Electromagnetic flowmeter - flow measurement method and instrument selection

Electromagnetic flowmeter-flow measurement method and instrument selection Electromagnetic flowmeter is a kind of instrument for measuring the volume flow of conductive liquid based on Faraday's electromagnetic induction principle. According to Faraday's law of electromagnetic induction, when the conductor moves in the magnetic field as a cutting magnetic line, the conductor An induced voltage is generated, and the magnitude of the electromotive force is proportional to the speed at which the conductor moves perpendicular to the magnetic field in the magnetic field, and is converted into a flow rate according to the pipe diameter and the medium.

Electromagnetic flowmeter and selection principle: 1) The liquid to be measured must be a conductive liquid or slurry; 2), caliber and range, preferably the normal range is more than half of the full scale, and the flow rate is between 2 and 4 meters; ), the use pressure must be less than the pressure resistance of the flowmeter; 4) Different lining materials and electrode materials are used for different temperatures and corrosive media.

The measurement accuracy of the electromagnetic flowmeter is based on the fact that the liquid is filled in the pipeline, and the measurement problem of the air in the pipeline has not been well solved.

Advantages of electromagnetic flowmeter: no throttling components, so the pressure loss is small, reducing energy consumption, only related to the average velocity of the fluid to be measured, the measurement range is wide; only after water calibration, other media can be measured without correction, most It is suitable for use as a metering device for settlement. Due to continuous improvement of technology and process materials, continuous improvement of stability, linearity, accuracy and life, and continuous expansion of the pipe diameter, the measurement of the solid-liquid two-phase medium uses a replaceable electrode and a scraper electrode to solve the problem. High-pressure (32MPA), corrosion-resistant (anti-acid, alkali-lined) media measurement problems, as well as the ever-expanding caliber (maximum to 3200MM caliber), the continuous increase in life (generally greater than 10 years), electromagnetic flowmeters are getting more and more For a wide range of applications, the cost has also been reduced, but the overall price, especially for large diameters, is still high, so it has an important position in the procurement of flow meters.



Vortex flowmeter - flow measurement method and instrument selection
Under certain flow conditions, a part of the fluid kinetic energy is converted into fluid vibration, and its vibration frequency has a certain proportional relationship with the flow velocity (flow rate). The flowmeter operating according to this principle is called a fluid vibration flowmeter. At present, there are three types of fluid vibration flowmeters: vortex flowmeters, precession (vortex precession) flowmeters and jet flowmeters. Fluid vibrating flow meters have the following characteristics:
1) The output is a pulse frequency whose frequency is proportional to the actual volume flow of the fluid to be measured, which is not affected by fluid composition, density, pressure, temperature;
2) The measuring range is wide, and the general range can reach more than 10:1;
3) The accuracy is the upper middle level;
4) No moving parts, high reliability;
5) The structure is simple and firm, the installation is convenient, and the maintenance cost is low;
6) Wide range of applications, applicable to liquids, gases and vapours
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