S/5 Airway modules
Document No. 800 1005-1
5
2
FUNCTIONAL DESCRIPTION
2.1
Measurement principle
2.1.1
CO
2
, N
2
O and Agent measurement
The CO
2
, N
2
O, and anesthetic agent gas measurements are based on absorption of infrared light as
it passes through the gas sample in measuring chamber in the photometer. The light absorption is
measured at three wavelengths using an infrared detector. One of the wavelengths is that of the
CO
2
absorption peak at 4.3 micrometers, the second is that of the N
2
O absorption peak at 3.9
micrometers, and the third is that of the anesthetic agent absorption peak at 3.3 micrometers. The
signal processing electronics receive the signals from the IR detector and demodulate it to get DC
components out of these signals which correspond to the content of each gas in the sample.
Figure 1
CO
2
/N
2
O/AA gas absorption spectra
Summary of Contents for S/5 B-GAS
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