Electromagnetic flow meter scale to take over the shoulder in the performance impact of eccentric and interface

Abstract: the electromagnetic flow meter scale to take over the shoulder in the performance impact of eccentric and interface information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. A preface electromagnetic flowmeter in the people impression less affected by the incident flow velocity distribution profile, and the length of the front straight pipe installation requirement is relatively low. This is due to the electromagnetic flowmeter development initial period in the 50 ~ 60 s, a small flow sensor tube. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flow meter scale to take over the shoulder in the performance of the eccentric and interface affect the article details. A preface electromagnetic flowmeter in the people impression less affected by the incident flow velocity distribution profile, and the length of the front straight pipe installation requirement is relatively low. This is because in the last century 50 ~ 60 s electromagnetic flowmeter development initial period, the small flow sensor measuring tube length is longer, itself has rise to adjust the distortion flow state for the full development, so early is not set in advance of straight pipe length requirements, and instrument accuracy is lower, the early basic common error & plusmn; （ 1. 5 ~ 2. 5) %Fs（ Full value) Flow, even if there is distortion effect also is only a fraction of a basic error, the problem is not highlighted. With the development of electromagnetic sewage flow meter diameter from the development of small and medium-sized to 1 m, domestic production has reached more than 3 m flow sensor at the same time, the design optimization of increasingly and miniaturization. Make the current electromagnetic flow sensor and pipe length between the junction surface is only diameter ( D） 1. 25 - 2. Five times the general improvement in accuracy, the basic error of & plusmn; 0. 5%R（ Measured value) , so people feel that to set up before the needs of the straight pipe length. The international organization for standardization IS09104 promulgated 1991 'closed pipeline liquid flow measurement & ndash; Liquid electromagnetic flowmeter performance evaluation method of regulation: make flow calibration connection flow meter diameter pipe diameter shall not be less than the flow sensor, shall not be greater than 3% of the sensor inner diameter; Installed in the center of the sensor electrode axis from any disturbance after at least 10 d upstream and downstream disturbance during a straight pipe in front of the 5 d, in the use of each instrument factory is a widespread rules when installation and upstream disturbance pieces & ge apart; The requirements of 5 d. Master meter method in recent years, with the real traffic flow calibration instrument, and a lot of water flow calibration device with high precision electromagnetic flowmeter standard table, their level of accuracy is usually to 0. Level 5, there are up to 0. 2 to 0. Level 3. Used as a standard table of electromagnetic flowmeter installation requirements are more strict, cannot be treated according to the requirements of the use of electromagnetic flowmeter general installation. Some instrument factory for 0. Level 3 precision instrument or regulations and the connect with a straight pipe before and after the flow sensor, combined together after calibration, if after the removal of heavy, must recalibrate. Two experimental subjects is a diameter of 50 mm electromagnetic sewage flow meter, its import pipeline connecting the three group, inner diameter is 50 mm, 55 mm and 45 mm respectively, among them 55 mm and 45 mm of imported shoulder, has more than ISO9104 regulation, connecting pipe diameter is greater than or less than 10% flow sensor inside diameter, respectively. Flow sensor tube connected to connection pipe, the center line and the center line of the pipeline is concentric respectively, vertical and horizontal two eccentric, eccentric 3 mm ( 6% of the meter diameter) 。 Electromagnetic flowmeter is change his costume or dress shape meter long measuring tube, and in the measuring tube on both ends of the horizontal and vertical direction the two 30 mm & times; 3 mm is watching window, so that the velocity distribution are measured by using laser doppler velocimeter. Sounding pipe imports rubber lining radius 7. 5 mm circular arc transition. Three discussion ( 1) Eccentric's influence on the flow measurement value eccentric to take over the level of damage the measuring tube flow velocity distribution on the electrode the centerline of the upper and lower symmetry. If part of the cover imports, the lower velocity is relatively slow, the upper part is relatively faster. If the vertical eccentric, part of the cover on the right side of the import on the right side of the velocity is relatively slow, the left relatively faster. From figure 2 connection pipe diameter and flow sensor measuring phase at the same time, positive change, eccentric error compared with concentric level eccentric time-varying into + ( 0. 1 to 0. 15) %, vertical eccentric error change is bigger, is + ( 0. 45 ~ 0. 6) %。 （ 2) Interface shoulder's influence on the flow measurement value inlet connection pipe diameter is less than the flow sensor tube inner diameter, the sudden enlargement become tube. Liquid into the measuring tube forming a flow as shown in figure 5, interface is separated from the rest of the media, it scattered and convolute into strong vortex, become a spiral vortex. With the flow downstream vortex fade, beam spread to the whole cross section. If the electrode position in the spiral vortex zone, will influence the flow measurement value. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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