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I. Applications of mass flow meters: The development of mass flow meters is remarkable; liquids or gases are detected and measured as they pass through two simply vibrating flow tubes, achieving such high precision and stable performance that they are widely used. Food and beverages, natural gas, chemicals, petroleum, electricity, oil refining, metallurgy, papermaking, and other industries make extensive use of it for process control, quantity measurement, formula formulation, and oil adjustment. II. Functions of mass flow meters: 1. Multifunctionality Beyond the ability to function regardless of fluid properties and over a wide range of measurement ratios, mass flow meters also possess numerous other functions. It turns out that different products require different instruments for measurement, whereas a mass flow meter can usually measure multiple types of products. This is especially applicable to comprehensive product pipeline applications. 2. Precision and Repeatability The latest digital signal processing technologies introduced for mass flowmeters in the late 1990s helped to address the issue of zero-point stability, ensuring that these devices maintain exceptional accuracy over a wide range of measurements. Modern mass flow meters exhibit high repeatability and precision, even under fluid conditions where viscosity, density, composition, and the range ratio are constantly changing. 3. Reliability The bearingless design, lack of insertion components, and absence of seals in mass flow meters enable them to maintain their integrity over the long term with no need for maintenance. Given its high reliability, many **metering agencies have reduced the calibration requirements for it, whereas calibration is mandatory for other types of flowmeters. After understanding the performance and application areas of mass flow meters, let’s now discuss the requirements for purchasing them, so that an appropriate mass flow meter can be selected. 1. Long-term stability: Since the stability of a mass flow meter depends on the long-term stability of both the sensor unit and the transmitter, it is necessary to optimize the stability of these two components. Therefore, through multiple rounds of optimization and debugging, as well as by enhancing its stability design, the performance of the instrument will see a significant improvement. 2. Zero stability: When various external variable factors are fixed, under conditions of no flow, the zero output value of the mass flow meter will exhibit a certain range of variation over time. The lower the zero output value at this point, the better the performance of the meter. Therefore, one of the important criteria for evaluating the measurement accuracy and long-term stability of a flow meter is zero-point stability. 3. Temperature effects, medium density, and process pressure can affect the measurement accuracy of mass flow meters. Since the instrument is related to the flow coefficient, as well as the system’s structure and stiffness, the fluid being transported generates a certain amount of process pressure. This pressure affects the stiffness and structural properties of the sensitive components used in measurement, thereby impacting the accuracy with which the flow sensor can measure the mass flow rate. This can be easily understood by considering the dynamic relationships of the measurement tube.