Wohler Econometer E 98 Bedienungsanleitung Seite 42

8. Calculation formulas
The air ratio number (Lam) will be calculated in accordance with equation 10.3:
The undiluted carbon monoxide concentration (Co
and 0 value measured.
2
The dew point (DP) will be computed via a formula that takes into account the
stochiometric composition of the fuel, an assumed relative air moisture as well as a
mean air pressure. The acid dew point which may be higher - depending on the sulfur
content - will not be taken into account.
Meaning:
A = fuel-specific factor
2
B = fuel-specific factor
CO = measured CO value
CO = carbon dioxide volume content in dry waste gas
2
CO = maximum carbon dioxide content in dry waste gas
2 max.
for each fuel in volume percent
O = oxygen volume content in dry waste gas
2
T = exhaust gas temperature
A
T = combustion air temperature
L
Lam = excess air rate
Manual Instruction
21.0
Lam
=
21.0 - O
2
) will be calculated with the CO
norm
21.0
CO = CO
norm
21.0 - O
42
q
(10.3)
(10.4)
2