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4 Tests, calibrations and utilities
Figure 4-5. Sensors on/off window
When SpO
2
, O
2
or CO
2
monitoring is disabled, the appropriate
Alarms Off message is displayed in the Alarm limits window.
4.3.3.1 Gas source: Assigning air or heliox
WARNING
A mismatch of selected and actual source gas
causes inaccurate gas delivery and volume
monitoring.
NOTE:
• The ventilator must be in standby to change the
source gas assignment.
• Use heliox of 78% (He)/ 22% (O
2
). This 78/22
mixture is recommended as this allows the maximum
amount of helium to be used while consuming less
gas when used in conjunction with a mechanical
ventilation (you can also use 80/20 and 79/21
mixtures).
• After switching between air and heliox, it is recom-
mended you calibrate the flow sensor.
• During heliox administration O
2
monitoring is
enabled and cannot be disabled.
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