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For glass rotameters, the fluid to be measured flows from bottom to top through a conical glass tube; this creates a pressure difference between the upper and lower parts of the float, causing the float to rise due to this pressure difference. The float is in an equilibrium position when this upward force, the buoyant force acting on the float, and the viscous lift are equal to the weight of the float. Therefore, there is a certain proportional relationship between the flow rate of the fluid passing through the glass rotameter and the rising height of the float, that is, with the flow area of the glass rotameter; the position height of the float can be used as a measure of flow rate. Next, Chengfeng Instruments will explain to you the application areas of glass rotor flowmeters. http://images.glass.cn/news/201904/6a9fe29d80284e41b7814214efe784a7.jpg I. Industrial production processes Flow meters are one of the main categories of instruments used in process automation systems. They are widely applied in various sectors of the national economy, including metallurgy, power generation, coal mining, chemicals, petroleum, transportation, construction, light industry and textiles, food processing, pharmaceuticals, agriculture, environmental protection, as well as people’s daily lives. They serve as important tools for developing industrial and agricultural production, saving energy, improving product quality, and enhancing economic efficiency and management levels; thus, they hold a significant role in the national economy. In process automation instruments and devices, flow meters serve two main functions: as sensing instruments in process automation control systems, and as instruments for measuring the total amount of material. II. Energy Metering Energy is classified into primary energy sources (coal, crude oil, coalbed methane, petroleum gas, and natural gas), secondary energy sources (electricity, coke, synthetic gas, refined oil products, liquefied petroleum gas, steam), and energy-carrying media (compressed air, oxygen, nitrogen, hydrogen, water), among others. Energy metering is an important means for the scientific management of energy, achieving energy savings and cost reduction, as well as improving economic efficiency. Flow meters are an important part of energy measurement instruments. A vast number of flow meters are used for common energy sources such as water, city gas, natural gas, steam, and oils; they are essential tools for energy management and economic accounting. //data/attachment/forum/202003/31/133956csr99x9bx9wxnb8u.jpg.thumb.jpg /data/attachment/forum/202003/31/133956csr99x9bx9wxnb8u.jpg.thumb.jpg III. Environmental protection projects The emission of smoke, waste liquids, and sewage severely pollutes the atmosphere and water resources, posing a serious threat to the human living environment. **With sustainable development designated as a national policy, environmental protection will be the greatest challenge of the 21st century. To control air and water pollution, management needs to be strengthened, and the basis of such management is the quantitative control of pollution levels. Our country relies on coal as its primary energy source, and there are millions of chimneys across the country that continuously release smoke into the atmosphere. Flue gas emission control is an important measure for eliminating pollution; every chimney must be equipped with flue gas analysis instruments and flow meters to form a comprehensive emission monitoring system. It is very difficult to measure the flow rate of flue gas, and the challenges include large and irregular chimney sizes, variable gas compositions, a wide range of flow speeds, contamination, dust, corrosion, high temperatures, and the absence of straight sections in the pipeline. IV. Transportation There are five modes: rail and road, air, water, and pipeline transportation. Among these, pipeline transportation has existed for a long time, but its use is not widespread. With the growing prominence of environmental issues, the characteristics of pipeline transportation have attracted attention. Pipeline transportation must be equipped with flow meters, which serve as the eyes for control, distribution, and scheduling, as well as essential tools for safety monitoring and economic accounting. V. Biotechnology The 21st century will be the century of life sciences, and industries characterized by biotechnology will experience rapid development. There are many substances that need to be monitored and measured in biotechnology, such as blood and urine. Instrument development is extremely difficult and comes in a wide variety of types. VI. Scientific Experiments Scientific experiments require a large number of flowmeters, and these instruments come in an extremely wide variety of types. According to statistics, a large proportion of the more than 100 types of flow meters are used for research purposes; they are not produced in bulk for sale on the market. Many research institutions and large companies have dedicated teams working on the development of specialized flow meters. VII. Marine meteorology, rivers and lakes In these areas, where the flow path is open, it is generally necessary to measure the flow velocity in order to calculate the flow rate. The physical principles and fluid dynamics fundamentals on which flow meters and volumetric flow meters are based are the same, but there are significant differences in their operating principles, structure, and usage conditions.