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Commissioning
9.5 Zero point error
Accompanying gas (concentration 100 vol. %)
Water
Hydrogen
Since the zero point deviations are linear, it is easy to convert to lower interfering gas
concentrations.
In the case of interfering gases with a constant concentration, an interfering gas correction
with constant zero point offset can be carried out in the gas to be measured. If the
concentration of the accompanying gases changes during the oxygen measurement, a
variable interfering gas correction has to be carried out. An external concentration must
be determined for each interfering gas with a considerable zero point deviation. Its result is
fed as interfering gas concentration into the OXYMAT 7 analyzer module and the correction
value is calculated constantly.
Information on interference gas correction is available in the following operating manuals:
• Operating with the Local User Interface Table A-2 References 1 - Operating Manuals LUI
(Page 179)
• Operation with SIMATIC PDM Table A-3 References 2 - Operating Manuals PDM (Page 179)
See also
References (Page 179)
9.5.2
CALOMAT 7
Overview
To determine the cross-interferences of accompanying gases with several interference gas
components, you must know the sample gas composition. The following table contains the zero
offsets for the carrier gas N
Table 9-6
132
as H
equivalent values with 10% interference gas
2
2
Zero offset in the system H
Interference gas
CH
4
C
H
2
6
C
H
3
8
CO
CO
2
O
2
N
O
2
NH
3
Ar
He
SF
6
H
O
2
H
2
in N
2
2
H
equivalent values with 10% inference gas
2
Operating Instructions, 07/2023, A5E31930403-AB
Zero point deviation in
vol. % O
absolute
2
-0.03
+0.26
1.77%
0.47%
-0.28%
-0.10%
-0.84%
0.19%
-0.83%
1.45%
-1.22%
6.32%
-2.15%
Wall-mounted device
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