15-7
15.8 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.
15.9 Removing Exhaust Gases from the System
WARNING
Anesthetics: 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, or to the anesthesia
machine/ventilator, 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.
15.10 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.
15.10.1 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:
1. Select [Main Menu]→[Maintenance >>]→[User Maintenance >>]→enter the required password→[Maintain
CO2 >>].
2. Select [Calibrate CO2 >>]→[Start Zero Cal.].
Disconnecting the patient airway is not required when performing a zero calibration.
15.11 Calibrating the Sensor
For sidestream or microstream CO
2
modules, a calibration should be performed once every year or when the readings go
far beyond the range. For details, refer to the chapter 23 Maintenance.
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