Which sewage electromagnetic flowmeter is better

Electromagnetic flowmeters are not affected by changes in fluid density, viscosity, temperature, pressure and conductivity, and have a wide measurement range and corrosion resistance, so they are widely used in industry, especially sewage treatment. Sewage electromagnetic flowmeter has also become the capital for many businesses to make money. There are so many sewage electromagnetic flowmeter manufacturers on the market, and the quality is uneven. Which manufacturer of sewage electromagnetic flowmeter is better? So here I want to tell everyone that the quality of the sewage electromagnetic flowmeter does not mean just looking at it. Fame is enough. First of all, you have to understand what is the principle of the electromagnetic flowmeter for sewage treatment, and how to choose the model, because there is a good saying: the best is not the best for you, then I will give you everyone below Talk about the principle of sewage electromagnetic flowmeter and selection rules.　　Principle: Electromagnetic Flowmeters (EMF for short) is a new type of flow measurement instrument that developed rapidly with the development of electronic technology in the 1950s and 1960s. Electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow of conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field. Classification: According to the different types of applied magnetic field, electromagnetic flowmeters mainly have two types: DC electromagnetic flowmeters and induction electromagnetic flowmeters: The external constant magnetic field B of the DC electromagnetic flowmeter is perpendicular to the pipe axis, and two places C and D are installed. Two electrodes are used to measure the electromotive force U induced when the fluid traverses the magnetic field.　　 Induction electromagnetic flowmeter: In the case that the temperature of the measured fluid is too high or the electrode has a strong corrosive effect, an induction electromagnetic flowmeter can be used.　　 There are no other parts in the pipeline of the electromagnetic flowmeter, so in addition to measuring the flow of conductive fluids, it can also be used to measure the flow of non-conductive liquids of various viscosities (in which easily ionizable substances are added). Electromagnetic flowmeters are often used in the nuclear energy industry.　　 The display method of electromagnetic flowmeter is divided into: split electromagnetic flowmeter, integrated electromagnetic flowmeter. The nominal diameter of the series is DN15～DN3000. The split electromagnetic flowmeter is an inductive instrument that measures the volume flow of the conductive medium in the tube according to Faraday's law of electromagnetic induction. It adopts single-chip embedded technology to realize digital excitation. At the same time, it uses CAN field bus on the electromagnetic flowmeter. It is a domestic initiative. The technology has reached the leading domestic level. The split type electromagnetic flowmeter can output 4-20mA current signal for recording, adjustment and control while meeting on-site display. It has been widely used in chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technologies and Management department.　　Separate electromagnetic flowmeter can measure the flow of general conductive liquids, as well as the volume flow of liquid-solid two-phase flow, high-viscosity liquid flow and salt, strong acid, and strong alkali liquid.　　 One-piece electromagnetic flowmeter is formulated according to Faraday's law of electromagnetic induction to measure the volume flow of conductive fluids.　　Model selection: selection of caliber and range　　The transmitter caliber is usually the same caliber as the piping system and. 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 cases. 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. Electromagnetic flowmeter to determine the diameter of the transmitter.　　The range of the transmitter can be selected according to two principles: one is that the full scale of the instrument is greater than the expected maximum flow value, and the other is that the normal flow is greater than 50% of the full scale of the instrument to ensure a certain measurement accuracy. Lining selection The correct selection method of the lining material of the electromagnetic flowmeter should be based on the corrosiveness, abrasion and temperature of the measured medium to select the lining material: 　　1. Natural rubber (soft rubber)　　1. Better elasticity, abrasion resistance and tearing Breaking force 2, resistance to general weak acid and weak alkali corrosion 3, water test, sewage 2, acid-resistant rubber (hard rubber) 　　 can withstand hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid and 50% sulfuric acid, sodium hydroxide at room temperature , Potassium hydroxide corrosion, but not resistant to corrosion by strong oxidants.　　 can measure general acid, alkali, salt solution. 3. Neoprene (Neoprene)　　 1. Excellent elasticity, high tearing force, good wear resistance 2. Resistance to corrosion by low-concentration acid and alkali, salt solution, but not resistant to corrosion by oxidizing media, and Temperature requirement <80℃; 　　 can measure water, sewage, mud and ore slurry.　　Four, Polyurethane 　　1, excellent abrasion resistance, 　　2, poor acid and alkali resistance, temperature requirements <40℃　　 test neutral and strong abrasion coal slurry, mud and mineral slurry 　
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