mag flow meter working principle

sales01@cxflowmeter.com

The working principle of magnetic flow meter is based on Faraday's law of electromagnetic induction.

In the mag flow meter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the 

Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive

 medium flows through it, an induced voltage will be generated (the working principle is shown in the figure below). Two electrodes

 inside the pipe measure the induced voltage produced. The measuring pipe is electromagnetically isolated from the fluid and 

measuring electrodes by a non-conductive lining (rubber, Teflon, etc.).

When a conductor cuts a magnetic wire in a magnetic field, an induced electric potential is created in the conductor. The effective 

length of the conductor in the induced electric field is proportional to the vertical motion speed of the conductor in the magnetic

 field. Similarly, when the conductive fluid flows vertically in the magnetic field and cuts the magnetic induction force lines, an induced

 electric potential will also be generated on the electrodes on both sides of the pipe.

The overall structure of the electromagnetic flowmeter is simple and reliable, with no moving parts, long service life, no intercepting

 and blocking parts, no pressure loss and fluid blockage. It can be used for automatic detection, adjustment and program control

 systems. It has no mechanical inertia, fast response and good stability. The measurement accuracy is not affected by physical parameters, 

such as temperature, viscosity, and density.

The electromagnetic flowmeter has no moving parts and no flow-blocking parts, which will not cause pressure loss, nor will it cause 

problems such as wear and blockage. The measurement range of electromagnetic flowmeter can reach 1 to 100. In addition, the

 electromagnetic flowmeter is only proportional to the average flow rate of the measured medium and has nothing to do with the

 axisymmetric flow state (laminar flow or turbulent flow).

At the same time, the electromagnetic flowmeter also has a bidirectional measurement system. The straight pipe section required by

 the sensor is shorter, the pipe diameter is 5 times, and the pressure loss is small. The measurement is not affected by changes in fluid 

density, viscosity, temperature, pressure and conductivity and is mainly used in wastewater treatment.

The electromagnetic flowmeter is a volume flow measurement instrument that is not affected by temperature, viscosity, density and 

conductivity (within a certain range). Therefore, electromagnetic flowmeters can be used to measure the flow of other conductive 

liquids without additional corrections.

Electromagnetic flow meters cannot currently be used to measure liquid media with very low conductivity. The conductivity of the 

liquid medium to be measured must not be less than 10-5 (S/cm), which is equivalent to the conductivity of distilled water. Due to 

temperature limitations, industrial electromagnetic Flowmeters cannot measure high-temperature and high-pressure fluids, and 

electromagnetic flowmeters are easily affected by external electromagnetic interference.

If you want to know more about mag flowmeter-related issues, such as what kind of electromagnetic flow meter is 

suitable for your site, price and installation, etc., you are welcome to consult: sales01@cxflowmeter.com