Elektromagnetischer Strömungsmesser

An electromechanical flowmeter includes a coil arrangement located completely outside the fluid conduit for producing a magnetic field that extends concentrically about the longitudinal axis of the conduit, the portion of the field adjacent the inner periphery of the conduit being stronger than that adjacent the center of the conduit. First electrodes are mounted on the interior wall surface of the conduit within the magnetic field, and second electrodes are arranged at a location generally unaffected by the field. In the preferred embodiment, the second electrode is mounted on the interior wall surface outside the magnetic field in longitudinally-spaced relation relative to the first electrodes, whereby the provision of any flow-obstructing electrode within the conduit is completely avoided. In a non-preferred embodiment, the second electrode is mounted centrally with the conduit relative to the longitudinal axis thereof. The field is produced by a pair of magnetic field generators-such as toroidal windings or squirrel cage windings-arranged with their magnetic axes extending circumferentially in the same direction relative to the conduit.