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Emerson Process Management GmbH & Co. OHG3-6
X-STREAM X2
Instruction Manual
HASX2E-IM-HS
02/2012
3.2 Oxygen Measurement
Cross Interferences By Accompanying Gases
The Table below by selected gases shows,
how accompanying gases interfere the pa-
ramagnetic oxygen measurement. A more
comprehensive list of gases and their cross
interferences for example is given in the stan-
dard IEC 61207-3.
If the concentration of such gases is already
given at time of enquiry, this interference may
be taken into account during factory startup
and thus minimized (option)
Tab. 3-1: Paramagnetic sensor -
cross interferences (examples)
100 % Gas Zero-level effect % O
2
Acetylene C
2
H
2
-0.29
Ammonia NH
3
-0.20
Argon Ar -0.25
Bromine Br
2
-2.02
1.2-Butadiene C
4
H
6
-0.49
1.3-Butadiene C
4
H
6
-0.49
n-Butane C
4
H
10
-1.26
i-Butene C
4
H
8
-1.30
cis 2-Butene C
4
H
8
-0.89
trans 2-Butene C
4
H
8
-0.92
Carbon dioxide CO
2
-0.30
Carbon monoxide CO +0.07
Chlorine Cl
2
-0.94
Cyclohexane C
6
H
12
-1.84
Ethane C
2
H
6
-0.49
Ethylene C
2
H
4
-0.22
Helium He +0.33
n-Heptane C
7
H
16
-2.40
n-Hexane C
6
H
14
-2.02
Hydrogen H
2
+0.26
Hydrogen bromide HBr -0.76
100 % Gas Zero-level effect % O
2
Hydrogen chloride HCl -0.35
Hydrogen ouride HF +0.10
Hydrogen iodide HI -1.19
Hydrogen sulphide H
2
S -0.44
Iodine I -2.40
Isobutane C
4
H
10
-1.30
Krypton Kr -0.55
Laughing gas N
2
O -0.23
Methane CH
4
-0.18
Neon Ne +0.17
Nitric acid HNO
3
+0.43
Nitrogen N
2
±0.00
Nitrogen dioxide NO
2
+20.00
Nitrous oxide NO +42.94
n-Octane C
8
H
18
-2.78
n-Pentane C
5
H
12
-1.68
Oxygen O
2
100
Propane C
3
H
8
-0.87
Propylene C
3
H
6
-0.64
Vinyl chloride C
2
H
3
Cl -0.77
Water H
2
O -0.03
Xenon Xe -1.05
Note!
This data is based on a temperature of 60 °C (140 °F).