

Claim:
A method for measuring a flow rate of a medium flowing through a measuring tube which is penetrated by a constant magnetic field orthogonal to a flow direction and which an electrical voltage building up in the medium is sensed by electrodes insulated with respect to the medium and located on an outer wall of the measuring tube and in a plane orthogonal to the flow direction of the medium, the measuring tube having an interior area in which the medium is flowing, the measuring tube having an interior area and a position of the electrodes on the outer wall of the measuring tube defining a space therebetween, the steps of the method comprising: a) determining a capacitance of at least one capacitive unit formed by the electrodes and the measuring tube interior area, b) determining a charge change in a static magnetic field created by a change to the at least one capacitive unit by modifying a distance between the electrodes and the measuring tube interior area, and c) establishing a voltage indicative of flow rates.