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Hi, I’m the Industrial Control Assistant. Previously, I explained the principle of mass flow meters and electromagnetic flow meters, as well as the installation and principles of vortex flow meters. So, do you know how to select a vortex flow meter? Let’s talk about it today. Vortex flowmeters are widely used in industries such as petroleum, chemicals, metallurgy, power plants, and oil and gas; it is evident that the demand from these sectors accounts for around 90% of the total market for flowmeters. Domestic flow meters are mainly classified into: vortex flow meters, turbine flow meters, and electromagnetic flow meters. Vortex flow meter accuracy: 0.5%, 1.0%, 1.5%, with no zero drift ； The accuracy of turbine flowmeters is 0.2 class, 0.5 class, and 1.0 class ； Turbine flowmeters with no zero drift, strong interference resistance, and short-term repeatability of 0.05%–0.2%; domestic brands have achieved precision levels on par with international standards, reaching 0.04% ； Repeatability can achieve a stability of 0.01%. The accuracy class of the electromagnetic flowmeter is 0.2–0.25 ； Maximum allowable error: ±0.2%–0.25% ； For accuracy classes of 1.0–1.5, the maximum allowable error is ±1.0%–1.5%; the repeatability of the flow meter must not exceed 1/3 of the absolute value of the maximum allowable error specified for that accuracy class. Therefore, across various sectors, domestic flowmeters have gained competitive strength through years of research and development; thanks to the concerted technical efforts of various companies, the differences between them and imported foreign products are gradually diminishing. In the future, domestic vortex flowmeters will definitely have the capability to replace imported brands, and may even surpass them in terms of both technology and performance. The development of flow meters in China is truly promising, and there are an immense number of brands of vortex flow meters available in the country. According to incomplete statistics, alone in Shanghai, there are over 900 manufacturers of flow meters. The selection of vortex flow meters is a topic of great interest; once the type of flow sensor has been chosen, it becomes crucial to decide on the specifications of the vortex flow meter as well as the appropriate auxiliary components. Two basic principles should be adhered to during the selection process: ensuring usage accuracy and ensuring production safety. To achieve this, three selection parameters must be determined, namely the typical instantaneous flow rates for short and long terms, the design pressure of the medium being measured, and the operating pressure. II. Calibration before use: On the one hand, this is due to the various difficulties currently associated with on-site calibration of such flow sensors. That’s all for this issue. Wishing everyone a pleasant weekend in advance!