Troubleshooting Anesthetic Gases and O
2
Concentration Monitoring
7 - 10 Operator’s Manual of Anesthesia System
NOTE: Inaccuracy is specified at 10-55 °C operating temperature and default
compensated for an H
2
O partial pressure of 11 mBar (i e 22 °C @40% RH
ambient conditions) and using a DRYLINE
TM
sampling system. Any
other ambient H
2
O partial pressure will dilute the gas sample to a
different extent, causing a measurement error. Under typical operating
conditions this effect is negligible. An increase of the ambient H
2
O
partial pressure to 30 mBar (i e 28 °C @80% RH or 33 °C @60% RH) will
cause a general error for all measured gases of -2%
REL
. For automatic
compensation of the ambient humidity effect on the gas sample
composition, the actual ambient H
2
O partial pressure can be input to
AION
TM
from the host via the communication interface.
7.9 Troubleshooting
If the gas inlet (including watertrap, sampling tube and airway adapter) is occluded by condensed
water, airway occlusion will be prompted on the screen.
To remove the occlusion:
• Check the airway adapter for occlusion and replace it if necessary.
• Check the sampling tube for occlusion or kinking and replace it if necessary.
• Check the watertrap for water accumulation. Empty the watertrap. If the problem persists,
replace the watertrap.
If the problem persists, internal occlusions may exist. Contact your service personnel.
If the exhaled O
2
concentration is higher than the inhaled O
2
concentration, it may be because of an
overly low pump rate. It is recommended to set [Pump Rate] to [High].
7.10 Sample Gas Recirculation
Figure 7-6 Sample gas recirculation
To return the sample gas to the patient circuit, plug the exhaust tube into the sample gas return port
marked . A click indicates that the connector of the exhaust tube is installed in place, as shown
above. Depress the metal clip to pull out the exhaust tube.
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