Electromagnetic flowmeter selection to consider several factors

Electromagnetic flowmeter using covering. 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 black liquor, non-ferrous cure sold for pulp, coal preparation plant, coal slurry, strong corrosion liquid chemical industry and steel industry blast furnace tuyere moderation and inspect leakage of cooling water, long distance pipeline flow measurement and control of the hydraulic walks of coal. Small, small caliber is often used in industrial hygiene, food industry, biological engineering, etc. 1. Precision grade and function on the market the function of universal electromagnetic flowmeter has great difference, some high precision and function is much, some low precision, simple function. Basic error of high precision instrument for ( Soil is 0. 5% and 1%) R, low accuracy of the instrument is ( 1. 5% and 2. 5%) FS, both the 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 degree of *, only basic error ( ± 0. 2% and 0. 3%) R, but have severe installation to beg to surrender reference premise, temperature from 20 to 22 ℃ condition, for example, buy straight pipe length required to distinguish before and after more than 10 d, 3 d ( In the world for 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, in order to add a clip of bad influence. So in a variety of models to choose more don't look pure zhi only high purpose, to read the manufacturer do comprehensive analysis of sample or package insert. The function of electromagnetic flowmeter has a very big difference on the market, simple just measure the one-way traffic, only after flags output analog signal to drive an instrument; Utility instrument with two-way flow measuring flow alarm, switch range, upper and lower limits, atc and the power cut off display and alarm, cut of small flag sign, flow volume calculation, automatic check and disadvantages since diagnosis, communicate with PC and motion configuration, etc. Some models of instrument serial digital communication function can choose various communication interface and special chip ( ASIC) Connected to HART, the talks system, PROFTBUS, Modbus, CONFIG, FF fieldbus, etc. 2. Velocity, full flow, and caliber selected meter diameter and pipe diameter, not necessarily to be depending on the traffic. Process industry walks the viscosity liquid, such as water pipe velocity popular economic flow rate is 1. 5~3m/s。 Flow meter on how pipes, sensor size like the pipe diameter. Electromagnetic flowmeter full flow when the liquid flow rate can be in 1 ~ 10 m/s within the limited selection. Limit velocity on the things is not to be, but the world suggest not beyond 5 m/s, unless the lining materials can withstand the flow scouring, rarely exceeds 7 m/s theory, beyond 10 m/s are more rare. Full flow velocity limit popular for 1 m/s, some models instrument is 0. 5m/s。 Some early engineering operation flow is low or in low velocity piping, from the Angle measurement precision thinking, meter diameter should be to switch to smaller than the pipe diameter, with the reducing pipe connection. Used to have a easy adhesion, aggregation and fouling substances such as flow, velocity of no less than 2 m/s, ZUI good up to 3 ~ 4 m/s or above, have since the cleaning, prevent adhesion accumulated result. Used for pulp and other strong abradability of fluid, commonly used flow rate should be lower than 23 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, can choose low velocity ( Less than zero. 5~1m/s) That the velocity increase movement will add noise, while the output of hanging. Bureau of electromagnetic flowmeter is relatively large, there is no less than 20, with a range of automatic switching function of the instrument, but exceeds 50 ~ 100. 3. Liquid conductivity by using electromagnetic flowmeter is the premise of measured liquid must be conductive, not below the threshold. Electrical conductivity is lower than the threshold will attack measurement error and can't use, beyond the threshold value can be measured, even change little change of error. Use will also depend on the sensor and converter between traffic flag signal line length and its distributed capacitance, factory using the world rules conductivity phase in the package insert the corresponding flag signal line 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, acid, alkali, salt solution, etc. , used there is no problem. Petroleum products and low conductivity will not be able to use organic solvent. Find some pure liquid from the data or aqueous solution conductivity is low, that can't use, but in theoretical obligations will be touched by containing impurities can use instances. Information about aqueous solution, the electrical conductivity is to use pure water ratio in the execution chamber measured, the theory of the aqueous solution can be used the ratio of industrial water, conductivity will be higher than Chad, and conducive to the flow measurement. Good theory using the liquid conductivity ZUI threshold than instrument factory rules at least an order of magnitude. 3. Foreign substance in the liquid mixed with a bubble flow of tiny air bubbles can still be normal obligation, but measured is mixed volume flow containing bubble volume: such as gas content added to play ( Block) Flow pattern, because the electrode can be covered gas circuit instantaneous disconnection, output swinging and even can't normal duty. Containing the ferromagnetic particles or fiber solid-liquid two-phase fluid can be measured the size of two phase flow. Fluid solid content is higher, such as drilling mud, drilling solid slurry, pulp, etc have been theoretically non-newtonian fluid.

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