CO
2
Monitoring
17-5
The calculation formulas in the above two units are as follows:
ATPD: PCO
2
(mmHg)= CO
2
(vol%)× Pamp/100
BTPS: PCO
2
(mmHg)= CO
2
(vol%)×(Pamp-47)/100
In the above formulas, PCO
2
refers to the CO
2
partial pressure, vol% is the
percentage of the gas concentration, and Pamp is the ambient pressure in the unit of
mmHg.
WARNING
z Do not use the accessory if the packaging or the internal accessory is
damaged. Return it to the manufacturer.
z “CO2 START UP” and “CO2 WARM UP” displayed on the screen indicate
that the sensor is starting up and warming up. During the warming up,
the module can measure CO
2
, but the measurement is not standard.
After the above information disappears, the standard measurement can
be performed.
z The sidestream sampling line is disposable. It should not be disinfected
for reuse or cross-used by different patients.
z The water trap is used to collect water drops condensed in the sampling
airway and prevent water drops from entering the module. When the
collected water reaches to a certain amount, remove the water to avoid
blocking the airway.
z In the long-term use, dust or other substances may lower the air
permeability of the filter material in the water trap and may block the
airway. In this situation, the water trap must be replaced.
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