8-16
8.5.3 Measurement Limitations
Measurement accuracy may degrade due to:
Leakage or internal leakage of the sample gas.
Mechanical shock
Cyclic pressure which is greater than 10 kPa (100 cmH2O)
Other interference source (if available)
8.5.4 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 mainstream CO2 module, zero the sensor when:
1. The adapter is replaced.
2. The sensor is re-connected to the module.
3. The message [CO2 Zero Required] is displayed. In this case, check the airway adapter
for blockage. If a blockage is detected, clear or replace the adapter.
To zero the sensor, do as follows:
1. Connect the sensor to the CO2 module.
2. Access the [Gas Module Setup >>] menu and set [Working Mode] to [Measure]. The
message [CO2 Warmup] is displayed.
3. After warm-up is finished, connect the sensor to a clean, dry airway adapter. The adapter
should be vented to the air and isolated from CO2 sources, including ventilator, the
patient’s breathing and your own breathing.
4. Select [Zero] from the [Gas Module Setup >>] menu and the screen displays [CO2
Zero Running].
5. A typical zeroing takes about 15 to 20 seconds. This message disappears after zeroing is
completed.
WARNING
z When zeroing the sensor during the measurement, disconnect the sensor from the
breathing system first.
8.5.5 Calibrate the Sensor
For the mainstream CO
2
module, calibration is not required. Contact us if calibration is
necessary.
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