Difference between vortex flowmeter and electromagnetic flowmeter?

　　Vortex flowmeter based on the Kamen vortex principle, applicable to liquid and gas media; electromagnetic flowmeter based on Faraday's law, applicable to conductive liquids. There are differences between the two in terms of accuracy, stability and application scenarios, which need to be considered according to the measurement requirements.

　　Vortex flowmeter and electromagnetic flowmeter are two common flow measurement equipment, they work in the principle, applicable media, performance characteristics and application scenarios, there are significant differences. The following is a specific comparison of these two types of flow meters:

　　I. Working Principle

　　Vortex flowmeter: based on the ‘Carmen vortex’ principle, that is, when the fluid around a non-streamlined object, it will form a series of asymmetric vortex columns in its downstream. The frequency of these vortices is directly proportional to the flow rate of the fluid, so you can measure the frequency of the vortex to calculate the flow rate of the fluid.

　　Electromagnetic flowmeter: based on Faraday's law of electromagnetic induction, through the measurement of conductive liquid in the magnetic field cutting the magnetic lines of force generated by the induced electromotive force to determine the flow of the fluid. The size of the induced electromotive force is proportional to the flow rate of the fluid, magnetic flux density and measuring tube diameter.

　　Second, the applicable media

　　Vortex flowmeter: for liquid or gas media, but the temperature, pressure, viscosity of the medium has certain requirements. It is not suitable for measuring viscous liquids, granular solid media and liquids containing foam and bubbles.

　　Electromagnetic flowmeter: mainly for high conductivity of the liquid medium, such as water, sewage, acid and alkali solutions. The conductivity of the medium requires high, can not measure non-conductive media.

　　Third, the performance characteristics

　　Vortex flowmeter:

　　Relatively low precision and stability, generally between 1% and 2%.

　　There is no movable mechanical parts, so the instrument has a long life and less maintenance.

　　In a variety of working environments will not be affected by changes in media pressure, temperature, viscosity and other parameters, but will be affected by its operating principle, is not easy to install in vibration conditions.

　　Electromagnetic flowmeter:

　　Higher accuracy and stability, can reach 0.5% accuracy, applicable to the need for high-precision measurement occasions.

　　Measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity.

　　There is no obstruction of flow parts in the measuring tube, no pressure loss, and the requirement of straight pipe section is low.

　　Good corrosion and wear resistance.

　　Application Scenario

　　Vortex flowmeter: Due to its structural characteristics and working principle, it is suitable for the occasions that need to add a throttling device, such as tap water, gas and other industries. At the same time, due to the conductivity of the medium is not affected, also applies to some gas media measurement.

　　Electromagnetic flowmeter: it is suitable for the flow of higher precision requirements, smaller pipelines or the need for flow control occasions, such as liquid mixing, water treatment and other industries. These industries usually require the measurement medium has a high degree of conductivity.

　　In summary, vortex flowmeter and electromagnetic flowmeter have their own unique advantages and application scenarios. In the selection, according to the specific measurement requirements, media characteristics and working environment and other factors for comprehensive consideration.