Electromagnetic Flow Meters

Magnetic Flow Meters, often called Magflow Meters or magmeters for short, and more formally known as Electromagnetic Flow Meters, measure flow based on the potential difference generated by the fluid’s movement within the instrument’s metering tube. This method is highly accurate and reliable, even under fluctuating process conditions, making the Magnetic Flow Meter an ideal solution for most applications where the fluid has sufficient conductivity.

Principle of Operation:

The Magnetic Flow Meter operates on the principle of electromagnetic induction. According to Faraday’s law, when a conductor moves through a magnetic field, an electrical voltage is induced. The induced voltage is calculated using the following equation:

U = B x D x v
U – induced voltage
v – the average flow velocity vector
D – diameter of the pipe
B – magnetic flux density

When the magnetic flux density (B) and pipe diameter (D) remain constant, the induced voltage is directly proportional to the average flow velocity. The fluid flows perpendicularly through the flowmeter’s magnetic field. The induced electrical voltage is detected by two electrodes positioned at right angles to both the magnetic field and the flow direction. This voltage is generated as the electrically conductive fluid passes through. A rectangular-wave current is generated by the converter, which then powers the spool coils of the measuring sensor, creating the flowmeter’s magnetic field. The power supply ensures continuous excitation of the coils, maintaining stable operation of the flowmeter under all working conditions.