Precautions for choosing metal tube float flowmeters

Thread Content

Issues to consider before choosing a metal tube float flow meter: 1. High-temperature resistance, with metal rotor flow meters capable of withstanding temperatures up to 450°C. Corrosion-resistant; a PTFE-lined float or Hastelloy can be used. 　　2. It is suitable for measuring the flow rates of gases, liquids, and steam with small diameters and low flow velocities. 　　3. Thanks to the magnetic coupling principle, it features no leakage and high pressure resistance. The third generation of metal tube float flowmeters has been developed; these flowmeters have cones that are formed in one step, offering high quality and an innovative design. They exhibit low pressure loss, no dead zones in the measurement tube, floats that can rotate and thus are less prone to clogging, and they are not affected by Earth’s magnetic field. 　　4. Affected by a certain viscosity, it is not suitable for measuring high-viscosity media. 　　5. When the flow rate exceeds 100 m3/h, the pressure loss is significant. 　　6. It is mainly used in instruments for process control, with a maximum accuracy of 1%, typically 1.5%, and a range ratio of 10:1. 　　7. Both intrinsically safe and flameproof types are available, suitable for hazardous industrial environments. 　　8. According to the principles, the most ideal and suitable installation method is vertical installation with flow from bottom to top. 　　9. There are various options available, including those with local pointers, battery-powered types, and two-wire powered types. 　　10. When measuring media at very low temperatures (below -30°C), a jacketed type is preferred. 　　11. Not suitable for measuring media with large density changes. 　　12. Not suitable for measuring the flow rate of pulsating media (such as at the outlet of a metering pump). 　　13. For gases, this table does not provide temperature and pressure compensation; a separate pressure gauge is required. 　　14. When multiple instruments are installed closely together, or when carbon steel process pipelines pass near the instruments, a distance of more than 100 mm should be maintained from the instruments to avoid magnetic field interference. 　　15. When measuring the flow rate of media containing a large number of ferromagnetic particles, a magnetic filter should be installed in front of the instrument, and it should be purged regularly. 16. If instruments are to be used in explosion-proof environments, round-shell M8 indicators should be selected. 17. Modular, intelligent, card-type flowmeters can also be customized according to different user requirements.