The EMF electromagnetic flowmeter scale application in chemical production

Abstract: the EMF electromagnetic flowmeter scale application in the chemical production information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. EMF electromagnetic flowmeter in the application of chemical production flow is one of the determination of important parameters in the chemical production, as for the measurement of conductive liquid flow, whether the purpose is to monitor or measurement, the EMF can do measurement is stable, reliable, high precision, easy to flow is chemical. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the EMF electromagnetic flowmeter scale application in the chemical production article details. EMF electromagnetic flowmeter in the application of chemical production flow is one of the determination of important parameters in the chemical production, as for the measurement of conductive liquid flow, whether the purpose is to monitor or measurement, the EMF can do measurement is stable, reliable, high precision, easy to flow is one of the determination of important parameters in the chemical production, as for the measurement of conductive liquid flow, whether the purpose is to monitor or measurement, the EMF can do measurement is stable, reliable, high precision, easy to maintain. When instrument selection and use, the author combined with actual application summary introduced some points for your reference. 1, the working principle of the EMF EMF is the basic principle of Faraday's law of electromagnetic induction, the conductor in magnetic field cutting magnetic exercise induced electromotive force at both ends. As shown in figure 1, the conductive medium in the EMF measurement tube equivalent to conducting metal rods in the Faraday experiment, up and down at the ends of the two electromagnetic coils generate constant magnetic field. When a conductive medium flows through, can produce induction electric potential, the two electrodes, measure and draw out of pipeline internal induced voltage. Measuring pipeline through non-conductive lining ( Rubber, teflon, etc. ) Realize fluid and measuring electrode electromagnetic isolation. Assuming that electromagnetic induction coil magnetic field strength B ( T） As the constant, the induced voltage Ue ( V） Is proportional to the average speed of fluid ( m/s） , coefficient k, sounding pipe diameter (L m） For the known. The EMF is composed of flow sensor and transmitter of two parts. Sensor tube fitted with excitation coil, excitation current to produce magnetic field through the measuring tube, a pair of electrodes in measuring tube wall in contact with the liquid phase, which leads to the induction electric potential, sent to the transmitter. The excitation current was provided by the transmitter. 2, 1) the characteristics of EMF Structure is simple, the EMF measurement of pipe flow disturbance is a shine or throttling parts of smooth and straight, not easy to produce the problem such as congestion, wear. As a result, the EMF is particularly suited to containing solid particles or fibers of liquid-solid two-phase fluid, such as pulp, slurry, pulp, coal water slurry and sewage, etc. 2) Because there is no throttling, almost no pressure loss, consumes only 10 ~ 20 w electrical power, that compared with the throttle differential pressure flowmeter, the energy saving effect is a major advantage to the progress of the EMF. 3) The EMF of the proceeds of the volume flow, in fact, from the fluid density, viscosity, temperature, pressure, Reynolds number and the influence of the conductivity changes within a certain scope. 4) EMF measurement range is very large, usually for 20:1 ~ 50:1, each range from 2% ~ 100% linear measurement, EMF measurement range can cover the turbulent and laminar flow velocity distribution state, the flowmeter can not be compared to the other. 5) Measuring principle is linear, high measuring accuracy, fast response and measurable pulsating flow rate and the cumulative total fast, measurable positive and negative two-way traffic, sensor straight pipe before and after the demand is low. 6) Good corrosion resistance, the use of reliable, easy maintenance, long service life. However, EMF cannot measure the low conductivity of liquid, such as oil products and organic solvents, etc. ; Not measuring gas, steam, and with much larger bubbles in the liquid; The lining material and electrode insulation temperature limits, can't measure high temperature liquid. 3, EMF models consider points in the design of petrochemical industry, to choose suitable flowmeters are many factors to consider, specific to the characteristics of EMF, focused on the factors to consider four aspects, namely the instrument performance, flow characteristic, installation conditions and environmental conditions. 1) The function of the instrument performance on the market the EMF 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 the HART protocol system, PROFTBUS, Modbus, FF fieldbus, etc. EMF diameter range than other varieties of flow meters wide, such as E + H company provides W, P, H, three types of sensors are used in water and wastewater industry ( W) , chemical industry, food industry, P type) , food, pharmaceutical industry ( H) And diameter range from 2 mm to 2 m. Transmitter can provide 10, 50, 23, 53, a variety of choices, 10 for water industry the development of economy, 50 as normal, 53 is enhanced, 23 for two wire system. Precision can be 0. 5%, 0. 2% of two options. Measurable positive and negative two-way flow, pulsating flow rate can be obtained. For easy adhesion, deposition and scaling medium, such as velocity requirements shall be not less than 2 m/s, zui good up to 3 ~ 4 m/s or more, self-cleaning, prevent adhesion deposition, etc. Used for pulp and other abrasive fluid, the velocity should be lower than 2 ~ 3 m/s, in order to reduce the lining and the electrode wear and tear. The lining, and grounding electrode ring material selection is also key, are available for different medium about & other; Material manual & throughout; Materials devices commonly used, such as automatic control handbook '.

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