An electromagnetic flow meter, also known as a mag meter, is a type of volumetric flowmeter that operates under the flow principle of Faraday’s law of electromagnetic induction. Electromagnetic flow meters are composed of two main components that work together to measure the flow of a fluid as it travels through a pipe: a sensor and a transmitter. The sensor on an electromagnetic flow meter is situated inside the pipe and measures the induced voltage that is generated by the fluid traveling through said pipe, while the transmitter converts this induced voltage into a flow measurement and transmits it to a control system. Electromagnetic flow meters are used in a wide variety of applications, including those in the water & wastewater, food & beverage, chemical, oil & gas, pulp & paper, pharmaceutical, and healthcare industries. Electromagnetic flow meters do not cause any obstructions in the pipe and are able to detect liquids that include contaminants like solids & air bubbles, making them ideal for measuring the flow of sanitary liquids and more! The downside of electromagnetic flow meters is that they require at least one section of short pipe and they can’t detect gasses and liquids without electrical conductivity.


What Is Faraday’s Law of Induction?

Faraday’s law of induction states that the induced voltage (E) generated by the flow of conductive liquids inside of a magnetic field is directly proportional to the pipe inner diameter (D), magnetic field strength (B), and average flow velocity (V). The magnetic field strength (B) and the pipe inner diameter (D) are fixed values, so they can be combined into a calibration factor (K), resulting in an equation of E = K*V


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