Electromagnetic flowmeters (EMF), often commonly referred to as ‘mag meters’, have been used for years for continuous flow measurement in industrial applications. They are suitable for liquids with a minimum electrical conductivity of 5 μS/cm. This value indicates the amount of dissolved particles per centimetre in the water. In our flow measurement portfolio, we offer electromagnetic flowmeters in various variants, both as insertion and inline models.
Electromagnetic flow measurement is based on Faraday’s law of electromagnetic induction: when a conductive liquid flows through a magnetic field, it induces a current between the two electrodes, on the basis of which a voltage can be measured. The coils of the electromagnetic flowmeter generate a magnetic field orthogonal to the flow direction; the higher the flow velocity, the greater the induced voltage.
The measured voltage signal is converted into a standard signal by the integrated electronics assembly (e.g. 4–20 mA or in P).
+ Low-maintenance and durable, thanks to the absence of moving parts in the measurement tube
+ Good price-performance ratio, especially for insertion EMFs
+ High stability of the measurements, especially for inline EMFs
+ Low sensitivity to the inlet conditions for full-bore EMFs
We offer two designs of inductive flowmeters.
Properties at a glance
✓ Ultra-precision thanks to the use of the entire flow profile
✓ Nominal diameters up to DN2000 (on request)
✓ Suitable for fluids from a conductivity of 5 μS/cm
Properties at a glance
✓ Ideal for contaminated & aggressive media
✓ Electromagnetic flowmeters with nominal diameters up to DN400
✓ Suitable for fluids with a conductivity of 20 μS/cm or higher
EMF flowmeters are used, for example, as inductive flowmeters for water and waste water in sewage treatment plants or for other contaminated liquids. They are also frequently found in the chemical and pharmaceutical industry, and in food and beverage production, for example for dosing syrups.
The reliability of the measurement results of flowmeters with EMF sensors is influenced by various factors:
