Magnetic Flow Meter Working Principle

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.

Magnetic flow meter working principle.

The physical principle at work is electromagnetic induction. Be careful because using magnetic flowmeters on fluids with low conductivity such as deionized water boiler feed water or hydrocarbons can cause the flowmeter to turn off and measure zero flow. 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. Magnetic flowmeters can measure properly when the electrical conductivity of the liquid is greater than approximately 5μs cm.

These meters are also called as magflow or electromagnetic flow meters. What is the working principle of magnetic flow meter. Faraday s law the operation of a electromagnetic flowmeter is based upon faraday s law which 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. The flow principle behind magnetic flow meters is known as faraday s law mathematically defined as e k b d v.

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. Principle of magnetic flow meter based on faraday s law. The induced voltage is carried to the transmitter through the electrode circuit.