What are the measurement ranges of DN40 vortex flowmeter?

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Why is the single tube flow measurement range large, while the main tube flow meter range is small? In many enterprises process pipelines, there are a large number of phenomena where the actual flow rate or flow velocity of the fluid is low. The existence of this phenomenon can be attributed to the following reasons: firstly, reducing the flow velocity can reduce the pressure loss in the fluid flow, reduce the driving power, and save energy; Secondly, considering future development and expanding the scale, sufficient margin should be left in the design to make the process pipelines larger; Thirdly, some pipelines have high working pressure, and although the flow rate is not small, the flow velocity is low. Due to the existence of "large pipe diameter, small flow rate" or "large pipe diameter, low flow velocity with age", it poses a challenge for the selection of velocity flow meters. A certain enterprise, a DN300 water pipeline, originally installed orifice flow meters and industrial water meters, but due to the small flow rate, both instruments almost did not indicate. After on-site verification of the water equipment, the sum of the maximum water consumption of several water equipment is less than 80m3/h, while the minimum flow rate is only 18m3/h. At maximum flow rate, the lower limit flow velocity of DN300 flowmeter is less than 0.1m/s. Therefore, it is recommended to reduce the diameter of the on-site process pipeline from DN300 to DN100 and use a DN100 vortex flowmeter. After installation, it meets both the upper limit and lower limit of water usage for foolish shouting. For example, a heating furnace for producing high-pressure porcelain bottles requires a natural gas volume of 1200Nm3/h (101.325kPa, 20 ℃) for the heating stage and 150Nm3/h for the insulation stage. The diameter of the measuring main pipe is DN80, the working pressure is 0.3MPa, and the temperature is 25 ℃. The original orifice flowmeter was selected, but due to the inability to meet the flow range requirements, a vortex flowmeter was chosen instead. When selecting the table, the standard flow rate is converted to the operating flow rate using the gas equation. The converted operating flow rate range is 38.5-308m3/h. Within this flow range, if the N80 vortex flowmeter is selected according to the original process pipeline, the upper limit is not a problem, but the lower limit cannot meet the requirements. If a DN50 vortex flowmeter is selected, both the upper and lower limit flow rates can meet the requirements. In practice, using DN50 instead of shrink tubing has achieved good results. Although vortex flowmeters have a wide range, their lower limit flow rate cannot be too low. In general, the lower limit flow rate for measuring liquids is 0.3-0.5m/s; When measuring gas, the lower limit flow rate is 3-5 m/s. On many sites, the minimum flow velocity inside the process pipeline is much lower than the above values. To meet the measurement requirements, it is necessary to shrink the process pipelines on site. There are a large number of similar problems on site, and pipe shrinkage can effectively solve practical flow measurement problems. However, pipe shrinkage also adds trouble for customers. Some customers do not have ready-made pipes, and purchasing a suitable pipe requires a lot of effort, as well as increasing installation workload and costs. If the manufacturer provides the reduced diameter vortex flowmeter directly to the customer based on the flow parame

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