248
AO2000
CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Example 2
If a test gas other than propane is used, its response factor (see page 245)
must be taken into consideration.
What is the maximum test gas concentration in ppm or mg/m
3
if methane
(CH
4
) is used?
4
C
m
CH
CH
ppm
93.306
12.011
1
22.414
50
M
atoms
C
of
Number
V
MR
[ppm]
c
4
=
×
×
=
×
×
=
m
H
C
CH
3
CH
V
)
M
atoms
H
of
Number
M
atoms
C
of
(Number
[ppm]
c
]
[mg/m
c
4
4
×
+
×
×
=
(
)
3
4
3
CH
/m
CH
mg
66.785
22.414
1.008
4
12.011
1
93.306
]
[mg/m
c
4
=
×
+
×
×
=
The response factor for methane is Rf
CH4
= 1.13; i.e. the measured value dis-
play is too great by this factor. In order to determine the maximum test gas
concentration to avoid exceeding the measuring range, the measured value
display must be divided by the response factor.
4
CH
CH
maxCH
CH
ppm
82.572
1.13
93.306
Rf
[ppm]
c
[ppm]
c
4
4
4
=
=
=
3
4
CH
3
CH
3
maxCH
/m
CH
mg
59.102
1.13
66.785
Rf
]
[mg/m
c
]
[mg/m
c
4
4
4
=
=
=
A test gas cylinder with approx. 80 ppm CH
4
is ordered. The test gas con-
centration in the test gas cylinder is 81.2 ppm CH
4
according to the certifi-
cate.
This is equivalent to a concentration of
m
C
Cylinder
3
CH
V
M
atoms
C
of
Number
c
]
C/m
[mg
c
4
×
×
=
3
3
CH
C/m
mg
43.513
22.414
12.011
1
81.2
]
C/m
[mg
c
4
=
×
×
=
Considering the response factor, the indication should be adjusted to
3
CH
CH
maxCH
C/m
mg
49.1697
1.13
43.513
Rf
c
C/m³]
[mg
c
4
4
4
=
×
=
×
=
.
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