Large caliber vortex flowmeter

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What are the corresponding sizes of various specifications of vortex flowmeters? The size specifications of vortex flowmeters may vary depending on different manufacturers and models. Generally speaking, nominal diameters ranging from DN15 to DN600 or even larger are covered. For vortex flowmeters with smaller diameters such as DN15-DN50, the overall length is relatively short, usually around 150-300mm, and the height and width are also relatively small. Li Huai is suitable for smaller pipeline installation spaces, and its flange size meets the corresponding national standards, making it easy to connect with pipelines. The length of the circular DN80-DN200 vortex flowmeter is approximately in the range of 300-600mm. As the diameter increases, the length, height, and width will also increase accordingly to ensure measurement stability and accuracy. The flange size is also increased according to the standard to match larger diameter pipelines. When the nominal diameter reaches DN250-DN600 and above, the size further increases, and the length may be around 600-1500mm. The overall shape is larger to meet the needs of high flow measurement, and the installation flange and other connecting components are also compatible with large-diameter pipelines. In practical applications, when selecting a vortex flowmeter, it is necessary to determine the most suitable size specifications based on specific factors such as pipeline diameter, installation environment, and process requirements, and refer to the detailed product specification manual provided by the manufacturer to ensure smooth installation and use.

2. One of the reasons for the large fluctuation of vortex flowmeters and improvement methods

One of the reaso

ns for the large fluctuation of vortex flowmeters is that when the large-diameter instrument is at the lower limit flow rate, due to the small obstruction of the medium (relative to the vortex), the flow velocity is fast, resulting in a smaller number of pulses generated when 1 cubic meter of medium passes through (i.e., a smaller instrument coefficient), and the final result is a lower resolution.

. This is an inherent characteristic of vortex flowmeters, especially at the lower limit flow rate of large diameter instruments, which may exhibit large fluctuations and unstable values. Improvement method: Extend measurement time: By extending the measurement time, the cumulative number of pulses can be increased, thereby improving the stability and accuracy of the measurement. For example, extending the measurement time from 1 second to 10 seconds or longer can significantly reduce the fluctuation range of flow. However, it should be noted that excessively long measurement times may affect the real-time performance of the system. Measurement using the cycle measurement method: The cycle measurement method calculates the flow rate by measuring the period of the pulse, which is more sensitive to low-frequency signals. Setting the frequency of the weekly measurement base at a higher level (such as above 1000Hz) can ensure stable measurement results even at low flow rates. However, it should be noted that the weekly measurement method requires multiple software filters to reduce flow fluctuations and may result in insufficient tracking speed. Measurement using frequency doubling method: The frequency doubling method amplifies the vortex frequency through a frequency doubler to increase the number of pulses. For example, doub

2. One of the reasons for the large fluctuation of vortex flowmeters and improvement methods

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