15-9
15.7 Troubleshooting the Sidestream CO
2
Sampling System
When the sampling system of the sidestream CO
2
module works incorrectly, check if the sampling line is kinked. If not,
remove it from the watertrap. If the monitor gives a message indicating the airway still works incorrectly, it indicates that
the watertrap must have been blocked, and you should replace with a new one. Otherwise, you can determine that the
sampling line must have been blocked. Replace with a new sampling line.
15.8 Removing Exhaust Gases from the System
WARNING
When using the Sidestream or Microstream CO
2
measurement on patients who are receiving or have
recently received anesthetics, connect the outlet to a scavenging system to avoid exposing medical staff to
anesthetics.
To remove the sample gas to a scavenging system, connect an exhaust tube to the gas outlet connector of the module.
15.9 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.
15.9.1 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, from the [User Maintenance] menu,
select [Module Maintenance >>]→ [Maintain CO2 >>]→ [Calibrate CO2 >>]→[Start Zero Cal.]. Disconnecting the
patient airway is not required when performing a zero calibration.
15.9.2 For Mainstream CO
2
Modules
For mainstream CO
2
modules, zero the sensor whenever:
A new adapter is used;
You reconnect the sensor to the module;
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 vented to the
air and isolated from CO
2
sources, such as ventilator, the patient’s breathing, your own breathing, etc.
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