Performance comparison of gas turbine flowmeters, gas rotameter, and swirl vortex flowmeters

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　　Gas turbine flowmeters, gas rotameter flowmeters, and vortex swirl flowmeters are considered to be relatively accurate and stable instruments for measuring gas flow. They are widely used for measuring natural gas, compressed air, carbon dioxide, and other gases. But when making a purchase, which of these flowmeters should a particular user choose? Below, we analyze and compare the advantages of each of these three types of flowmeters based on their working principles, operating conditions, and cost-effectiveness, to help users select the most suitable flowmeter for their needs. 　　Working principle: Gas turbine flow meter – The gas flowing through the flow meter causes the turbine blades to rotate; the number of rotations of the impeller is proportional to the volume of gas that passes through the meter, and the gas flow rate is determined using an integrated circuit. Gas Rotameter – A rotameter uses mechanical measuring elements to divide the fluid into consecutive, known-volume segments, and measures the total volume of fluid by counting how many times each segment is filled and emptied in sequence. 　　Vortex flow meter: As the fluid passes through a vortex generator composed of spiral-shaped vanes, it is forced to rotate violently around the axis of the generator, thus forming vortices. When the fluid enters the diffusion section, the vortex flow is affected by the backflow and begins to rotate twice, resulting in a gyroscopic vortex precession phenomenon. This precession frequency is proportional to the flow rate, which is used to calculate the gas flow volume. 　　From the working principles of these three types of flow meters, it can be seen that although their principles differ, all of them calculate the gas flow rate based on physical principles and then convert this value into a numerical figure that can be measured. These three measurement principles have been widely used in the flow meter industry. 　　Limited use 　Gas turbine flowmeters: Can only measure gases with few impurities and no moisture, such as natural gas. A straight pipe section of 10DN in length is required before and after installation. 　　Gas Roots flow meter: It can only measure gases with few impurities and no moisture, such as natural gas. No long straight sections are required during installation, nor is it necessary to avoid installing it near valves or elbows; however, it must be installed vertically. The rotameter can measure gases that contain moisture, such as biogas, compressed air, natural gas, etc. A straight pipe section of 10DN in length is required before and after installation. 　　Cost-performance analysis: Gas turbine flowmeters: They have a high price and are suitable for high-precision gas measurement in applications such as trade settlement, for gases like natural gas. 　　Gas Roots flow meter: It has a higher price and is suitable for high-precision gas measurement in applications such as trade settlement; it has a long service life and is appropriate for measuring natural gas and similar gases. 　　Rotating vortex flowmeter: It has a moderate price, is suitable for measuring gas flow rates for internal monitoring, can measure gases containing moisture, has a long service life, and is appropriate for use with natural gas, biogas, compressed air, etc. 　　Based on a simple and easy-to-understand analysis of these three types of flowmeters, along with their operating flow range, it is possible to select the appropriate flowmeter quite easily without any specialized knowledge of instruments. 　　As a highly precise instrument, a flow meter requires strict adherence to its specifications not only during manufacturing and use, but also requires special attention during maintenance in order to prevent it from reaching the end of its useful life prematurely.