TESTO 340 Instruction Manual page 56

56
Mass fl ow:
Mass fl ow CO:
Mass fl ow NO :
x
Mass fl ow SO :
2
Calculation term Z:
Conversion from ppm to mg/scm:
The numerical factor used in the formula (e.g. 1.25 for CO) corresponds to the stan-
dard density of the respective gas in mg/m³. Please note:
- for SO2, standard density values in the range from 2.86 to 2.93 are stated in lite-
rature (difference between ideal and real gas behaviour for SO2)
- for NOx the standard density of NO2 (2.05), is used, as only this compound is sta-
ble (NO combines very quickly after its creation with oxygen to form NO2)
Carbon monoxide:
Nitrogen oxide:
Sulfur dioxide:
MCO = CO [kg/h] [ppm] x F
Gas
MNO = NO [kg/h] [ppm] x F
x x Gas
MSO = SO [kg/h] [ppm] x F
2 2 Gas
273.15 x Pabs [mbar]
Z =
273.15 +T [°C] x 1013
O - O
2base 2Bez
CO [mg/scm] =
O - O
2base 2
O - O
2base 2Bez
NOx [mg/scm] =
O - O
2base
O - O
2base 2Bez
SO2 [mg/scm] =
O - O
2base 2
Testo-Direct
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x 1.25 [kg/m 3 ] x Z
x 2.05 [kg/m 3 ] x Z
x 2.86 [kg/m ] x Z Fgas:
3
T:
Z:
x V [m /s] x 10 -6
3 [1/ppm] x 3600
x CO [ppm] x 1.25
x NO [ppm] x 2.05
x
2
x SO [ppm] x 2.86
2
O
2base
O :
2
O :
2Bez
Fuel-specifi c
humidity value
Dew point
Calculation term
(see below)
: O Reference value
2
Measured oxygen
content as %
Fuel-specifi c
oxygen reference index as %
1.800.561.818
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