Magnetoinductive flowmeter with galvanic measurement electrodes having a head section of a noble material

Abstract

A magnetoinductive flowmeter having a measurement tube (), through which a flowable medium () flows, with a magnet unit () which is arranged on the outside of the measurement tube () and produces a magnetic field which is oriented substantially perpendicular to the direction of flow of the flowable medium (), with at least two measurement electrodes () which are inserted opposite one another in the wall of the measurement tube () such that they are electrically insulated being provided for detecting the measurement voltage which is induced through the flowable medium () in the magnetic field and each coming into contact with the flowable medium () by means of at least one end face (), so that the measurement electrodes () operate in the manner of galvanic electrodes, wherein each measurement electrode () is designed in a divided manner and comprises a head section () which is composed of a noble, low-corrosion material and also a shaft section () which is composed of a base, electrically conductive material, with the measurement electrode () making contact with the flowable medium () by means of the head section () and being mechanically fixed in the measurement tube () and/or electrically connected to the outside by means of the shaft section ().