Magnetic flow meter: Difference between revisions
imported>Rbrwr Adding local short description: "Device for measuring flow of a fluid", overriding Wikidata description "Used to measure the flow of water" |
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[[File:Dibujo MID Aufbau.PNG|thumb|Electromagnetic flow meter]] | [[File:Dibujo MID Aufbau.PNG|thumb|Electromagnetic flow meter]] | ||
[[File:Расходомер электромагнитный.jpg|thumb|Electromagnetic flow meter]] | [[File:Расходомер электромагнитный.jpg|thumb|Electromagnetic flow meter]] | ||
A ''magnetic flow meter'' ('''mag meter''', '''electromagnetic flow meter''') is a transducer that measures fluid flow by the voltage induced across the liquid by its flow through a magnetic field. A magnetic field is applied to the metering tube, which results in a potential difference proportional to the flow velocity perpendicular to the flux lines. The physical principle at work is [[electromagnetic induction]]. The magnetic flow meter requires a conducting fluid, for example, water that contains ions, and an electrical insulating pipe surface, for example, a rubber-lined steel tube. | A ''magnetic flow meter'' ('''mag meter''', '''electromagnetic flow meter''') is a transducer that measures fluid flow by the voltage induced across the liquid by its flow through a magnetic field. A magnetic field is applied to the metering tube, which results in a potential difference proportional to the [[flow velocity]] perpendicular to the flux lines. The physical principle at work is [[electromagnetic induction]]. The magnetic flow meter requires a conducting fluid, for example, water that contains ions, and an electrical insulating pipe surface, for example, a rubber-lined steel tube. | ||
If the magnetic field direction were constant, [[electrochemistry|electrochemical]] and other effects at the electrodes would make the potential difference | If the magnetic field direction were constant, [[electrochemistry|electrochemical]] and other effects at the electrodes would make the potential difference | ||
difficult to distinguish from the fluid flow induced potential difference. To show this in modern magnetic flowmeters, the magnetic field is constantly reversed, cancelling out the electrochemical potential difference, which does not change direction with the magnetic field. This however prevents the use of permanent magnets for magnetic flowmeters. | difficult to distinguish from the fluid flow induced potential difference. To show this in modern magnetic flowmeters, the magnetic field is constantly reversed, cancelling out the [[electrochemical potential]] difference, which does not change direction with the magnetic field. This however prevents the use of permanent magnets for magnetic flowmeters. | ||
==See also== | ==See also== | ||
Latest revision as of 15:24, 23 June 2025
A magnetic flow meter (mag meter, electromagnetic flow meter) is a transducer that measures fluid flow by the voltage induced across the liquid by its flow through a magnetic field. A magnetic field is applied to the metering tube, which results in a potential difference proportional to the flow velocity perpendicular to the flux lines. The physical principle at work is electromagnetic induction. The magnetic flow meter requires a conducting fluid, for example, water that contains ions, and an electrical insulating pipe surface, for example, a rubber-lined steel tube.
If the magnetic field direction were constant, electrochemical and other effects at the electrodes would make the potential difference difficult to distinguish from the fluid flow induced potential difference. To show this in modern magnetic flowmeters, the magnetic field is constantly reversed, cancelling out the electrochemical potential difference, which does not change direction with the magnetic field. This however prevents the use of permanent magnets for magnetic flowmeters.