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7.3.4 Pressure and Flow Zeroing (Service)
7.3.4.1 Zeroing Mechanisms
The anesthesia machine automatically performs pressure and flow zeroing at regular intervals
during operation. You can also perform pressure and flow zeroing manually in the factory
maintenance menu. Manual zeroing can immediately eliminate measurement deviations caused by
zero offset of sensors. The anesthesia machine supports automatic and periodic pressure and flow
zeroing. The first four zeroing operations are done automatically 1, 5, 15, 30, and 60 minutes after
ventilation starts. Then automatic zeroing takes place every 60 minutes. The three-way valve is
opened and closed for valve flushing during mechanical ventilation and before automatic zeroing.
7.3.4.2 Zeroing Procedure
Zero the pressure and flow sensors as follows:
1. Select [Setting] > [Maintenance] > [Calibrate] > [Zero Sensor] to go to the screen as
shown in the following figure:
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