MAGNETOINDUCTIVE FLOWMETER HAVING A PLURALITY OF MEASURING ELECTRODE PAIRS AND DIFFERENT MEASURING TUBE CROSS SECTIONS

摘要

An apparatus for measuring flow of a fluid flowing using the magneto-inductive measuring principle, comprising a measuring tube having at least two subsections, wherein the subsections differ in diameter and/or geometry of cross sectional area; at least one magnet system having at least two coils for producing a magnetic field directed essentially perpendicularly to the flow direction of the fluid; at least two measuring electrode pairs for sensing induced voltage, wherein at least one measuring electrode pair is arranged in a first subsection and a second measuring electrode pair in a second subsection, wherein each measuring electrode pair includes first and second measuring electrodes, which lie opposite one another in the measuring tube and the respective connecting lines of the measuring electrodes are perpendicular to the tube axis and perpendicular to the magnetic field, and an electronics unit for signal registration and/or evaluation and for power supply of the coils, wherein the electronics unit is so embodied that it determines from the induced voltage the flow velocity of the fluid and/or the flow rate of the fluid for at least one subsection.