Patent ID: 8051722

Claim:
An apparatus for measuring volume- or mass-flow of a medium in a pipeline, comprising: a measuring tube, through which the medium flows in the direction of the longitudinal axis of said measuring tube; a magnet system, which is embodied in such a manner, that it produces a magnetic field passing through said measuring tube and extending essentially transversely to the longitudinal axis of said measuring tube; at least one measuring electrode coupling with the medium and arranged in a bore in the wall of said measuring tube in a region lying essentially perpendicular to the magnetic field. Said measuring electrode has an elongated electrode shaft having, coupling with the medium, a first, widened, end region, which is so dimensioned, that its diameter is larger than the diameter of said bore in the wall of said measuring tube, in which said at least one measuring electrode is placed; and a control/evaluation unit, which, on the basis of a measurement voltage induced in said at least one measuring electrode, delivers information concerning volume- or mass-flow of the medium in said measuring tube, wherein: in an opposing, second, end region of said electrode shaft of said measuring electrode, at least one radial recess or at least one radial protrusion is arranged; and a binding element is provided, which is so embodied, that it fixes said measuring electrode in said bore of said measuring tube in the axial direction by engaging with said at least one radial recess or protrusion.