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Measuring
Carrier
Basic
Smallest
Smallest suppressed
Multi Gas
Gas
Gas
range
range
zero range
Mode
H
2
N
2
or air
0% - 100%
0% - 0.5%
98% - 100%
Yes
H
2
Ar
0% - 100%
0% - 0.4%
99% - 100%
Yes
H
2
He
20% - 100%
20% - 40%
85% - 100%
On request
H
2
CH
4
0% - 100%
0% - 0.5%
98% - 100%
On request
H
2
CO
2
0% - 100%
0% - 0.5%
98% - 100%
On request
He
N
2
or air
0% - 100%
0% - 0.8%
97% - 100%
Yes
He
Ar
0% - 100%
0% - 0.5%
98% - 100%
Yes
CO
2
N
2
or air
0% - 100%
0% - 3%
96% - 100%
Yes
CO
2
Ar
0% - 60%
0% - 10%
-
Yes
Ar
N
2
or air
0% - 100%
0% - 3%
96% - 100%
Yes
Ar
CO
2
40% - 100%
-
80% - 100%
Yes
CH
4
N
2
or air
0% - 100%
0% - 2%
96% - 100%
Yes
CH
4
Ar
0% - 100%
0% - 1.5%
97% - 100%
Yes
O
2
N
2
0% - 100%
0% - 15%
85% - 100%
Yes
O
2
Ar
0% - 100%
0% - 2%
97% - 100%
Yes
N
2
Ar
0% - 100%
0% - 3%
97% - 100%
Yes
N
2
CO
2
0% - 100%
0% - 4%
96% - 100%
On request
NH
3
H
2
0% - 100%
0% - 5%
95% - 100%
On request
CO
H
2
0% - 100%
0% - 2%
99% - 100%
On request
SF
6
N
2
or air
0% - 100%
0% - 2%
96% - 100%
On request
Table 2.1: List of available gas mixtures. Other gases and ranges on request.
the concentration of the gas concerned. The selective measurement of up to three infrared-active
gases in one mixture is enabled by a detector, which tests the absorption with three interference
fi lters at three different wavelengths. The selection of the interference fi lters thus determines
which gases are analyzed. A fourth measurement channel is in a wavelength range where no
absorption of any of the gases occur. Thus the intensity of the IR radiator is determined and
serves as a reference. The combination of the IR measurement with the thermal conductivity
measurement enables the complete determination of complex gas mixtures in many cases.
File name: Manual_FTC400_1.09KD181129CWI1V01.pdf