A/D - electromagnetic flow meter scale Converter saturation how to deal with

Abstract: the electromagnetic flow meter scale appear A/D - Converter saturation how to deal with the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Users often from material balance, process system and the historical value comparison or with other reference flow measurement value comparison, feeling used flowmeter measurement is accurate, however instrument to check on flow standard device, with a few is error (instrument itself Such as debugging. More flow meter manufacturers choose model price quote you are welcome to inquire, here is A/D - electromagnetic flowmeter scale occurred How to deal with the article details converter saturation. Users often from material balance, process system and the historical value comparison or with other reference flow measurement value comparison, feeling used flowmeter measurement is accurate, however instrument to check on flow standard device, with a few is error (instrument itself Such as debugging setting error) Outside that most of the instrument is normal. The reason most often belongs to the instrument installation medium and the pipe with mixed with interphase ( If there is condensation in the gas liquid droplets, in bubbles in the liquid) From the aspects such as the error. 1 bad installation. Class 1 1 installation wrong bad installation, improper operation and arrangement of the common are: 1) Standard orifice of the acute Angle is not welcomed in flow. 2) Sealing gasket between instrument and pipeline diameter Dg is less than the pipe diameter Dp and meter diameter Dm beam. Dg should be slightly bigger than the Dm, such as Dg3) Eccentric sealing gasket ( Misalignment center) 。 Sealing gasket installation eccentric, cover some of the circulation area, make the velocity distribution asymmetry of serious distortion. Due to the asymmetric flow occurred in the flow sensor imports, the length of straight pipe upstream is zero, the differential pressure type, turbine, and vortex street type, ultrasonic type, target type, such as electromagnetic instrument measurement error. For example DN50mm electromagnetic flowmeter liner eccentric 10 mm, the measurement error is as high as 4% ~ 10%. 4) The meter is in the wrong direction of flow. 5) Will be for vibration interference are sensitive instrument installed in vibration of the pipes. 6) Lack the necessary protective accessories. These defects are well known or instrument factory should be avoided. By operating personnel without strict training, however, lack of knowledge and did not pay more attention to this kind of mistake. Eccentric sealing gasket inside diameter is too small or install while on the displacement, the float type, coriolis mass type instrument, such as flow value has no effect or little effect, but may increase the risk of additional pressure loss. 1. 2 2 class 1 bad installation. 2. 1 upstream disturbance source in the upper reaches of disturbance source has a spiral weld pipe and all kinds of choke pipe fittings ( Such as elbow, reducer, pipe and valve) , as shown in figure 1 [ 2] 。 By disturbance flow type is divided into two categories, category 1 velocity distribution have distortion and secondary flow; 2 class except velocity distribution distortion and secondary flow and vortex. All kinds of pipe fittings in zui is bent pipe and all kinds of pipe bending combination ( As the plane double bend and solid double bend) 。 All kinds of flow meters to upstream flow disturbance sensitivity is differ, so to put forward their own installation requirements. Figure 1 depending on the type of disturbance flow classification of various kinds of pipe fittings in all kinds of flow meters, throttle differential pressure meter test of throttling a length of straight pipe upstream and downstream requirements do zui to perfect, typical choke a more mature results have been made in the international standard ISO5167 rules. Other kinds of flow meters has yet to reach the level of mature; Whether standard specification or manufacturing operation instruction, are not as good as the throttle differential pressure type flow meter is perfect, sometimes only a reference. Same breed instrument due to the different structures, the influence degree of difference is very big also. Such as turbine meter turbine spiral blade than flat blade under the influence of swirling flow is much smaller; Travel time method ultrasonic flowmeter in V method track layout influenced by a vortex flow is smaller than Z method. 1. 2. 2 downstream disturbance source usually after the idea that once the fluid flow meter won't influence on the flow of the instrument, is only an illusion. Bent pipe, valve and so on, in fact, disturbance on the formation fluid flow is transmitted back, can affect the distance of a few times the length of pipe diameter. In most cases, 5 times the pipe diameter downstream straight pipe is enough; Some exception may be a bit longer, but can think 10 times the diameter of the downstream straight pipe, can reliably handle any downstream pipe produced by the disturbance. Such as the straight pipe length can't meet the requirements and to ensure the accuracy of measurement, one can take the following two workarounds. 1) Under the condition of on-site installation calibration, or in the same site installation conditions of flow disturbance resistance together with the instrument, the real flow calibration device calibration in the laboratory.

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