Dräger Polytron 7000 Instructions For Use Manual page 120

Metrological certificate of approval
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
measurement).
Gas / vapour
acetone
ethane
ethanol
ethylene
ethine
carbon dioxide
carbon monoxide
methane
methanol
propane
hydrogen
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
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.
120
displacement is in not taken into account in the table (partial pressure
2
Chemical symbol
CH COCH
3 3
C H
2 6
C H OH
2 5
C H
2 4
C H
2 2
CO
2
CO
CH
4
CH OH
3
C H
3 8
H
2
: 5000 Vol.-% CO
2
Gas concentration Measurement value deviation
1 Vol.-%
10 Vol.-%
1 Vol.-%
5 Vol.-%
2 Vol.-%
5 Vol.-%
1 Vol.-%
10 Vol.-%
1 Vol.-%
5 Vol.-%
10 Vol.-%
x hours).
2
in Vol.-% O
2
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1
≤ 0.1