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MAG METER THEORY

Technical information

Electromagnetic fiowmeters measure the volume flow of electrically conductive liquids and slurries.

Measuring principle

An electric conductor, in this case the electrically conductive medium, passes through a magnetic field. The voltage U induced in this medium is directly proportional to the mean flow velocity V. Magnetic induction B (magnetic field strength) and the distance between electrodes D (nominal pipe diameter) are constant.

The induced voltage signal is picked up either by two measuring electrodes in conductive contact with the medium or indirectly by capacitive coupling. A signal converter amplifies the signal (1) and converts it into a standard analog signal (e.g. 4 to 20 mA) and a frequency signal (e.g. 1 pulse for every US gallon or cubic meter of medium flowing through the measuring tube).

To ensure that the voltage is not short-circuited by the pipe wall, the measuring tube is made of an electrically insulating material or fitted with an insulating liner.

Measurement is largely independent of the flow profile and other properties of the medium, such as pressure, temperature, viscosity, density, consistency, electrical conductivity, and electrode contamination.

Measuring systems

The electromagnetic flowmeter consists of a primary head, that is installed in the pipeline, and a signal converter.

The compact design has the signal converter mounted directly on the primary head.

For systems with pulsed d.c. field the primary head field coil~ which generate the magnetic field are energized by a pulsed direct current from the signal converter. The measuring signal is a squarewave

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