Electromagnetic Flow Meters

A mag meter, or magflow meter, is a flow meter that measures the flow rate based on the electromagnetic induction principle. Based on Faraday’s Law, an electrical conductor moving through a magnetic field produces an internal electric signal. In mag meters, the liquid acts as the conductor. A magnetic field is applied to the metering tube, resulting in a potential difference (voltage). The measured voltage is directly proportional to the liquid’s velocity, runs through the meter and can be measured accurately.

How Do Electromagnetic Flow Meters Work?

1. The electromagnetic coils are energized employing either AC or pulsed DC excitation.
2. The coils generate a magnetic field around the flow tube and perpendicular to the flow.
3. An electrical signal is produced within the conductor (the liquid that is being measured).
4. Two electrodes pick up the signal directly proportional to the flow velocity, the intensity of the magnetic field, and the width of the pipe.

What are the Features & Benefits of Electromagnetic Flow Meters?

• No moving parts.
• Long lasting stability and precision.
• No filter needed.
• Zero maintenance.
• Accurate measure at high flow rate and at low flow rates.
• Bi-directional measure.
• Data logging: Data automatically stored in the internal Eeprom memory. Up to 100,000 lines of active data-logging.
• Multiple outputs: pulse, analog 4-20mA, Modbus, frequency, Hart protocol and programmable output.
• Wider range of measurement.
• Empty pipe detection: Empty pipe electrode supplied as standard (≥ DN65). Empty pipe detection on measuring electrodes standard for all sizes.