15-2
15.2 Mindray DS CO
2
Module
NOTE
z This section is only applicable to a monitor equipped with a Mindray DS CO2
module.
15.2.1 Principles of Operation
WARNING
z The CO2 module should be protected against crash and vibration.
z This CO2 module is applicable to neonate, pediatric as well as adult patients.
z Inaccurate measurement may occur when the monitor is operating in an
environment of excessively high CO2 content (>0.5%).
The monitor adopts sidestream CO
2
module. The measurement of this module is based on the
feature that the CO
2
molecule absorbs infrared ray. The measurement procedure is as follows :
send the CO
2
to a measurement chamber inside the module through the airway system, and then
irradiate 4.26um infrared ray at one side of the chamber and use the sensor to measure the
attenuation degree of the received infrared ray at the other side. Since the attenuation degree of
the infrared ray is proportional to the concentration of CO
2
, the CO
2
concentration is calculated.
The measured CO
2
concentration is thereafter converted into the partial pressure under the same
temperature and pressure, and then displayed.
The relation between the partial pressure and the CO
2
concentration is given below:
CO
2
partial pressure (mmHg)=
CO
2
concentration (%)×Pamp (ambient pressure, mmHg)/100
CO
2
partial pressure (kPa)= CO
2
partial pressure (mmHg)/7.5
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