Patent attributes
An apparatus for measuring flow of a medium through a measuring tube directed along a longitudinal axis of the measuring tube. The apparatus includes: A magnet arrangement, which produces an alternating magnetic field (φ1, φ2) at two locations, wherein, at the first location, the magnetic field passes through the measuring tube transversely to the longitudinal axis of the measuring tube, wherein, associated with the measuring tube, is at least one measuring electrode, in which a measuring current dependent on the flow of the medium is induced, wherein the magnetic field is so developed at the second location, that it drives an electric motor; and at least one control/evaluation unit, which so controls the magnet arrangement, that, in each case, a magnetic field suited for operating the electric motor and the flow measuring arrangement is provided, and wherein the control/evaluation unit delivers, on the basis of the measuring voltage induced in the measuring electrode(s), information concerning the volume flow of the medium in the measuring tube.
