LDG electromagnetic flowmeter

With the development of the times, China has got rid of the phenomenon of relying solely on agricultural development in the past, and has gradually moved towards industrialization. Then, the development of re-industry is naturally inseparable from the use of instruments, especially LDG electromagnetic flowmeters. Because of its sensitive response, no mechanical inertia, little external interference, and wide application range, LDG electromagnetic flowmeter is used in many industrial occasions. Then someone will ask, what kind of product is LDG electromagnetic flowmeter? Let me tell you about the principle of LDG electromagnetic flowmeter and some requirements when selecting the model, so that everyone will not be fooled by some bad manufacturers when buying LDG electromagnetic flowmeter.　　Principle: The measurement principle of LDG electric flowmeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a short non-magnetic alloy tube lined with insulating material. Two electrodes are fixed on the measuring tube through the tube wall along the tube diameter direction. The electrode tip is basically flush with the inner surface of the lining.　　 When the excitation coil is excited by double-wave pulses, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this time, if a fluid with a certain conductivity flows through the measuring tube. The electromotive force E is induced by the cutting magnetic field lines. The electromotive force E is proportional to the magnetic flux density B, and the product of the inner diameter d of the measuring tube and the average flow velocity v is measured. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through the cable. After the converter amplifies the flow signal, it can display the fluid flow, and can output pulses, analog current and other signals for flow control and adjustment.　　Structure: The structure of LDG electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring catheter, electrode, shell, lining and converter.　　Type selection: selection of caliber and range　　The transmitter caliber is usually the same caliber as the piping system. If the share channel system needs to be designed, the caliber can be selected according to the flow mother range and flow rate. For the electromagnetic flowmeter, the flow velocity is more suitable to be 2-4m/s. In special circumstances. If there are solid particles in the liquid, taking into account the abrasion, the usual flow rate ≤ 3m/s can be selected. For the fluid that is easy to attach to the pipe wall, the flow rate ≤ 2m/s can be selected. To determine the diameter of the transmitter. The choice of lining: as a direct contact medium, it is also a structure with more contact media. The choice of lining is also particularly important. When choosing, the lining material should be selected according to the corrosiveness, abrasion and temperature of the measured medium: 　　 1. Natural rubber (Soft rubber) 　　 1, better elasticity, abrasion resistance and tearing force 2, resistance to general weak acid and weak alkali corrosion 3, water and sewage measurement 2, acid-resistant rubber (hard rubber) 　　 can be resistant to hydrochloric acid at room temperature, Acetic acid, oxalic acid, ammonia water, phosphoric acid and 50% sulfuric acid, sodium hydroxide, potassium hydroxide corrosion, but not resistant to the corrosion of strong oxidants, test general acid, alkali, salt solution 3. Neoprene (Neoprene) 　　 1, extremely Good elasticity, high breaking force, good abrasion resistance 2. Resistance to corrosion of low-concentration acid and alkali, salt solution, but not resistant to corrosion of oxidizing medium <80℃; 　　 test water, sewage, mud and mineral slurry , Polyurethane rubber (Polyurethane) 　　 1, excellent abrasion resistance 2, poor acid and alkali resistance <40 ℃ 　 　 test neutral strong abrasion coal slurry, mud and mineral slurry 5, polytetrafluoroethylene (PTFE) 　　 1, resistant Boiling hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkali and various organic solvents 2. Good abrasion resistance, poor bonding performance -80～+180℃; 　　 measures the concentration, strong alkali and strong corrosive solution and sanitary medium pass I gave you an introduction to the LDG electromagnetic flowmeter above. I think everyone has a clear direction when purchasing the LDG electromagnetic flowmeter. But here I would like to remind everyone that although the LDG electromagnetic flowmeter has a wide range of applications, it is not suitable for all occasions. For example, the total LDG electromagnetic flow cannot be used to measure gas, steam, and a large amount of gas. The liquid can not be used to measure liquid media with very low conductivity. The electromagnetic flowmeter can not measure petroleum products or organic solvents and other media, nor can it be used to measure high-temperature media. So everyone must have an understanding of their own working conditions when choosing a model, and then when choosing a product, there will be no problem of buying a product but not being able to use it.

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