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2.2.6 Auxiliary O2/Air System 
2.2.6.1 Auxiliary Flowmeter Monitoring Board 
The auxiliary flowmeter monitoring board is the core control part of the auxiliary flowmeter of 
the anesthesia machine. It is mainly used at a low flow of 0–15 L/min and can work 
independently. The flow sensor is welded on the board. The auxiliary flowmeter monitoring 
board controls the O2/air flow through the proportional valve, and monitors and feeds back the 
O2/air flow through the flow sensor. In addition, the auxiliary flowmeter monitoring board also 
drives the three-way valve. This board is configured with auxiliary O2/air software. 
 
Installation position of the auxiliary flowmeter monitoring board 
 
Auxiliary flowmeter monitoring board (top view) 
Auxiliary flowmeter monitoring board