Monitoring Carbon Dioxide
13-10
13.7 Zeroing the Sensor
The zero calibration eliminates the effect of baseline drift during CO
2
measurement exerted
on the readings and therefore maintains the accuracy of the CO
2
measurements.
13.7.1 For Sidestream and Microstream CO
2
Modules
For sidestream and microstream CO
2
modules, a zero calibration is carried out automatically
when necessary. You can also start a manual zero calibration if necessary. To manually start a
zero calibration, select [Start Zero Cal.] in the [CO2 Setup] menu. Disconnecting the
patient airway is not required when performing a zero calibration.
13.7.2 For Mainstream CO
2
Modules
For mainstream CO
2
modules, zero the sensor whenever:
îš„ A new adapter is used;
îš„ You reconnect the sensor to the module;
îš„ You see the message [CO2 Zero Required]. In this case, check the airway adapter for
any blockage, e.g. mucus, etc. If a blockage is detected, clear or replace the adapter.
To zero the sensor, follow this procedure:
1. Connect the sensor to the module.
2. In the [CO2 Setup] menu, set the [Operating Mode] to [Measure]. The message [CO2
Sensor Warmup] is displayed.
3. After warm-up is finished, connect the sensor to a clean, dry airway adapter. The adapter
should be vent to the air and isolated from CO
2
sources, such as ventilator, the patient’s
breathing, your own breathing, etc.
4. Select [Start Zero Cal.] in the [CO2 Setup] menu. The message [CO2 Zero Running]
is displayed.
5. It takes about 15 to 20 seconds. The message disappears when the zero calibration is
completed.
WARNING
z When perform a zero calibration during the measurement, disconnect the
transducer from the patient’s airway first.
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