Electromagnetic flow meter scale excitation way how what type installation

Abstract: the electromagnetic flow meter scale excitation way what how to selection installation information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter is mainly used for measuring the conductive liquid medium, and cannot be used for measuring gas, steam and liquid contains a lot of gas. Affected by the velocity distribution, under the condition of axial symmetry distribution, traffic signal is proportional to the average flow velocity. So, the electromagnetic flowmeter. More flow meter manufacturers choose model price quote you are welcome to inquire, here is how electromagnetic flowmeter scale excitation way what selection installation article details. Electromagnetic flowmeter is mainly used for measuring the conductive liquid medium, and cannot be used for measuring gas, steam and liquid contains a lot of gas. Affected by the velocity distribution, under the condition of axial symmetry distribution, traffic signal is proportional to the average flow velocity. So, before and after the electromagnetic flowmeter must also have a certain length of straight pipe before and after. The influence of electromagnetic interference vulnerable to the outside world. In the use of the effect is influenced by many factors. True, reliable, and its accuracy of measurement in addition to related to the converter, more mainly depends on the sensor, the sensor of the excitation technique had a great influence on traffic detection. What are characteristics of electromagnetic flowmeter: ( 1) Simple structure, no moving parts and hinder the perturbation of the measured medium flow or throttling parts, for easy adhesion and solid-liquid two phase medium such as blockage, abrasion problem. Can make up for the inadequacy of mass flowmeter is not easy to measure this medium. ( 2) Electromagnetic flowmeter is a kind of measuring volume flow meter, its measurement is not affected by the density of the fluid, temperature, pressure, viscosity, Reynolds number and the influence of conductivity changes within a certain scope. Electromagnetic flowmeter only water as a test medium for calibration, without the need for additional amendment can be used to measure other conductive liquid. This is what other meter does not have advantages. ( 3) Electromagnetic flowmeter measurement range is very large, some product range up to 1000:1. On the same caliber sensor, and its full scale as long as the medium velocity in 0. 3 ~ 15 m/s range can be set freely. Electromagnetic flowmeter measurement range can cover the turbulent and laminar flow of two kinds of velocity distribution state and the differential pressure flow meter, turbine, and vortex street flowmeter can not be compared to. ( 4) On the measuring principle is linear, high measurement accuracy, and completely electrical signal output, a reflection of measuring speed, measurable pulsating flow and rapid accumulation amount. ( 5) Good corrosion resistance. ( 6) In principle is measured average flow velocity distribution in the cross section of the water, the velocity distribution requirements is low. Therefore, sensor straight pipe before and after the request flow meter shorter than others. ( 7) Is measurable, the fluid flow in two directions. Electromagnetic flowmeter excitation method: dc excitation of the last century, European countries have developed with dc excitation electromagnetic flowmeter, and began its industrial application. Dc excitation technology is the use of permanent magnets or dc power supply for electromagnetic flow sensor field winding of power supply, in order to form a constant excitation magnetic field, as shown in figure 1. Dc excitation technology zui big problem is dc induction electromotive force in both positive and negative polarity of the electrode is formed on the surface of the fixed, caused by current electrolytic medium body, lead to the electrode surface polarization phenomenon. In order to eliminate the electrode polarization effect in dc excitation ills, such as in the next few decades, the developed countries and put forward the recruitment frequency sine wave excitation, as shown in figure 2. Is the use of power frequency 50 hz sine wave power supply for electromagnetic flow sensor field winding power supply. Its main characteristic is to basically eliminate the surface of the electrode polarization phenomenon, reduce the effects of electrode electrochemical potential and the internal impedance of the transducer. However, power frequency sine wave excitation technology will bring a series of electromagnetic interference and noise. Seven of the last century, generations of paper industry in China in eighty in domestic electromagnetic flowmeter, found that the electromagnetic flowmeter often appear unstable zero and values. Strict grounding and away from electromagnetic interference source cannot be completely solved, influenced the production. This related to the weakness of power frequency excitation. Low-frequency rectangular wave excitation: in order to thoroughly solve the problem of electromagnetic flow 'frequency interference, improve the flow measurement precision, between dc excitation and power frequency ac excitation of low-frequency rectangular wave excitation technology was put forward. The excitation technique, as shown in figure 3, already has a dc excitation technology does not produce eddy current effect, transformer effect ( Orthogonal interference) Characteristics, but also has basic does not produce polarization effect power frequency sine wave excitation, facilitate the amplified signal processing, and can avoid dc amplifier zero drift, noise, stability, etc, the advantages of and has good anti-jamming performance, are widely used in the electromagnetic flow meter. Due to the rectangular wave excitation of these advantages, in the eighty s, with the introduction of the excitation technology joint venture products has been widely used. Dual frequency rectangular wave excitation, the late 1980 s of foreign manufacturers introduced dual-frequency rectangular wave excitation technology.

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