ABB AO2000 Series User Manual

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
CHppm93.306
12.011 1
22.414 50
Matoms C of Number
VMR
[ppm]c
4
=
×
×
=
×
×
=
m
HCCH
3
CH
V
)Matoms H of NumberMatoms C of (Number[ppm]c
][mg/mc
4
4
×+××
=
()
3
4
3
CH
/mCH mg 66.785
22.414
1.008 4 12.011 1 93.306
][mg/mc
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
CHppm 82.572
1.13
93.306
Rf
[ppm]c
[ppm]c
4
4
4
===
3
4
CH
3
CH
3
maxCH
/mCHmg 59.102
1.13
66.785
Rf
][mg/mc
][mg/mc
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
CCylinder
3
CH
V
Matoms C of Numberc
]C/m[mgc
4
××
=
33
CH
C/m mg 43.513
22.414
12.011 1 81.2
]C/m[mgc
4
=
××
=
Considering the response factor, the indication should be adjusted to
3
CHCHmaxCH
C/m mg 49.1697 1.13 43.513RfcC/m³] [mgc
444
=×=×=
.

ABB AO2000 Series Specifications

General

Brand	ABB
Model	AO2000 Series
Category	Measuring Instruments
Language	English