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Preparatory work should be done before selecting a mass flow meter, such as determining the name of the fluid and its properties (corrosivity, viscosity, abrasiveness, etc.)； Operating flow rate (normal flow, maximum flow, minimum flow) ； Working pressure (maximum, minimum working pressure) ； Special attention should be paid to the formation of negative pressure, operating temperature (maximum and minimum temperatures), and the electrical conductivity of the fluid ； It is required to have a certain level of electrical conductivity, with a conductivity of ≥5 μS/cm ； Installation location, power supply method, process pipeline dimensions, communication method with the control room, etc. Different mass flow meters have various factors to consider when selecting them; the choice should be made based on their specific functions and performance characteristics. Mass flow meters are widely used in industries such as petrochemicals. Thermal (gas) mass flow meters are suitable for measuring single gases and multi-component gases in fixed proportions ； Selection of ultrasonic flowmeters – At present, in China, they can only be used to measure fluids at temperatures below 200°C. Flow measurement challenges for highly corrosive, non-conductive, radioactive, and flammable/explosive media ； Turbine flowmeters are mainly used for measuring the following substances: oil, organic liquids, inorganic liquids, liquefied gas, natural gas, certain gases, and cryogenic fluids. Each type of flow meter has its own unique advantages and disadvantages; the appropriate model should be chosen based on different measurement methods and structures, as well as the required measurement procedures, usage methods, and operating conditions.