Magnetic Flow Meter Working Principle

Magnetic flowmeters can measure properly when the electrical conductivity of the liquid is greater than approximately 5μs cm.

Magnetic flow meter working principle.

The physical principle at work is electromagnetic induction and mathematically defined as e k b d v. 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. The induced voltage e is directly proportional to the velocity v of the fluid moving through the magnetic field b. Magnetic flow meters works based on faraday s law of electromagnetic induction.

These meters are also called as magflow or electromagnetic flow meters. 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. 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 induced voltage is carried to the transmitter through the electrode circuit. 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. 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.