Air flow meter
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For a pipe with a diameter of DN600 and a maximum air flow rate of 20,000 m3/h, what type of flow meter should be used to be able to measure air flow rates in the range of 1,000–2,000 m3/h?
You can try the FOX thermal gas mass flow meter
For measuring air flow in large-diameter pipes, thermal methods are generally used; however, the specific range ratio can be consulted with the manufacturer
Thermal, Anubaa, ultrasonic, and so on are all available