18 - 2
18.3 Measuring Mainstream CO
2
• When measuring CO2 using the mainstream CO2 module on patients who are receiving or have
recently received anesthetics, connect the gas outlet to the anesthesia machine or ventilator. This
avoids exposing medical staff to anesthetics.
• Be sure to set the barometric pressure properly before using the mainstream CO
2
module. Improper
settings will result in erroneous CO
2
reading.
• Always position the sensor with the adapter in an upright position to avoid collection of fluids in the
windows of the adapter. Large concentrations of fluids at this point will obstruct gas analysis.
• To avoid dead space, place the sensor as close to the patient as possible.
18.3.1 Zeroing the Mainstream CO
2
Sensor
• When perform a zero calibration during the measurement, disconnect the sensor from the patient’s
airway first.
• Do not rely on the readings during CO
2
zeroing.
18.4 Changing CO
2
Settings
18.4.1 Setting the Gas Compensation
• Make sure to use the appropriate compensations. Inappropriate compensations may cause
inaccurate measurement values and result in misdiagnosis.
18.4.2 Changing Barometric Pressure
• Be sure to set the barometric pressure properly before using the mainstream CO
2
module. Improper
settings will result in erroneous CO
2
reading.
18.5 CO
2
Calibration
• Connect the gas outlet to the scavenging system when calibrating the CO
2
module.
18.6 CO
2
Troubleshooting
• For the physiological and technical alarm messages, see DAlarm Messages.