7.3 Calibrate oxygen sensor
(only valve ventilation)
7.3.1 General
If oxygen is supplied during therapy, oxygen concentration is measured at the device outlet
port so as to ensure that the patient is always adequately supplied with oxygen.
To ensure the accuracy of the measurement, calibration should be performed daily.
Calibration is necessary in the case of
– unsettled weather (air pressure, temperature) or
– changes in therapy pressure.
Always perform calibration with the device warmed up (approx. 20 minutes after switching on).
Perform calibration of the oxygen sensor once a day to avoid the weather affecting
measuring results. The device will issue the relevant message each day to remind you to
perform calibration. This message also appears if:
– the device has previously been disconnected from the power supply
– 24 hours have passed since the last calibration
– the oxygen sensor has been disconnected electrically from the device and then
reconnected.
Note
The sensor is calibrated at a proportion of 21 % oxygen (ambient air). Turn off the
oxygen supply on the oxygen source (flow meter or oxygen concentrator) for this.
7.3.2 Precautions
Take the following precautions when calibrating.
1. Shut off the oxygen source.
2. Operate the device for approx. two minutes without an oxygen supply to flush out the
remaining oxygen in the device.
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