Magnetic Flow Meter is based on Faraday's law of electromagnetism to measure the flow of conductive liquids. This flow meter micro-processor-based processing electronic unit. LCD unit to display flow rate & totalized. Magnetic flow meters work based on faraday's law of electromagnetic induction. According to this principle, when a conductive medium passes through a magnetic field B, a voltage E is generated which is proportional to the velocity V of the medium, the density 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 field. The liquid flowing through the pipe acts as the conductor and this in-duces a voltage that 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 volumetric 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 indicates 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 meter 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 variations in density, viscosity, pressure & temperature.