TESTO 325M - Technical Data (Continued); Calculation Formulae

33
10. Technical data
10.4 Calculation formulae
The formulae are specified for the instrument version .
Carbon dioxide: CO
2
= CO
2max
: Maximum carbon dioxide value
specific to fuel
21%: Oxygen level of air
O
2
: Measured oxygen level in %
Ratio: rat = CO: Measured carbon monoxide value in ppm
CO
2
: Calculated carbon dioxide value in %
Efficiency
referred to H
o
: EFF
GROS
= 100 - + +
Efficiency
referred to H
u
: EFF
NET
= 100 - + +
K
gr
/K
net
/Q
gr
/Q
net
/K1/MH
2
O/H: Fuel-specific factors
FT: Flue gas temperature
AT: Ambient temperature
CO: Measured carbon monoxide value in %
CO
2
: Calculated carbon dioxide value in %
Excess Air (EXA): E
A
= -1 x 100 21%: Oxygen level of air
O
2
: Measured oxygen level in %
Air ratio: = CO: Measured carbon monoxide value in %
CO
2
: Calculated carbon dioxide value in %
Carbon monoxide
undiluted: uCO = CO: Measured carbon monoxide value in %
21%: Oxygen level of air
O
2
: Measured oxygen level in %
Conversion of ppm in mg/m
3
, referred to O
2
reference value:
CO (mg/m3) = x CO (ppm) x 1.25 21%: Oxygen level of air
O
2
: Measured oxygen level in %
O
2ref
:O
2
reference value in %
(fuel-specific)
Dew point
of flue gas: F
H20
: Fuel-dependent water vapour
td = factor in vol.%
P
abs
: Absolute pressure in mbar/hPa
CO
2max
x (21% - O
2
)
21%
CO
CO
2
x 10000
CO
2max
CO
2
21% - O
2ref
21% - O
2
F
H20
x P
Abs
610.78
()
ln x 234.175
F
H20
x P
Abs
610.78
()
ln - 17.08085
21%
21% - O
2
()
21%
21% - O
2
()
K
gr
x (FT - AT)
CO
2
()(
(MH
2
O + 9 x H) x (2488 + 2.1 x FT - 4.2 x AT)
Q
gr
x 1000
()
K1 x CO
CO
2
+ CO
()
K
net
x (FT - AT)
CO
2
()(
(MH
2
O + 9 x H) x (210 + 2.1 x FT - 4.2 x AT)
Q
net
x 1000
()
K1 x Q
gr
x CO
Q
net
x (CO
2
+ CO)
()