Vital Signs Monitor User’s Manual
Chapter 8-1
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.
The method to measure carbon dioxide in the patient’s airway for this monitor is
microstream. That is takeing a sample of the respiratory gas with a constant sample
flow from the patient’s airway and analyzes it with the CO2 sensor.
1. Attaching the CO
2
Module Cable
Plug the cable into the CO
2
connector on the monitor.
2. Attaching the Sampling Tube
Insert the sampling tube into the sampling tube receptacle. Shown as follows:
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