Why in the interior of the electromagnetic flowmeter should have the lining

p { 文本- - - - - - 缩进:2 em; / * em is relative unit, 2 em now twice the size of a word * /} Different from other types of flowmeter, electromagnetic flowmeter lining has an internal pipe sections, depending on the measured liquid, the choice of the lining is different also, but one thing is the same, that is must be insulated material. Why there are such a kind of electromagnetic flowmeter need structure, what reason is based on? And electromagnetic flowmeter currently on the market what are the internal lining materials, the following is the author writing instructions. Electromagnetic flowmeter is to increase the lining. This should speak of from its working principle, electromagnetic flowmeter generally has a set of coil and two electrodes, the role of the coil is an electric field is put in the fluid, the flow of conducting liquid is equivalent to a conductor, according to Faraday's law of electromagnetic induction when conductor cutting lines of magnetic force produces a corresponding electromotive force is proportional to the speed, the effect of electrode is measuring the induced electromotive force, so the measuring tube only electrode is connected to the conductive liquid, other part is lined with, must guarantee the insulation, electromagnetic flowmeter can work normally. If there is a magnetic field the metal pipe is in contact with the liquid phase, electromagnetic flowmeter and the short circuit between the conductive liquid and metal, there will be a conductive, potential will cause electromagnetic flowmeter can't measure the electric potential, so the interior of the electromagnetic flowmeter are lining, this is the key to guarantee the normal work of the electromagnetic flowmeter can be one of the conditions. Specific work principle and relevant relationship can be explained by the following equation. Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction: conductive liquid for cutting lines of magnetic force in magnetic field movement, the potential is induced in the conductor, the induced potential E: E = KBVD type: K - B - magnetic induction intensity of V - measuring instrument constant average flow velocity in the piping section D - the inner diameter of the pipe cross section measurement flow, electrical conductivity of liquid with speed V through the perpendicular to the flow direction of magnetic field, the flow of the liquid conductivity sense if a voltage is proportional to the average flow velocity, the induced voltage signal by two or more direct contact with the liquid electrode pick, and through the cable to the converter by intelligent processing, then the LCD display or converted into a standard signal 4 ~ 20 ma output and 0-1 KHZ. In this way, the electromagnetic flowmeter can measure the conductive fluid flow. Therefore, electromagnetic flowmeter can measure the rate of flow of conducting liquid and the interior of the electromagnetic flowmeter should have lining. About electromagnetic flowmeter lining material has a lot of kinds, how to choose the lining materials is mainly based on the measured flow medium. The current body of physical and chemical properties including particle size, velocity, temperature, pressure, corrosion resistance, etc. Mastered the several aspects of requirements, with reference to the relevant material specification, then we can easy to choose. Here the author roughly summarizes several common lining materials and their corresponding material properties. This site has a detailed description of the specific knowledge, readers can refer to the electromagnetic flowmeter lining material for general introduction to several types to choose. Natural rubber ( Soft rubber) Application: 1, good flexibility, wear-resistant and pull force; 2, generally weak acid, weak alkali corrosion resistance; The water and sewage acid-resistant rubber ( Hard rubber) Applications: resistant to temperature of hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid, and 50% of sulfuric acid, sodium hydroxide, potassium hydroxide, corrosion, but not the corrosive action of strong oxidizer, general measurement of acid, alkali, salt solution neoprene ( 氯丁橡胶) Applications: 1, good elasticity, high break strength, wear-resisting performance is good; 2, generally low concentration of acid and alkali resistance, corrosion of the salt solution, but not the oxidation resistance of medium; ＜80℃； For water, sewage and mud and slurry. Polyurethane rubber ( 聚氨酯) Applications: 1st, excellent wear resistance. 2, acid, alkaline poor can < 40 ℃; Neutral strong abrasion of coal slurry, mud and slurry polytetrafluoroethylene ( PTFE) Applications: 1, resistance to boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, strong alkali and a variety of organic solvents; 2, wear-resisting performance is good, adhesive performance is poor; - - - - - - 80～+180℃； Concentration measurement, strong alkali, strong corrosive solution and medium health class. In this paper by embellish instrument technology co. , LTD. Arrange release.
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