Magnetic-inductive flow metering technology
Measurement principle - Magnetic-inductive flow meters
The principle of magnetic-inductive flow metering is based on electromagnetic induction – defined in Faraday’s law. By producing a magnetic field B, the sensor generates an electrical current Ui, which is directly proportional to the flow speed V prevalent in the pipeline.
This electrical voltage is absorbed, processed and converted to digital output variables by a measuring transducer (mag-flux M1).
Structure of a magnetic-inductive flow meter
A complete flow meter consists of a mag-flux M1 measuring transducer for synchronised d.c. fields and a corresponding sensor (flow sensor). All mag-flux product family MID are available as synchronised d.c. field systems (DC) and are extremely robust and resistant to interference in operation, as there are no moving parts. The special design also avoids pressure losses due to the measurement technology. For individual custom solutions, we recommend using a.c. field devices.
The sensors, when combined with our measuring transducer mag-flux M1 can achieve a measurement accuracy of more than ±0.5% via precise wet calibration of the devices.
Product versions of our magnetic-inductive flow meter:
- Fully welded steel fitting (flange, threaded and groove version) – mag-flux A
- Custom designs (pressure, media properties, percentage of solids, particle type, temperature and length)
Advantages of our magnetic-inductive flow meter (MID):
- The measurement principle does not depend on pressure, density, temperature and viscosity
- No moving parts = No wear
- Pressure losses are avoided via the special design
- Analogue output signal
- Also suitable for aggressive and corrosive media
- Reliability (long-term stability, service life)
- Minimum maintenance requirements
- Simple interpretation of measurement values
- Easy commissioning
- High measurement accuracy
- Wide range of cladding materials for drinking water, waste water, chemicals and solids
- Abrasion and corrosion-resistant claddings available
Measurement tasks and measurable media:
The measurement tasks primarily include recording and assessing continuous flows of liquid media with a flow speed of up to 10 m/s (32.8 ft/s) and a minimum conductivity of 20 µS/cm for d.c. field devices and 3 µS/cm for a.c. field devices.
In general, our magnetic-inductive flow meters (MID) can be used for conductive liquids and liquid/solid mixes (20 and 3 µS/cm) such as: water, pulps, pastes, slurries, acids, solvents, lyes, sap, emulsions, ore slurries, sand or water mixes.
Our measuring devices are used in the following industries worldwide:
- Plant and mechanical engineering
- Fire safety
- Building services equipment
- Metal extraction, production and processing
- Paper and pulp
- Oil and gas
- Water and wastewater
- Cement and minerals