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The metal tube rotameter consists of two parts: a sensor and a converter. It converts the magnitude of the flow rate into the displacement of a float, which is then transmitted to the converter in a contactless manner. For people today, it’s no longer unfamiliar; after all, various types of flow meters are used in many fields. However, the use of metal tube rotameters is still quite limited. Many people are familiar with other types of flowmeters, but they know little about metal tube float flowmeters. In fact, metal tube rotameters are instruments with relatively high precision. However, they cannot measure fluids containing solid particles; doing so would simply cause the float to get stuck. If the medium being measured contains gases mixed in it, the results obtained from such measurements will also be inaccurate. This will certainly affect the final measurement results, and the likelihood of errors is very high. During use, only by comparing it with other flow meters can one truly appreciate the advantages of metal-tube rotameters. Additionally, various materials can be selected for their construction, a feature that is not available in many other types of flow meters. Metal tube float flow meters are unable to provide accurate measurements when measuring fluids with low flow rates, and this is due to significant leakage errors that affect the accuracy; such measurements simply cannot guarantee precision. A metal tube float flow meter uses mechanical measuring elements to divide the fluid into successive portions, aggregates the quantities measured, and can count the total number of such divisions; only by doing so can the total volume of the fluid be calculated. It can be said that other flow meters simply do not have this functionality. Since their operating principles are different, it’s inevitable that other meters cannot achieve this. Glass rotameter cannot adequately meet the needs of modern industrial production in terms of measuring the flow rates of certain high-temperature, low-temperature, and opaque fluids, as well as in transmitting automatic control signals over long distances in industrial processes. In contrast, metal-tube float meters can overcome these drawbacks, thereby expanding the range of applications for float meters.