The Magic Behind Magnetic Flowmeters

A magnetic flowmeter is also known as a mag flowmeter; it is a volumetric flowmeter that does not have any moving parts which is perfect for water waste applications or almost every kind of dirty liquid that is conductive or water based. It is a device that measures how much fluid travels though pipe; they¡¯re similar to mass flowmeters.

Generally, magnetic flowmeters do not work with hydrocarbons, distilled water, and numerous other non-aqueous solutions, but they are perfect for applications where low pressure drop and low maintenance are necessary. The principle operation of a magnetic flow meter is solely based on Faraday¡¯s Law of Electromagnetic Induction; it states that the voltage induced across any conductor as it moves at right angles through a magnetic field is proportional to the velocity of that conductor.

How Does it Work?

Magnetic flowmeters use Faraday¡¯s Law of Electromagnetic Induction to establish the flow of the liquid in a pipe; a magnetic field is generated and moved into the liquid flowing throughout the pipe. The flow of a conductive liquid into the magnetic field will start a voltage signal to be sensed by electrodes positioned on the flow tube walls, and when the fluid moves faster, additional voltage is generated. Faraday¡¯s Law says that the voltage generated is proportional to the progress of the flowing liquid. The electronic transmitter processes the voltage indicator to establish liquid flow.

How do You Use Magnetic Flowmeters?

Magnetic flowmeters calculate the velocity of conductive liquids in pipes, such as water, acids, caustic, and slurries, and also they can calculate properly when the electrical conductivity of the liquid is higher than approximately 5mS/cm. You should be careful because using magnetic flow meters on liquids with little conductivity, like de-ionized water, boiler feed water, or hydrocarbons, can resolute in flow meter turning off and measuring zero flow. Since this type of flow meter doesn¡¯t block flow it can be applied to clean sanitary, dirty, corrosive, and harsh fluids.

What Are the Cautions for Using Magnetic Flowmeters?

You shouldn¡¯t operate magnetic flow meters near its electrical conductivity limit, because the flow meter can turn off. Also you should provide allowance for altering composition and operating circumstances that can change the electrical conductivity of the liquid. Be sure to size magnetic flowmeters to run higher than velocity at which solids clear up, in order to steer clear of filling the pipe with solids that can influence the measurement and potentially halt flow

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