M&C CG-2 - Check of the Efficiency; Conversion Ppm -> Mg;M

24 CG-2 | 1.04.00 www.mc-techgroup.com
17.1 CHECK OF THE EFFICIENCY
To check the efficiency of the converter cartridge a test gas with a NO
2
-concentration according to the
concentration in the sample gas (e.g. 20 ppm in N
2
) is necessary.
Feed test gas upstream the converter and read measured NO-concentration at the analyzer.
Measured NO-concentration [ppm]
Efficiency = ------------------------------------------------- x 100 %
NO
2
-concentration in test gas [ppm]
For a precise result the measuring range of the analyser has to be adapted to the concentration of the
test gas!
17.2 CONVERSION PPM --> MG/M
3
1 ppm --> mg/m
3
DIN 1343
NTP
STP
SATP
T=0 °C
T=20 °C
T=25 °C
T=25 °C
p=1013 mbar
p=1013
p=1000
p=1013
Nitrogen monoxide NO
1.34 mg/m
3
1.25
1.21
1.23
Nitrogen dioxide NO
2
2.05 mg/m
3
1.91
1.86
1.88
Standard conditions
DIN 1343 Standard conditions in Germany
NTP Normal temperature and Pressure mainly in the USA
STP Normal conditions weltweit standardized
SATP new Normal conditions “Standard Ambient Temperature and Pressure“
The table is based on the following calculation. This calculation is based on the ideal gas laws
Molecular weight NO = 30.01
Molecular weight NO
2
= 46.0055
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