88
13 Appendix
13.5 Wet/Dry Measurement Deviations, Conversion Table
NOTICE
The LT3-F carries out measurements directly in the humid flue gases (wet measurement).
When extractive devices are used, flue gases are removed and prepared. "Dry measure-
ments" are normally used here, since the humidity has been extracted from the flue gas. As a
result, O
2
measurement values vary (see diagrams below).
Fig. 13-1 Theoretical max. deviations of the O
2
concentration in wet and dry measurement.
Fuel: natural gas or oil
Fig. 13-2 Calibration plot for the concentration values of O
2
(dry) and O
2
(wet)
O
2
concentration range Constant C gas/Ch
4
Constant C oil/(CH
2
)
x
0-6 % O
2
1,18 1,115
6-12 % O
2
1,08 1,08
0-12 % O
2
1,15 1,10
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