What factors should be paid attention to buy electromagnetic flow meter scale

Abstract: what factors should be paid attention to buy electromagnetic flowmeter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. How to correct selection of suitable electromagnetic flowmeter, for many buyers is a very headache problem, today small make up to help you solve this problem, with the following, I think we'll know how to go to the correct selection of electromagnetic flowmeter. More flow meter manufacturers choose model price quote you are welcome to inquire, here is what factors should be paid attention to buy electromagnetic flowmeter scale article details. How to correct selection of suitable electromagnetic flowmeter, for many buyers is a very headache problem, today small make up to help you solve this problem, by using the following story, I think we'll know how to go to the correct selection of electromagnetic flowmeter will have a very important to know, or can be secco's environmental protection science and technology Beijing. The application of electromagnetic flowmeter in industry there are three main kinds of, a large diameter instrument is more applied in water supply and drainage engineering, there is a small and medium caliber is often used in solid-liquid dual unforeseen equal 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 and steel industry blast furnace tuyere cooling water control and leakage, long distance pipeline hydraulic transportation of coal flow measurement and control. Zui after one is small, small caliber is often used in the pharmaceutical industry, food industry, biological engineering, etc have health requirements. Precision grade and function in the market circulation flow meter according to the different application and use of the environment is different, the performance of the universal electromagnetic flowmeter has great difference, 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 is not high places with high precision instrument on the economy is not worthwhile. 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 set straight pipe length requirements respectively before and after more than 10 d, 3 d ( Usually a 5 d, 2 d) Even before and after the flow sensor is put forward to buy straight tube of a body in the flow standard device for solid flow calibration, to reduce the effect of clamp pack is not good. 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. The function of electromagnetic flowmeter has a very big difference on the market, simple measuring only one-way traffic, only after output analog signal to drive an instrument; Function instrument a two-way flow measurement, switch range, upper and lower flow alarm, atc 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 ASIC chip) To connect, PROFTBUS, Modbus, HART protocol system CONFIG, FF fieldbus, etc. Velocity, full flow, scope, degree and diameter in choosing a caliber according to their own needs to choose. Selected meter diameter is not necessarily the same as the pipe diameter, depending on the traffic. Process industry conveying the different liquid viscosity, such as water pipe flow is usually 1 & economic velocity middot; 5~3m/s。 Flowmeter in the pipeline, the sensor diameter is the same as the pipe diameter. Electromagnetic flowmeter full flow when the liquid velocity can within the scope of 1 ~ 10 m/s. 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 & middot; 5m/s。 Some initial flow rate is low or works in low velocity piping, think in terms of accuracy of measurement, meter diameter should be to switch to smaller than the pipe diameter, with the 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.

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