Electromagnetic flow meter scale selection considering the point

Abstract: the electromagnetic flow meter scale selection considering the point of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter lectotype 7 main factors to 1, the application situation of large diameter instrument 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. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale selection considering the point of the article for details. Electromagnetic flowmeter lectotype 7 main factors to 1, the application situation of large diameter instrument is more applied in water supply and drainage engineering. Small 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 and steel industry blast furnace tuyere cooling water control and leakage, long distance pipeline hydraulic transportation of coal flow measurement and control. Small diameter, small diameter is often used in the pharmaceutical industry, food industry, biological engineering, etc have health requirements. 2, precision grade and function on the market universal EMF have bigger difference, the performance of some of the 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 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. 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. 3, velocity, and full flow, scope, degree and diameter 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 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 project running in low velocity or low flow tube early, 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, 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 low conductance of the 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. Can provide domestic caliber of finished products from 10 mm to 3000 mm, with the actual application is in the majority with small diameter, but unlike most other principle of flow meter ( Such as displacement, turbine, vortex type or coriolis mass type, etc. ) Compared to large diameter instrument occupies a larger proportion. 4, liquid conductivity is the premise of using the EMF measured liquid must be conductive and not lower than the threshold ( The lower limit value) 。 Electrical conductivity is lower than the threshold will produce measurement error until you can't use, even change can be measured more than threshold, little change of error of indication, universal threshold in 10 - EMF The 4 ~ ( 5 & 次; 10 - 6) S/cm between, depending on the model. When using also depends on sensors and switches between flow line length and its distributed capacitance, usually in factory operating instructions conductivity signal corresponding to the length. Non-contact capacitance coupling large-area electrode conductivity meter can be test as low as 5 & times; 10 - 8 s/cm of the liquid. Industrial water and its aqueous solution, the electrical conductivity of more than 10 - 4 s/cm, acid, alkali, salt solution conductivity in 10 - 4 ~ 10 - 1 s/cm between, use there is no problem, low-alcohol distilled water for 10 - 5 s/cm is no problem.
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It is essential to know the basic functioning of to help us understand the components and the part they play.
Long gone are those days when rosemount vortex flow meter were used to vortex flow meter manufacturer. Now new like electromagnetic flow meter slurry mass flow meter have come up.