5-14
For the anesthesia machine configured with the function of Drive Gas Auto Switch, there will be a
[Drive Gas Valve] button added under the [PPEP Valve D/A] button in this menu.
After setting relevant items, check the A/D value and actual value in the valve test table on the
right to judge whether the test item is accurately controlled. The A/D value is significant for zero
verification. When no air flows through the sensor (for example, obstruct the air source, stop the
fresh air flow, or enter standby mode), the displayed A/D value is the present zero value. When
there is no offset at zero, the actual value shall be 0.
However, if offset occurs to the sensor zero point, the actual value displayed is not always 0. In
this case, zero calibration is required to adjust the measured value to 0. The ranges of zero point
AD value of each sensor are as follows:
Name of sensors The ranges of zero point AD
value
internal flow sensor 1699-16768
inspiratory flow sensor 554-26457
expiratory flow sensor 1392-19306
airway pressure sensor 7432-16206
PEEP pressure sensor 7432-16206
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