TESTO 340 Instruction Manual page 55

Poison index:
Excess Air (ExAir):
Nitrogen oxides:
Carbon monoxide
undiluted:
Flue gas dew point:
Flow speed:
Air fl ow:
CO
ratio =
CO x 10000
2
( )
21%
= -1 x 100
21% - O
2
No NO2 sensor connected:
NO = NO + (NO x NO)
x 2Add.
NO2 sensor connected:
NO = NO + NO
x 2
uCO = CO x 
F x P
H20 Abs
( )
ln 610.78
( )
P =
ln
F x P
H20 Abs
610.78
575 x P x (FT + 273.15)
v =
P
abs
V = v x a
Testo-Direct
www.
CO:
CO :
2
21%:
O :
2
NO:
NO
2Add.
CO:
:
x 234.175
F :
H20
- 17.08085
P :
Abs
x 
P :
abs
 P:
FT:
:
v:
a:
Measured carbon monoxide
value in %
Calculated carbon dioxide
value
Oxygen level of air
Measured oxygen level in %
Measured nitrogen
monoxide value
: Nitrogen dioxide
addition factor
measured carbon
monoxide content
Calculated air ratio
Flue gas-specifi c
water vapour content as
vol.%
Absolute pressure in
mbar/hPa
Absolute pressure
Differential pressure
Flue gas temperature
Pitot tube factor
Flow speed
Cross-section area
1.800.561.818
.ca
55