If an electrical conductor is moved in a magnetic field which is perpendicular to the direction of motion and to the conductor, an electrical voltage is induced in the conductor whose magnitude is proportional to the magnetic field strength and the velocity of the movement. This characterization of the laws of induction also applies to the movement of a conductive liquid in a pipe through a magnetic field.

Advantages: – Unobstructed flow passage without projecting parts – No moving parts – No additional pressure drop – Essentially flow profile insensitive, only short inlet and outlet sections required – Unaffected by changes in temperature, density, viscosity, concentration and electrical conductivity – Favorable choice of materials for chemically aggressive or abrasive measuring media – Unaffected by contamination and deposits – Especially suitable for hydraulic solids transport – Can be sterilized, CIP tested – Linear relationship between flow rate and measured variable – Operates in both flow directions (forward and reverse) – Measuring range setting can be optimized – Low maintenance, but still easy to maintain – Approved by the Board of Weights and Measures Limitations: – For liquids only – Lower conductivity limit 0.05 μS/cm – Gas inclusions cause errors  
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