ABB ACF5000 - FID: Conversion of concentration data; Various units for concentration details; Examples for the conversion of units and concentration details

74 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
FID: Conversion of concentration data
Various units for concentration details
When measuring organic carbon compounds (total C) the concentration is
indicated in various units. The most important units are:
 mg C/m
3
(e.g. for measurements in accordance with 17. German Federal
Regulation on Emissions)
 mg C
n
H
m
/m
3
 ppm C
n
H
m
(e.g. or measurements in accordance with Federal German
Regulations on Air Purity, details on test gas cylinders)
 ppm C1 (for TOC [total organic carbons] or methane CH
4
)
Examples for the conversion of units and concentration details
Conversion ppm to mg C
n
H
m
/m
3
m
3
mn
V
weightMolecular
ppm /mHC mg 
Conversion ppm to mg C/m
3
m
3
V
12.011 atoms C of Number
ppmm/C mg


Conversion ppm to ppm C1
atoms C of Number ppm C1 ppm 
Example 1
The analyzer module has a measuring range of 0 to 50 mg C/m
3
. As a test
gas, propane (C
3
H
8
) in N
2
or in air is used.
What is the maximum test gas concentration in ppm or mg/m
3
for the
measuring range not to be exceeded?
83
C
m
HC
HCppm31.102
12.011 3
22.414 50
Matoms C of Number
VMR
]ppm[c
83







m
HCHC
3
HC
V
)Matoms HNumber Matoms C(Number[ppm]c
][mg/mc
83
83



3
83
3
HC
/mHC mg 61.19
22.414
1.008 8 12.011 3 31.102
][mg/mc
83


