Accessories
38
To remove supplemental oxygen:
1. Unlock the low flow oxygen inlet at the rear of the device by pushing up on the locking clip.
2. Remove the oxygen port connector from the low flow oxygen inlet.
Monitoring delivered oxygen
The FiO
2
sensor is a standard inclusion on the Astral 150 and an optional accessory on the Astral 100.
The sensor measures the average of percentage of oxygen delivered to the circuit through the inspiratory
limb.
Prior to using the FiO
2
monitor, a Learn Circuit needs to be performed to calibrate the sensor. Repeat the
calibration at regular intervals at least once every three months.
Note: It may take up to 30 minutes for the FiO
2
sensor readings to meet the specified accuracy after
powering on the device from off state or when all power source indicators are off.
The FiO
2
sensor performance can be adversely affected by relative humidity, condensation on the sensor
or unknown gas mixtures.
WARNING
Do not position the Astral device on its side as this may affect FiO
2
monitoring accuracy.
Attaching a nebuliser
If required, a nebuliser can be used in conjunction with the Astral device. ResMed recommends
Aerogen
®
nebuliser products—designed to operate in-line with standard ventilator circuits and
mechanical ventilators without changing ventilator parameters or interrupting ventilation.
WARNING
Always connect bacterial/viral filters to both the inspiratory port and the expiratory inlet of the
Astral device to protect the device.
• Regularly check the bacterial/viral filter and expiratory valve for signs of moisture or other
contaminants, particularly during nebulisation or humidification. Failure to do so could result
in increased breathing system resistance and/or inaccuracies in expired gas measurement.
• Only operate the nebuliser when the device is ventilating. If ventilation is stopped, switch off
the nebuliser.
• Use of a gas jet nebuliser may affect ventilator accuracy. Monitor the patient and compensate
for the gas volume introduced by the gas jet nebuliser as appropriate.
• For full details on using a nebuliser, see the User Guide that comes with that device.
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