Comen C80 - Measuring Principle and Working Process; Operating Instruction for CO Connection

115
Do not use this instrument where combustible anesthetic gases are present in the
environment.
Attention
This instrument can be operated only by professionals who are occupationally trained
and familiar with this manual.
In the “Monitor Settings” main menu, select “Module Switch Settings”, set the CO
2
switch to On,
as shown in the figure below:
Figure 16-1 CO
2
Waveform and Parameter Display
16.2 Measuring Principle and Working Process
The CO
2
measuring principle is mainly based on the characteristic that CO
2
can absorb the
infrared rays having a wavelength of 4. 3um. The measuring method works as follows: Gaseous
CO
2
is introduced to a measuring chamber of which one side is irradiated by infrared rays, and
sensors are employed to measure the attenuation degrees of received infrared rays at the other side
of the measuring chamber, and the attenuation degree is directly proportional to the CO
2
concentrations.
The comparison expression for the conversion between CO
2
partial pressure and CO
2
concentration is:
CO
2
Partial Pressure (mmHg)= CO
2
Concentration (%)¡ÁPamp (Ambient Pressure)
For example: 5% CO
2
= 38mmHg at 760mmHg
5% CO
2
= 35mmHg at 700mmHg
CO
2
Module: adopting Autorun instruction measurement mode, and the waveform is sampled
once in every 31 milliseconds.
16.3 Operating Instruction for CO
2
Connection