CO
2
Monitoring
17-4
17.2.2 Preparations for CO
2
Measurement
1. Plug the water trap into its receptacle before the measurement.
2. Open the CO2 SETUP menu and set WORK MODE to MEASURE. The “CO2
START UP” prompt information is displayed on the screen until the startup is
finished.
3. After the module start-up, the “CO2 WARM UP” prompt information is
displayed on the screen. At this time, the module is in the Warming–up status.
4. After the module warm-up, the module enters the Ready-to-measure status.
When the monitor is powered on for the first time, the CO
2
module enters the
STANDBY mode by default. To activate the CO
2
module, you must change the work
mode to MEASURE. The work mode of the CO
2
module keeps unchanged when the
monitor is restarted. For instance, if the monitor is power off when the CO
2
module
is working in the MEASURE mode, the CO
2
module will automatically enter the
MEASURE mode after the monitor is restarted. For details about WORK MODE,
please refer to the section Other Setup in 17.2.3 CO2 .
Figure 17-2 CO
2
Module Airway Connections
The measure CO
2
concentration can be displayed in two units:
ATPD (Ambient Temperature and Pressure, Dry Gas);
BTPS (Body temperature and pressure, Saturated);
ATPD means the CO
2
value is measured in ambient temperature and pressure and
dry gas, while BTPS means the CO
2
is measured at a temperature of 37℃, a relative
humidity of 95% and a 47mmHg (pH2O) partial pressure of moisture.
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