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18.5.2 Preparing to Measure CO
2
Using Microstream CO
2
Module
To prepare the CO
2
module for measurement, follow this procedure:
1. Connect one end of the sample line to the microstream CO
2
module.
2. Connect the other end of the sample line to the patient.
◆ For intubated patient requiring an airway adapter, install the airway adapter between the patient
circuit and the ventilator Y-piece.
◆ For non-intubated patient, place the nasal cannula onto the patient.
◆ For patient prone to mouth breathing, place the oral-nasal cannula onto the patient.
3. Connect the gas outlet to the a scavenging system using an exhaust tube.
After the CO
2
module is connected, it enters measure mode by default and the monitor displays CO2 Sensor
Warmup. CO
2
can be measured after the start-up is complete.
• Connect the gas outlet to the scavenging system when measuring CO
2
using the microstream CO
2
module.
• Disconnect the sample line from the module when CO
2
monitoring is not required.
18.5.3 Zeroing the Sidestream/Microstream CO
2
Module
The sidestream and microstream CO
2
modules perform a zero calibration automatically when needed. Once the
zero calibration is started, the CO
2
module stops measuring and “Zeroing” is displayed in the CO
2
numeric area.
After the zero calibration is completed, the CO
2
module reacquires the CO
2
readings. During the reacquisition
period, “Zero Recovering” is displayed in the CO
2
numeric area. Valid data will reappear 30 seconds after the
zero calibration is started. You can hide the display of the “Zero Recovering” message, but values displayed
during the reacquisition period may not be accurate.
The automatic zero calibration will not start under the following conditions:
■ Physiological alarms related to CO
2
or AG are active.
■ An apnea alarm is active.
■ No breath has been detected for over 30 seconds.
You can also perform the zero calibration manually.
(1) Sample line connector (2) Sample line
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