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Under what circumstances do you use mass flow meters and when do you use mass flow controllers?

In general, mass flow meters are used when measuring or monitoring only the flow rate; mass flow controllers are used when the flow rate needs to be controlled. For some measurement occasions, both can be used, such as the capillary flow capacity measurement, when the constant pressure measurement, use mass flow meter; When the constant flow pressure measurement, the need for mass flow controller. Note that when the mass flow controller is in the cleaning state, it can also be used as a mass flow meter, except that the pressure drop is larger than the normal mass flow meter.

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