Magneto-inductive flow measuring device

Abstract

The invention relates to a magneto-inductive flow measuring device (), including: A measuring tube (), through which a medium () flows essentially in a direction of a measuring tube axis (); a magnet arrangement (), which produces a magnetic field (H) passing through the measuring tube () and extending essentially perpendicularly to the measuring tube axis (); a first measuring electrode () and a second measuring electrode (); wherein the measuring electrodes () 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 (H); and an evaluation/control unit (), which ascertains, on the basis of a measurement voltage tapped on the measuring electrodes (), the volume- and/or mass-flow of the medium () through the measuring tube (). In order to increase the measuring accuracy of the multi-parameter flow measuring device (), the first measuring electrode () is made of a first material (A) and the second measuring electrode () is made of a second material (C) different from the first material (A); the control/evaluation unit () ascertains the direct voltage portion (U) of the voltages (U, U) tapped on the two measuring electrodes () relative to a reference potential (Φ), and makes available, on the basis of the direct voltage portion (U), medium-specific information.