Analysis on the Causes of Large Actual Measurement Errors of Various Flow Meters

Abstract: The analysis information of the reasons for the large actual measurement errors of various flowmeters is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. During the use of the flowmeter, it is often judged whether the flowmeter measurement is accurate by comparing the previous flowmeter measurement or other parameter flow measurement, but the flowmeter is calibrated on the flow specification equipment, except for a few of the flowmeter itself. For more flow meter manufacturers to select models and price quotations, you are welcome to inquire. The following is the detailed analysis of the reasons for the large actual measurement errors of various flow meters. During the use of the flowmeter, it is often judged whether the flowmeter measurement is accurate from the previous flowmeter measurement or the flow measurement of other parameters. In addition to debugging settings fault), the actual field proved that most of the flow meters are working normally. The measurement error factors are generally caused by improper installation of the flowmeter equipment and the mixing of different phases in the medium in the pipeline (such as condensed droplets in the gas, and bubbles mixed in the liquid), which constitute errors in application. The most common types of flowmeters are improper operation and improper installation: the acute angle of the standard orifice plate is not installed on the upstream surface. 2) The inner diameter Dg of the sealing gasket between the surface and the pipeline is smaller than the inner diameter Dp of the pipeline and the inner diameter Dm of the surface, resulting in a beam flow. Dg should be slightly larger than Dm, eg Dg3) The gasket is offset from the misaligned base. The gasket device is offset, obscuring some of the flow area, making the velocity distribution severely distorted and asymmetric. Because the asymmetric movement occurs at the inlet of the flow sensor, that is, the length of the upstream straight pipe section is zero, it will bring measurement errors to the surfaces of differential pressure, turbine, vortex, ultrasonic, target, and electromagnetic. For example, the DN50mm electromagnetic flowmeter liner deviates from 10mm, and the measurement error is as high as 4% to 10%. 4) The flowmeter is in the wrong fluid direction. 5) Install the flowmeter sensitive to vibration disturbance on the pipeline with vibration. 6) Lack of necessary protective accessories. These shortcomings are well known or suggested by the appearance manufacturer to be prevented. However, because the operators have not been strictly trained and lack common sense, they have not been paid attention to, and such mistakes have emerged one after another. Too small inner diameter of gasket or equipment deviation will add rated pressure loss although it has no or minimal effect on the flow value of positive displacement, float, Coriolis mass, etc. surface. The upstream disturbance source of the second type of flowmeter: the upstream disturbance sources include spiral welded seam pipes and various types of blocking pipe fittings (such as elbows, reducers, branch pipes and valves). According to the type of disturbance flow, it is divided into two categories, the first category has velocity dispersion distortion and secondary activity; the second category has vortex in addition to velocity dispersion distortion and secondary activity. The most common types of pipe fittings are elbows and various combinations of elbows (like flat double elbows and three-dimensional double elbows). Various types of traffic surfaces have different degrees of sensitivity to disturbances in upstream activity, so their own device requests are made. Various pipe fittings classified according to the type of turbulent flow. Among all kinds of flow surfaces, the differential pressure-saving type is the most perfect for the experiment of saving the length of the upper and lower straight pipe sections of the saving piece. The rules are made in ISO5167. Other types of flow meters have not yet reached such a sophisticated level; whether it is the specification or the data provided by the manufacturer's operating instructions, it is not as complete as the differential pressure flow meter, and sometimes it can only serve as a reference. Common flowmeter boutique display: The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of the Causes of Large Actual Measurement Errors of Various Flow Meters'

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