In 1952, the Dutch company Tobi-Meter introduced the first commercial Magnetic Flow Meter. Since then, these flow meters have been continuously refined to become one of the most popular choices for measuring the flow of water and water-based products. Their popularity has a lot to do with their non-invasive nature, ease of installation, high accuracy, reliability and affordability. Here is an overview of the advantages and applications of a magnetic flow meter.

How Magnetic Flow Measurement Works

Electromagnetic flow meters (or magmeters) are a type of velocity or volumetric flow meter that operate according to Faraday’s law of electromagnetic induction – which states that a voltage will be induced when a conductor moves through a magnetic field. Therefore one limitation is that Magmeters can only detect the flow rate of conductive fluid. 

Faraday’s Law In Magnetic Flow Meter Use

According to Faraday’s law, when the conductive fluid flows through a magnetic field of the sensor, an electromotive force proportional to the volume flow is generated between the pair of electrodes, which is perpendicular to the flow direction and the magnetic field. The amplitude of the electromotive force can be expressed as:

Where E is the induced electric potential, k is a constant, B is the magnetic flux density, D is the inner diameter of the measuring tube, and v is the average velocity of the fluid in the axial direction of the electrode cross-section inside the measuring tube.

Take a look at this short video to learn more about the measuring principle.

Applications For Magnetic Flow Meters

Magnetic flow meters are found in practically every industry. For example, they are used in water treatment plants to measure treated and untreated sewage, process water, water, and chemicals. Mining and mineral process industry applications include process water and process slurry flows and heavy media flows.

They can also be put to use in applications involving sterile and hygienic processes and measurements (Pharmaceutical and Food & Beverage) as well as for extremely corrosive or abrasive solutions.

Advancements in Magnetic Flowmeter Technology

Although this measuring principle has been in operation for 70 years, there are still new developments in magflow technology, ensuring they are even more accurate and easier to install.

Take a look at this short video,

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