Ten reasons why electromagnetic flowmeters are preferred in flow measurement

Electromagnetic flowmeter is a type of flowmeter commonly used in production and life. With the advancement of instrument production technology, the measurement technology and measurement accuracy and stability of electromagnetic flowmeter are also constantly improving. According to relevant data, the market share of electromagnetic flowmeter in the industrial instrument industry has increased year by year, and it has become the main instrument type in the field of flow measurement. The product advantages of electromagnetic flowmeter are very significant among many flowmeters, especially in industrial fields such as sewage treatment and chemical production, and have been widely used with remarkable results. According to the summary of our technical personnel, there are the following ten points, and users can refer to and choose according to the working conditions in our company's production.
 
1. The electromagnetic flowmeter has a large measurement scale, usually 20:1~50:1, and a wide range of optional flow rates. The full-scale liquid flow rate can be selected within 0.5~10m/s. Some models of instruments can expand and reduce the flow rate according to needs on site (for example, a 4-digit potentiometer is set to set the instrument constant) without removing it for offline real flow calibration.
 
2. The caliber scale of the electromagnetic flowmeter is wider than that of other types of flow meters, ranging from a few millimeters to 3m. It can measure forward and reverse bidirectional flow, as well as pulsating flow, only when the pulsating frequency is much lower than the excitation frequency. The instrument input is essentially linear. It is easy to choose the type of material of the fluid contact parts, and can be used for corrosive fluids.
 
3. The measuring channel of the electromagnetic flowmeter is a lubricated straight pipe without a flow-blocking detection part. Because it is not easy to block, it is suitable for measuring liquid-solid two-phase fluids containing solid particles or fibers, such as pulp, coal-water slurry, ore slurry, mud and sewage.
 
4. The electromagnetic flowmeter does not cause pressure loss due to the detection of flow. The resistance of the instrument is only the resistance along the same length of the pipeline. The energy-saving effect is obvious. It is most suitable for large-diameter water supply pipelines that require low resistance loss.
 
5. The electromagnetic flowmeter has no mechanical inertia and is sensitive to reaction. It can measure instantaneous pulsating flow and flow in both forward and reverse directions.
 
6. The electromagnetic flowmeter is because the induced voltage signal is generated in the entire space full of magnetic field, which is the average value on the pipeline surface. Therefore, the straight pipe section required by the sensor is shorter, with a length of 5 times the diameter of the pipeline.
 
7. The electromagnetic flowmeter has no obstructions in the measuring pipe, so there is no additional pressure loss; there are no moving parts in the measuring pipe, so the sensor life is extremely long.
 
8. The sensor structure of the electromagnetic flowmeter is simple, there are no moving parts in the measuring pipe, and there are no throttling parts that hinder the flow of the fluid. Therefore, when the fluid passes through the flowmeter, it will not cause any additional pressure loss. It is one of the flow meters with the lowest operating energy consumption.
 
9. The volume flow measured by the electromagnetic flowmeter is actually not significantly affected by changes in fluid density, viscosity, temperature, pressure and conductivity (only above a certain threshold). Compared with most other flow meters, the requirements for the front straight pipe section are lower.
 
10. It can measure the flow of dirty media, corrosive media and suspended liquid-solid two-phase flow. This is because there are no obstructive flow parts inside the measuring tube of the instrument, and only the measuring tube lining and electrodes are in contact with the measured fluid. The material can be selected according to the properties of the measured fluid. For example, using polytrifluoroethylene or polytetrafluoroethylene as the lining can measure various corrosive media such as acids, alkalis, and salts; using wear-resistant rubber as the lining is particularly suitable for measuring liquid-solid two-phase flows such as ore slurry and cement slurry with solid particles and high wear, as well as various suspended liquids such as fiber-containing liquids and pulp.