Electromagnetic flow meter scale of some of the techniques and matters needing attention

Abstract: some skills and matters needing attention of electromagnetic flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: in this paper, in combination with the author's personal experience, electromagnetic flowmeter is introduced in terms of its selection should have some skills and the matters needing attention. 1. Preface electromagnetic flowmeter ( The EMF) Is made by using Faraday's law of electromagnetic induction of a conductive measurement. More flow meter manufacturers choose model price quote you are welcome to inquire, here are some of the techniques and matters needing attention scale electromagnetic flowmeter article details. In this paper, combined with the author's personal experience, the thesis introduces the electromagnetic flowmeter in its chosen should have some skills and the matters needing attention. 1. Preface electromagnetic flowmeter ( The EMF) Is made by using Faraday's law of electromagnetic induction of a conductive liquid volume flow measurement instrument. EMF has realized industrialization in the early 1950 s, the worldwide in recent years, the EMF production accounts for about 5% of the total industrial flow meter to 6. This value is 5%, especially since 2000, has a tendency to rise year by year. Electromagnetic flow meter as a kind of industrial flow measurement instrument, has some skills and the matters needing attention in its use, combined with some personal experience and my discussion here, hope I can contributed to the right to choose for electromagnetic flowmeter. Electromagnetic flowmeter selection 2. 1 applications of electromagnetic flowmeter application field is very broad. According to the applications with large diameter, small diameter, small diameter and small caliber, in which large diameter electromagnetic flowmeter is more applied in water supply and drainage engineering, small and medium caliber is often used in solid-liquid two equal several fluid or high demand, such as measurement of papermaking industry of paper slurry and pulp of the black liquor, nonferrous metallurgy industry, coal preparation plant of coal slurry, strong corrosion liquid chemical industry, steel industry blast furnace tuyere cooling water control, long distance pipeline hydraulic transportation of coal flow measurement and control, etc. , and small and small caliber is often used in pharmaceutical industry, food industry, biological engineering, etc have health requirements. 2. 2 precision grade and function on the market universal EMF have bigger difference, the performance of some high precision and function is much, some low precision, simple functions. Basic error of high precision instrument for ( ± 0. ~ ± 5%; 1%) R, low accuracy of the instrument is ( ± 1. ~ ± 5%; 2. 5%) The FS, both price difference between 1 ~ 2 times. So the measurement accuracy requirement is high place ( Non-trade accounts only for the purpose of control, for example, only the place with high reliability and excellent repeatability demand) Choose high precision instrument on the economy is not economical. Some models the meter says it has a higher accuracy, only basic error ( ± 0. 2%～± 0. 3%) R, but there are strict installation requirements and terms of reference, such as environmental temperature 20 ~ 22 ℃ and straight pipe length requirements respectively before and after 10 d and 3 d ( Usually a 5 d and 2 d) Straight pipe before and after, and even the flow sensor is put forward to form a whole in the flow standard device for solid flow calibration, to reduce the loading effect. So in a variety of models to choose more don't just look at the high index, to read the manufacturer do comprehensive analysis of sample or specification. EMF function on the market difference is big, simple just measure the one-way traffic, only after output analog signal to drive an instrument; Multifunctional instrument with two-way flow measuring, switch range, upper and lower flow alarm, air traffic control and the power cut off alarm, cut of small signal, flow display and volume, automatic check and fault self-diagnosis, communicate with PC and motion configuration, etc. Some models of instrument serial digital communication function can choose a variety of communication interface and dedicated chip ( ASIC) To connect, PROFTBUS, Modbus, HART protocol system CONFIG, FF fieldbus, etc. 2. 3 velocity, scope of full flow, degree and diameter meter diameter is not necessarily the same as the pipe diameter, selected should be depending on the traffic. Process industry conveying the different liquid viscosity, such as water pipe flow is usually economic velocity of 1. 5～3m/s。 EMF in the pipeline, the sensor size is the same as the pipe diameter. EMF full flow when the liquid flow rate can be in 1 ~ 10 m/s within the scope of selection, range is relatively wide. Limit velocity is not restricted in principle, however, is generally recommended that no more than 5 m/s, unless the lining materials can withstand the flow scouring and actual application rarely more than 7 m/s, more than 10 m/s are more rare. Full flow velocity limit generally is 1 m/s, some models instrument is 0. 5m/s。 Some new construction early running in low velocity or low flow tube system, measuring precision, meter diameter should be to switch to smaller than the pipe diameter, by reducing pipe connection. Used to have a easy adhesion, deposition and scaling substances such as fluid, selects the velocity of not less than 2 m/s, zui good up to 3 ~ 4 m/s or more, from cleaning, prevent adhesion deposition. Used for pulp and other strong abradability of fluid, commonly used flow rate should be lower than 2 ~ 3 m/s, in order to reduce the lining and the electrode wear and tear. In the measurement of near threshold value ( The lower limit value) The low conductivity of liquid, as far as possible the selected low velocity ( Less than zero. 5～1m/s） That the flow velocity increase noise increases, while the output to shake. The scope of the EMF degree is relatively large, usually not less than 20, with a range of automatic switching function of the instrument, can be more than 50 ~ 100.

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