7-6
7.5 Troubleshooting
When the sampling system of the CO2 module works incorrectly, check if the sampling line
is kinked. If not, remove the sampling line from the water trap. Then, if a prompt message
indicating airway malfunction appears on the screen, it means that the water trap is occluded.
In this case, you must replace the water trap. If no such prompt message is displayed, it
means that the sampling line is occluded. Then you must replace the sampling line.
7.6 Zero the Sensor
Zeroing the sensor aims to eliminate the effect of baseline drift on the readings during the
measurement so as to ensure measurement accuracy.
For CO2 module, a zero calibration is carried out automatically when necessary. You can also
start a manual zero calibration when deemed necessary. To manually start a zero calibration,
push the Menu key. Select [System] → [CO2] → [Zero]. You do not need to disconnect
the sensor from the breathing system when performing the zeroing.
7.7 Calibrate the Sensor
For CO2 module, a calibration should be performed once a year or when the measured value
has a great deviation. For details, refer to 11 Maintenance.
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