O
2
Sensor Calibration Maintenance
7 - 6 046-003777-00 A5/A3™ Operating Instructions
7.6 O
2
Sensor Calibration
Perform O
2
calibration when the measured value of O
2
concentration has a large deviation from
other reference sources or when the O
2
sensor is replaced. If the O
2
sensor is replaced, 100 % O
2
sensor calibration is required.
For continued O
2
sensor accuracy, the A5/A3 checks for 21 % O
2
calibration approximately every 72
hours. The A5/A3 prompts the user for 21 % O
2
calibration as follows:
• When the machine is powered on, if more than 72 hours have elapsed since the last
successful calibration, the prompt message "Calibrate O
2
sensor for 21 %" is displayed. The
message disappears after successful calibration.
• If the machine is kept powered on, the prompt message “Calibrate O
2
sensor for 21 %” is
displayed at the next Standby mode after 5 AM after 72 hours have elapsed since the last
successful calibration.
NOTE: If the alarm message "RT Clock Needs Battery" or "RT Clock Failure" is
displayed, the prompt message "Calibrate O
2
sensor for 21 %” is
disabled.
The O
2
sensor must be removed from the breathing system before calibrating it at 21 %. The O
2
sensor can be reinstalled after verifying that there is no water build-up in the O
2
sensor and its
installation part.
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