Zero Point Error - Siemens SIPROCESS GA700 Operating Instructions Manual

Commissioning
9.2 OXYMAT 7
9.2.3

Zero point error

Accompanying gases (interfering gases) cause a zero point deviation that is positive with
paramagnetic gases and negative with diamagnetic gases. The extent of this offset per 100
vol. % accompanying gas, expressed in vol. % O
Since the zero point deviations are linear, it is easy to convert to lower interfering gas
concentrations.
If the concentration of the accompanying gases changes during the oxygen measurement, a
variable interfering gas correction has to be carried out. To this purpose, an external
determination of concentration is required for each interfering gas that exert a significant
zero point deviation. The result of this deviation has to be fed into the analyzer module
OXYMAT 7 as an interfering gas concentration. For further information on this, refer to the
SIPROCESS GA700 operating manual.
Accompanying gas (concentration 100 vol. %)
Organic gases
Ethane
Ethene (ethylene)
Ethine (acetylene)
1.2 butadiene
1.3 butadiene
n-butane
Isobutane
1-butene
Isobutene
Dichlorodifluoromethane (R12)
Ethanoic acid
n-heptane
n-hexane
Cyclo-hexane
Methane
Methanol
n-octane
n-pentane
Isopentane
Propane
Propylene
Trichlorofluoromethane (R11)
Vinyl chloride
Vinyl fluoride
1.1 vinylidene chloride
54
, is listed in the following table.
2
Zero point deviation in vol. % O
absolute
C H
2 6
C H
2 4
C H
2 2
C H
4 6
C H
4 6
C H
4 10
C H
4 10
C H
4 8
C H
4 8
CCl F
2 2
CH COOH
3
C H
7 16
C H
6 14
C H
6 12
CH
4
CH OH
3
C H
8 18
C H
5 12
C H
5 12
C H
3 8
C H
3 6
CCl F
3
C H Cl
2 3
C H F
2 3
C H Cl
2 2 2
Operating Instructions, 01/2013, A5E31930403-01
2
-0.49
-0.22
-0.29
-0.65
-0.49
-1.26
-1.30
-0.96
-1.06
-1.32
-0.64
-2.40
-2.02
-1.84
-0.18
-0.31
-2.78
-1.68
-1.49
-0.87
-0.64
-1.63
-0.77
-0.55
-1.22
Wall-mounted device