The working principle and composition of electromagnetic flowmeter

Abstract: the electromagnetic flowmeter, working principle and structure of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter 1. The working principle of the electromagnetic flowmeter measurement principle is shown in figure 1. According to Faraday's law of electromagnetic induction, when conducting liquid flow in the magnetic field it produces electromotive force E, E the electromotive force is proportional to the magnetic induction intensity and magnetic induction intensity B B. Conductive liquid. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the working principle of electromagnetic flowmeter and the details of the article. 1. Working principle of the electromagnetic flowmeter measurement principle of electromagnetic flowmeter is shown in figure 1. According to Faraday's law of electromagnetic induction, when conducting liquid flow in the magnetic field it produces electromotive force E, E the electromotive force is proportional to the magnetic induction intensity and magnetic induction intensity B B. Average flow velocity v of conductive liquid: E = KBDv type: E— — Conductive fluid in the magnetic field generated by the electromotive force V. K - — — Proportional coefficient, inner tube diameter D and magnetic induction intensity; In the case of B is constant, K is constant 1; B— — The magnetic induction intensity T; D - — — — The inner diameter of the measuring tube m; v - — — The average flow velocity of conductive liquid m/s. Electromagnetic flowmeter using the above function relation that v = E/( KBD） , the actual measured values for the liquid velocity v, then the volume flow of measured medium QV = & PI; D2v / 4 calculation flow ratio of conductive fluid medium. Figure 1. 2. Measuring system of electromagnetic flowmeter is mainly composed of two parts: the flow sensor and the signal transmitter, as shown in figure 2. Sensors on the excitation coil accepting excitation current sent by the transmitter to produce a magnetic field and output induced electromotive force. Signal; Signal transmitter converts induced electromotive force signal to traffic signal or analog signal, and sends it to the control system. Electromagnetic flow meter according to the composition is divided into a and separation. Ensure that the electromagnetic flowmeter and stable operation of another important condition is grounded. When the fluid flows through the magnetic field, the conductive fluid itself is used as the reference voltage, generated in the side of the measuring tube is potential, and on the other side to produce negative potential, electric potential difference. But the electromotive force signal is usually only a few millivolts, susceptible to interference. In order to prevent interference, the reference potential as zero potential ground, to ensure that the sensor output signal accuracy and stability. Earthing terminal of the sensors and switches must be measured medium has the same potential, and to form a symmetrical input and output circuit. Figure 2, 3. System features the main characteristic of electromagnetic flowmeter is as follows: (1) with the differential pressure flow meter and different volume flowmeter, electromagnetic flowmeter no obstructions in the measuring tube, the pressure loss is small, suitable for large caliber pipe; (2) from the measured media temperature, pressure, density, viscosity parameters change, no need for calibration and compensation, only require measuring the electrical conductivity of media & sigma; > 5μ S/ cm； (3) than a wide range, the output signal is a linear relationship to flow; (4) measuring accuracy is high, can achieve & plusmn; （ 0. 1% ~ 0. 5%) ； 5. Installation requirements is low, low requirement for straight pipe before and after, generally meet & ge; 5 D before the straight pipe diameter D, & ge; After 2 D straight pipe diameter D enough; High performance/price ratio, and 6, using range is wide, lining materials and the rational selection of electrode materials can measure all kinds of corrosive medium flow. It should be noted that electromagnetic flowmeter can measure the rate of flow of a conductive medium, the medium containing gas is not suitable for measurement, this will lead to large fluctuations of measured data. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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