Patient Monitor User’s Manual
5-1
Chapter 5 Measuring CO2
5.1 Introduction
The monitor adopts infrared absorption technology to measure
the carbon dioxide (CO
2
) concentration in the breathing airway of
patient. Because CO
2
molecule can absorb infrared light of special
wavelength, and the amount of absorbed infrared light directly
relates to the concentration of CO
2,
therefore while the infrared
light radiated from the infrared light source passing through the
gas sample containing CO
2
, part of energy will be absorbed by
CO
2
in the gas. At another side of infrared light source, a
photodetector is used to measure the remaining infrared energy
and convert it to electric signal, which will be compared with the
energy of infrared light source and adjusted so as to correctly
reflect the CO
2
concentration in the gas sample.
Sidestream: Takes a sample of the respiratory gas with a
constant sample flow from the patient’s airway and analyzes it
with the CO
2
sensor.
5.2 Safety Information
Warning:
Do not position the sensor cables or tubing in any
0
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