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Pump rotation frequency is not fixed, because there is constant current control circuit in the module, when the pipe slightly jammed, the flow becomes smaller, the system detects flow decreases, it will enhance the speed of the pump, so that the level of air flow comes back to pre-set level (our embedded module C002A defaults flow rate at 100ml/min), you can send commands from the PC to change it within the range 50-250ml/min)
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