Patent ID: 7946184

Claim:
An apparatus for measuring flow a medium flowing through a measuring tube in the direction of a measuring tube axis, comprising: a magnet arrangement producing an alternating magnetic field passing through the measuring tube essentially perpendicularly to the measuring tube axis; two measuring electrodes, which are positioned in the measuring tube on a connecting line which is directed essentially perpendicularly to the measuring tube axis and to the magnetic field; a temperature measuring unit, which makes available information concerning temperature of the medium; an evaluation/control unit, which delivers information concerning volume- or mass-flow of the medium in the measuring tube on the basis of a measurement voltage induced in the measuring electrodes and which determines electrical conductivity of the medium on the basis of impedance measured between electrodes, wherein: said control/evaluation unit ascertains a correction value for the electrical conductivity on the basis of the measured temperature and makes available a correspondingly corrected value for the electrical conductivity, said temperature measuring unit is provided in the realm of the magnet arrangement; and said temperature measuring unit ascertains temperature of the medium indirectly by measuring coil current flowing through the magnet arrangement.