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Can an air flowmeter be used as a hydrogen flowmeter?
The air flowmeter cannot be used as a hydrogen flowmeter.

Or are you talking about MFC? The mass flow controller is a thermal distributed gas mass flow controller, which can be used as a hydrogen flowmeter. Firstly, air is reduced to nitrogen according to the gas conversion coefficient, and then converted to hydrogen according to the coefficient. This is the range of the hydrogen flowmeter you need.