5. Follow the instructions on the screen.
Airway gas calibration
The airway gas selection is only available on the Calibration menu
when the system detects an airway module and the module has
completed the warm up phase. See the
"Airway modules" section for
calibration instructions.
Water buildup
Small beads of water or a foggy appearance in the flow sensors is
okay. Pooled water in the flow sensors or water in the sensing lines
may cause false alarms.
Water results from exhaled gas and the chemical reaction between
CO2 and the absorbent that takes place within the absorber canister.
At lower fresh gas flows more water builds up because less gas is
scavenged and:
• More CO2 stays in the absorber to react and produce water.
• More moist, exhaled gas stays in the patient circuit and the
absorber.
How to help prevent water buildup
Suggested ways to prevent water buildup include:
• Equip systems with the optional condenser. See the "Parts"
section for information.
• Empty the water reservoir in the canister when changing the
absorbent.
• Ensure the water condensing in the breathing circuit tubes is
kept lower than the flow sensors and is not allowed to drain back
into the flow sensors.
• Water condensation in the breathing circuit tubing might be
lessened by using a Heat and Moisture Exchange (HME) filter at
the airway connection.
9 User maintenance
2067226-001 9-7
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