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ENGLISH
Chapter 2 - Technical specifications and characteristics
EtCO2
Method:
Creative proprietary non-dispersive InfraRed Spectroscopy
Range:
0 – 150mmHg or 0 – 20kPa or 0 – 20% (v/v)
Accuracy:
±2mmHg for EtCO2 range 0 - 40mmHg ±5% for EtCO2 range
from 41 - 70mmHg ±8% for EtCO2 range from 71 - 100mmHg
Over 100mmHg ±10%
Note 1: The accuracy of CO2 concentration measurement is influenced by any
interfering gas and/or vapour, for example N2O gas can raise the CO2 reading (2-
10%), and Helium and O2 can reduce the CO2 reading (1-10%), so compensation
should be set in the balance gas MENU to meet the accuracy requirements if such
gases or vapours are present.
Note 2: The accuracy of CO2 concentration measurement is also influenced by
Respiration rate. The corresponding relationship is as follows:
Table1 EtCO2/ Respiration Rate Accuracy
EtCO2
(
mmHg)
Respiration Rate
(bpm)
Accuracy
0 - 40
0-79
± 2 mmHg
>80
±12%
41 - 70
0-79
±5%
>80
±12%
71 - 100
0-79
±8%
>80
±12%
>100
0-79
±10%
>80
±12%
Test method:
As shown in table 1, test the accuracy of different concentrations of gas at different
respiratory rates. Set up the gas flow rate of 1 L/min, the sampling rate is 100ml/
min. And then record the data.
The device in real time measures CO2 in the breathing loop, when inhaling, CO2
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