Magnetic Flow Meter is based on Faraday's law of electromagnetism to measure the flow of conductive liq-uids. This flow meter micro-processor based processing electronic unit. LCD unit to display flow rate & total-ized.
Magnetic flow meters works based on faraday's law of electromag-netic induction. According to this principle, when a conductive medium passes through a magnetic field B, a voltage E is generat-ed which is proportional to the velocity V of the medium, the den-sity of the magnetic field and the length of the conductor.
In a magnetic flow meter, a current is applied to wire coils mounted within or outside the meter body to generate a magnetic fields. The liquid flowing through the pipe acts as the conductor and this in-duces a voltage which is proportional to the average flow velocity. . This voltage is detected by sensing electrodes mounted in the mag-flow meter body and sent to a transmitter which calculates the vol-umetric flow rate based in the pipe dimensions.
To apply this principle to flow measurement with a magnetic flow meter, it is necessary first to state that the fluid being measured must be electrically conductive for the Faraday principle to apply. As applied to the design of magnetic flow meters, Faraday's Law in-dicates that signal voltage (E) is dependent on the average liquid velocity (V) the magnetic field strength (B) and the length of the conductor (D) (which in this instance is the distance between the electrodes)
The Obstruction to the flow is almost nil and therefore this type of meters can be used for measuring suspensions, including mud, sewage, pulp, etc. They are not very much affected by upstream flow disturbances. These meters can be used as bidirectional meters. They are practically unaffected by variation in density, viscosity, pressure & temperature.