Metrological certificate of approval
120
Cross sensitivities
No cross sensitivities against pollution gases with a range up to 100 ppm. For gases in a concentration range larger
than 1 Vol.-%: see table. The influence of the O
2
displacement is in not taken into account in the table (partial pressure
measurement).
Increased sensor drift can be caused by high sour gas concentrations (> 1 Vol.-%), which could make shorter calibra-
tion intervals necessary. The sensor service life is reduced in dependence on the duration and the concentration of the
sour gases (e.g. lifetime in atmospheres containing CO
2
: 5000 Vol.-% CO
2
x hours).
Organic solvents (e.g. acetone, propyl alcohol, etc.) dissolve in the plastic parts of the sensor. If allowed to react over
several days in larger concentrations (> 1 Vol.-%), these substances can cause sensor drift can which could make
shorter calibration intervals necessary. This will not reduce the sensor service life.
Gas / vapour Chemical symbol Gas concentration Measurement value deviation
in Vol.-% O
2
acetone CH
3
COCH
3
1 Vol.-% ≤ 0.1
ethane C
2
H
6
10 Vol.-% ≤ 0.1
ethanol C
2
H
5
OH 1 Vol.-% ≤ 0.1
ethylene C
2
H
4
5 Vol.-% ≤ 0.1
ethine C
2
H
2
2 Vol.-% ≤ 0.1
carbon dioxide CO
2
5 Vol.-% ≤ 0.1
carbon monoxide CO 1 Vol.-% ≤ 0.1
methane CH
4
10 Vol.-% ≤ 0.1
methanol CH
3
OH 1 Vol.-% ≤ 0.1
propane C
3
H
8
5 Vol.-% ≤ 0.1
hydrogen H
2
10 Vol.-% ≤ 0.1
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