Application of EMF Electromagnetic Flow Meter in Chemical Production

Abstract: The application information of EMF electromagnetic flowmeter in chemical production is provided by excellent flowmeter and flowmeter manufacturers. The application of EMF electromagnetic flowmeter in chemical production Flow is one of the important measurement parameters in chemical production. As far as the measurement of conductive liquid flow is concerned, no matter the purpose is monitoring or measurement, EMF can achieve stable, reliable, high-precision measurement. Easy flow is chemical. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of EMF electromagnetic flowmeters in chemical production. The application of EMF electromagnetic flowmeter in chemical production Flow is one of the important measurement parameters in chemical production. As far as the measurement of conductive liquid flow is concerned, no matter the purpose is monitoring or measurement, EMF can achieve stable, reliable, high-precision measurement. EMF is one of the important measurement parameters in chemical production. As far as the flow of conductive liquids is measured, no matter the purpose is monitoring or measurement, EMF can achieve stable, reliable, high-precision, and easy-to-maintain measurements. In the selection and use of the instrument, the author summarizes some key points in combination with the actual application for your reference. 1. The working principle of EMF The basic principle of EMF is Faraday's law of electromagnetic induction, that is, when a conductor cuts a magnetic motion in a magnetic field, an induced electromotive force is generated at both ends. As shown in Figure 1, the conductive medium in the EMF measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows, an induced potential will be generated, and the induced voltage will be measured and drawn by two electrodes inside the pipe. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode by means of a non-conductive lining (rubber, Teflon, etc.). Assuming that the magnetic field strength B (T) generated by the electromagnetic induction coil is constant, the induced voltage Ue (V) is proportional to the average velocity of the fluid (m/s), the coefficient is k, and the inner diameter of the measuring tube L (m) is known. EMF consists of two parts: flow sensor and transmitter. The sensor measuring tube is equipped with an excitation coil up and down. After passing the excitation current, a magnetic field is generated to pass through the measuring tube. A pair of electrodes are installed on the inner wall of the measuring tube to contact with the liquid, and the induced potential is drawn out and sent to the transmitter. The excitation current is provided by the transmitter. 2. Features of EMF 1) The structure is simple. The measuring pipe of EMF is a smooth straight pipe with no flow disturbance or throttling, and is not prone to blockage and wear. Therefore, EMF is especially suitable for liquid-solid two-phase fluids containing solid particles or fibers, such as pulp, mud, mineral pulp, coal-water slurry and sewage. 2) Since there is no throttling part, the meter has almost no pressure loss and only consumes 10-20W of electric power. Compared with the throttled differential pressure flowmeter, its energy saving effect has become a major advantage of EMF development. 3) The volume flow rate obtained by EMF is actually not affected by fluid density, viscosity, temperature, pressure, Reynolds number and changes in conductivity within a certain range. 4) The measurement range of EMF is very large, usually 20:1 to 50:1, and each range can be measured linearly from 2% to 100%. The measurement range of EMF can cover two velocity distribution states of turbulent flow and laminar flow. It is unmatched by other flow meters. 5) The measurement principle is linear, the measurement accuracy is high, the response speed is fast, the pulsating flow rate and the fast accumulated total amount can be measured, the forward and reverse bidirectional flow rate can be measured, and the requirements for the straight pipe sections before and after the sensor are low. 6) Good corrosion resistance, reliable use, easy maintenance and long service life. However, EMF cannot measure liquids with very low electrical conductivity, such as petroleum products and organic solvents; it cannot measure gases, vapors, and liquids containing many larger bubbles; limited by the temperature of lining materials and electrode insulating materials, it cannot measure relatively high temperature liquid. 3. The main points to consider in the selection of EMF In the petrochemical design, there are many factors to be considered in choosing a suitable flow meter. Specifically to the characteristics of EMF, it is necessary to consider four factors, namely instrument performance, flow characteristics, and installation conditions. and environmental conditions. 1) The functions of EMF in the instrument performance market are also very different. The simple one is to measure the one-way flow, and only output the analog signal to drive the rear instrument; And power cut off alarm, small signal cut off, flow display and total calculation, automatic check and fault self-diagnosis, communication with upper computer and motion configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and special-purpose chips (ASIC) to connect HART protocol systems, PROFTBUS, Modbus, FF fieldbus, etc. The caliber range of EMF is wider than other varieties of flow meters. For example, E+H company provides W, P, H three types of sensors, which are respectively used in water and sewage industry (W type), chemical industry, food industry (P type), food , Pharmaceutical industry (H type), caliber range from 2 mm to 2 meters. The transmitter can provide 10, 50, 23, 53 options, 10 is the economical type developed for the water industry, 50 is the ordinary type, and 53 is the enhanced type.23 is a two-wire system. Accuracy can be 0.5%, 0.2% two options. It can measure forward and reverse bidirectional flow, and also measure pulsating flow.

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