IMR® 2800
44
IMR Environmental Equipment, Inc.
4.4 CONVERTING PPM INTO VOLUME/WEIGHT RATIO
The conversion of ppm values into mg/m3 (milligram per cubic meter) is based on the
following conversion factors (referred to 0
C / 32
F gas temperature):
CO
1 ppm = 1.25 mg/m3
SO2
1 ppm = 2.86 mg/m3
NO
1 ppm = 1.34 mg/m3
NO2
1 ppm = 2.05 mg/m3
If the selection "NO(x) as vol. NO2" is activated, then the conversion for NO or NO(x) is:
NO(x)
1 ppm = 2.05 mg/m3
4.5 CONVERTING PPM INTO VOLUME/WEIGHT RATIO WITH REF. O2
EB = (20.9 - O2B) / (20.9 - O2M) * EM
EB:
Emission with reference to the oxygen content
EM:
Measured emission in mg/m3
O2M: Measured oxygen content (%)
O2B: Content of reference oxygen (%)
Fuel oil
Natural
Gas
Town
gas
Coal gas Liquid gas
Coke
Wood
air-dry
O2B
3%
3%
3%
3%
3%
7%
11%
4.6 NOx (NO+NO2)
If the analyzer has a NO and a NO2 sensor, then the NOx value is calculated as following:
NOx = NO + NO2
NOx in ppm
NO:
measured NO value in ppm
NO2: measured NO2 value in ppm
