Simtronics GD1 MK3, Operating Manual

Page: 37 / 76

GD1 Page 37 of 76 850-816926-EN R06
# Step description Illustration / response
1
Clean the lenses on the TX and RX as described in
section 5.2.
2
Fill the Test Cell with CO
2
as described in the
section 4.2, but with CO
2
instead of H
2
S.
Recommended CO
2
test gas concentration is 10
000 – 100 000 ppm (1 %vol - 10 %vol).
3
Position the Test Cell in front of the receiver (RX)
as indicated in the figure.
4
Verify the response in the GD1 spectrum.
The output should change according to the length
of the Test Cell
multiplied with the gas
concentration. Below is an example with 40000
ppm CO
2
filled into the Test Cell by breath.
Expected output value (ppm CO
2
):
𝑪
𝒄𝒆𝒍𝒍
∗ 𝟎. 𝟓𝟒 + 𝑪
𝒂𝒊𝒓
∗ 𝑷𝒂𝒕𝒉_𝒍𝒆𝒏𝒈𝒕𝒉
𝑷𝒂𝒕𝒉_𝒍𝒆𝒏𝒈𝒕𝒉
Where C
cell
and C
air
is the CO
2
concentration in respectively the
Test Cell and air.