ABB EasyLine EL3000, Operating Instruction

Page: 138 / 216

138
EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 9 Calibration
Fidas24 – Response factors and other relevant variables
Response factors
Definition
or
The response factor of Propane (C
3
H
8
) is equal to 1.00 in
accordance with the definition.
Response factors for Fidas24 analyzer module
sample component Response factor*
Toluol C
7
H
8
0.95
Chlorobenzene C
6
H
5
Cl 0.95
p-Xylol C
8
H
10
0.92
Benzol C
6
H
6
0.99
Ethylbenzene C
8
H
10
0.92
Propane C
3
H
8
1.00
n-Hexane C
6
H
14
0.97
n-Octane C
8
H
18
0.93
iso-Octane C
8
H
18
1.04
Trichloroethylene C
2
HCl
3
0.96
Tetrachloroethylene C
2
Cl
4
1.00
Ethane C
2
H
6
1.01
Butane C
4
H
10
0.97
Methanol CH
3
OH 0.74
Butanol C
4
H
9
OH 0.83
Acetic acid C
2
H
4
O
2
0.52
Dichloromethane CH
2
Cl
3
1.00
Methane CH
4
1.13
* Measurement of the components in synthetic air
Note
The response factors for an individual analyzer module may
differ slightly from the values indicated in the table.
Response factors for additional sample components
If a measuring component is added with a response factor which
was not factory-set, we recommend determining this as follows:
The following information should therefore be noted in
particular:
• The zero point should not differ essentially from the
calibrated zero point, in particular when measuring with
small concentrations. Otherwise the display must be
offset against the deviation from the calibration of the
zero point with the measured value display.
• The response factors of a gas in nitrogen and in synthetic
air may differ considerably from each other.
• The measurements should always be performed with a
sample component and a measuring range, for example
THC in ppm C1. When calculating the test gas
concentration, the number of C-atoms must be
considered.
• Test gas cylinders with high accuracy (1 % and better)
should be used.
Other relevant variables
The following variables must be stored in the software of the
gas analyzer for each measuring component:
Molar mass, number of C-atoms, response factor and strip
factor (K factor)
These variables are stored for the standard sample components;
they must be entered when adding a user component.
Molar mass
M
C
= 12.011 g/mol
M
H
= 1.008 g/mol
Molar volumes
V
m
= 22.414 l/mol for 0 °C and 1013 hPa
V
m
= 24.05 l/mol for 20 °C and 1013 hPa