| © 2020 ResMed. 24/03/20 - COVID-19 - This document is based on information available at the time of publication
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• The oxygen sensor is a standard inclusion on the Astral 150 (hospital) and an optional accessory on
the Astral 150 and 100 for homecare. 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
• The oxygen sensor performance can be adversely affected by relative humidity, condensation on the
sensor or unknown gas mixtures
Monitoring the delivered FiO
2
with oxygen sensor
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