The application of electromagnetic flowmeter is introduced in detail

Abstract: The application information of electromagnetic flowmeters is introduced in detail by the excellent flowmeter and flowmeter production and quotation manufacturers. Electromagnetic flowmeters are widely used. According to the application, there are large caliber, medium and small caliber, small caliber and small caliber. Among them, large-diameter electromagnetic flowmeters are mainly used in water supply and drainage projects, while medium and small-diameter electromagnetic flowmeters are often used for solid-liquid two-phase, difficult-to-measure fluids or requirements. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is a detailed introduction to the application of electromagnetic flowmeters. Electromagnetic flowmeters are widely used. According to the application, there are large caliber, medium and small caliber, small caliber and small caliber. Among them, large-diameter electromagnetic flowmeters are mainly used in water supply and drainage projects, while medium- and small-diameter electromagnetic flowmeters are often used in solid-liquid two-phase, difficult to measure fluids or high-demand occasions, such as pulp and black liquor measurement in paper industry, non-ferrous metallurgy Industrial measurement of pulp, coal preparation plant measurement of coal slurry, strong corrosive liquid in chemical industry, cooling water control of blast furnace tuyere in iron and steel industry, flow measurement of long-distance pipeline coal transportation and hydraulic transmission control, etc. Whereas small diameters and small diameters are usually used in places with hygienic requirements, such as in the pharmaceutical industry, food industry and bioengineering. The liquid of the electromagnetic flowmeter contains mixed substances, and the tiny bubbles mixed into the bubble flow can still work normally, but the measured mixed volume flow contains the bubble volume; if the gas content increases, a slug flow is formed, and the circuit will be disconnected immediately , because the electrodes may be covered by gas, the output will jitter or even not work properly. For example, drilling muds, drilling cement slurries and paper pulps are actually non-Newtonian fluids. Since the solids flow together in the carrier liquid, solid-liquid two-phase fluids containing non-ferromagnetic particles or fibers can also measure the volumetric flow of the two phases. High solids content fluids. There is a gap between them, and there is a difference in speed. Single-phase liquid calibrators introduce additional errors when used in solid-liquid two-phase fluids. Although there is no systematic experimental lecture to discuss the effect of electromotive force on solid matter in solid-liquid two-phase fluid, there are reports abroad that when the solid matter content is 14%, the error is within 3%; In the experiment of the institute, when measuring the high sediment content flow, the measurement error of the sediment volume is less than 3%, and the median particle size is 0.35 mm. Larger particles in the material will rub against the electrode surface. In order to make the flow signal unstable, an instrument with a higher frequency or an instrument with strong ability to suppress mud noise, or an instrument with AC excitation or dual-frequency excitation must be selected. Measurement errors will occur. However, the effect of ferromagnets can be reduced by the electromotive force compensated by the flux detection coil in the magnetic circuit. Shanghai Guanghua Instrument Factory stated in the experimental speech of the AC exciter that due to the different content of ferromagnets in the measuring tube, the common electromotive force of the fluid containing ferromagnetic substances will also change. Slurry containing iron ore concentrate in water, liquid to solid weight ratio 41, particle size≤0.15mm. The comparative flow test of clean water and ore pulp is carried out with an 80 mm measuring tool. The display value of the usual measuring tool changes by 7%, and the indication error is in±within 2% fs. Note the wear level of the sensor lining and apply it to pulp containing ore particles. Additional errors arise when the inner diameter of the measuring tube increases. A ceramic lining or polyurethane rubber lining with good abrasion resistance should be used here. At the same time, it is recommended to install the sensor device on the vertical pipeline to make the pipeline wear evenly and eliminate the defect of serious local wear on the lower half of the horizontal device. A nozzle-shaped sheath can also be installed at the inlet end of the sensor for relatively long service life. If a conductive substance with a higher conductivity than the liquid is attached, the liquid that is easily attached is measured and the substance is deposited on the pipe wall. The signal potential will be short-circuited and will not work. If it is a non-conductive layer, you should first pay attention to electrode contamination, for example, choose a pointed or hemispherical protruding electrode that is not easy to adhere, replaceable electrode, scraper-type scale cleaning electrode, etc. The wiper electrode allows regular scraping of limescale outside the sensor by hand. In foreign products, ultrasonic sensors are installed on electrodes to remove surface scale, but these are rare now. There is also a temporary disconnection of the measurement circuit, and low voltage and high current flow during the electrode rest time to incinerate and remove the adhesive layer of adhering grease. In places prone to adhesion, the flow rate can be increased for self-cleaning purposes. A convenient and easy-to-clean pipe connection can also be used, without the need to install a cleaning sensor. The meter can still work, the non-contact electrode electromotive force is attached to the non-conductive film layer. However, it also won't work if it's a highly conductive layer. The corrosion resistance, wear resistance and upper temperature limit of the material affect the adaptability of the instrument to the fluid. With fewer components, the sensor elements in contact with the fluid include lined (or measuring tube made of insulating material) electrodes, ground rings, and gaskets. The electromagnetic flow sensor has a simple shape, flexible data selection, and strong adaptability to fluids. Linear data of electromagnetic flowmeter (or measuring tube in direct contact with medium) such as industrial water, waste water and weak acid and weak base, commonly used lining materials include fluoroplastic polyurethane rubber, neoprene rubber and ceramics.
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