The main factors causing the measurement error of the precession vortex flowmeter

Abstract: The information on the main factors causing the measurement error of the precession vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Precession vortex flowmeter is a new generation of flowmeter that integrates the functions of flow, temperature and pressure detection, and can perform automatic compensation of temperature, pressure and compression factor. Directly detect the standard volume flow and standard volume total of the gas. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the main factors that cause the measurement error of the precession vortex flowmeter. The details of the article. Precession vortex flowmeter is a new generation of flowmeter that integrates flow, temperature and pressure detection functions, and can automatically compensate for temperature, pressure and compression factor. Directly detect the standard volume flow and standard volume total of the gas. Because it has no mechanical rotating parts, is not easy to corrode, has high reliability, good stability, and requires no maintenance for long-term work, it has been widely used in various metering stations of the world's largest natural gas production and sales plants. However, due to the difference in natural gas gas quality in the pipeline, changes in operating conditions and errors caused by other factors, the measurement accuracy of the intelligent precession vortex flowmeter is reduced. Therefore, it is of great significance to find out the cause of the measurement error of the flowmeter, to propose improvement measures, and to make a detailed plan for improving the measurement accuracy of natural gas. 1. Working principle of precession vortex flowmeter The intelligent precession vortex flowmeter belongs to the velocity type measuring instrument. The fluid entering the flowmeter generates a vortex flow through the vortex generator. The vortex flow precesses in the venturi, and the sudden throttling when it reaches the constriction section is the acceleration of the vortex flow. When the vortex flow enters the diffusion section, it is forced to enter the precession secondary rotation due to the action of the backflow. The frequency of the vortex flow is proportional to the medium speed and has a linear relationship. It is detected by the pressure sensor, and the detected weak electrical signal can be converted after processing. is the flow signal. 2. The main factors that cause the measurement error of the flowmeter The factors that cause the error of the flowmeter, and the error caused by the measuring instrument (flow range, pressure change, straight pipe section factors). Errors caused by changes in use conditions (mechanical vibration, impurities in the medium, electromagnetic interference), etc. Therefore, in the process of rotating the vortex flowmeter, it must be considered whether these factors affect the normal operation of the flowmeter. 2.1 Measuring instrument errors such as: the influence of the flow range. Each specification of the flow meter has its flow range. When the medium flow is lower than the lower flow limit of the instrument, if the flow rate of the medium is too low, the flow rate cannot be detected, and the accuracy cannot be guaranteed; and when the flow rate is higher than the upper flow limit of the instrument. The pressure loss of TDS precession flowmeter is too large. Loss of pulses, meter leakage and other phenomena will occur, and the accuracy of the flowmeter cannot be guaranteed. In addition, due to the particularity of gas field development. Generally, in the early stage of development, the gas volume is large and the pressure is high, and in the later stage of development. The gas volume is constantly decreasing and the pressure is decreasing, so the turndown ratio of the flowmeter is a very critical factor. Another example: the impact of pressure changes. The accurate detection of pressure plays a decisive role in the accurate measurement of natural gas, especially to reduce relative errors. For an accuracy of ± 0.5%FS (full scale accuracy). The pressure sensor with a range of 0.5Mpa has a maximum measurement error of 0.5Mpa'x 0,5%=±2.5kPa; and when detecting the medium pressure of 200kPa. Its maximum relative error is±2.5kPa/200×100%=±1.25%. It can be seen that as the detection pressure increases, the relative error becomes smaller and smaller. There will always be errors of one kind or another in operation. Inadequate operation, lax management and other factors will also cause large measurement errors; in the place where the flowmeter is installed, in order to facilitate maintenance, there is generally a bypass process. If the bypass gate is not tightly closed or there is internal leakage, it will It will cause a large measurement error; if the flowmeter is not calibrated on time, the floating of the relevant parameters will also cause a large measurement error. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The main factors causing the measurement error of the precession vortex flowmeter'

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