ResMed Astral Series Clinical Manual page 140

Cleaning and maintenance
To remove and replace the expiratory flow sensor and antibacterial filter:
Before replacing the expiratory flow sensor, turn off the device and remove mains power and/or external
battery.
1. Turn over the device and place on a soft surface (to protect the LCD screen).
2. Press and hold the eject button. Pull the cover out towards you.
3. Lift out the adapter and discard.
4. Remove the blue membrane (including the white antibacterial filter) and discard.
5. Remove and insert a new expiratory flow sensor.
6. Insert a new antibacterial filter.
7. Insert a new blue membrane ensuring the rear tab and surrounds sit flush in the enclosure.
8. Insert a new adapter, gently pushing down so it sits firmly in place.
9. Place the cover over the enclosure, ensuring the runners on the device and the cover are aligned.
Slide the cover back into place until the latch clicks.
CAUTION
Following the replacement of the Expiratory flow sensor, you must run a Learn Circuit to calibrate
the new sensor and ensure accurate therapy and monitoring.
To calibrate the Expiratory flow sensor, connect a double limb circuit. Prior to performing the Learn
Circuit, ensure double circuit is selected on the Circuit sub-menu.
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