Bacharach FYRITE Gas Analyzer CO2 and O2 Indicators - 5.4 CO₂ FYRITE Only Combustion Testing; 5.4.1 Percent CO₂ Shows Volume of Excess Air; 5.4.2 Too Much Excess Air Means Inefficient Combustion

Instruction 0011-9026Page 12
0-7.6% CO
2
or O
2
CO
2
tests of controlled atmospheres in fruit,
vegetable, and meat storage rooms. Oxygen
determination in fl ammable gases. Oxygen tests
to check atmospheres made inert with nitrogen
(silos, fuel tanks, etc.)
0-20% CO
2
or 0-21% O
2
Flue gas combustion tests, oxygen defi ciency tests,
and CO
2
tests of heat treating atmospheres.
Checking oxygen concentrations in hydrogen-cooled
generators and oil-sealed inert-gas transformers.
0-60% CO
2
or O
2
Checking CO
2
in inert gas blankets in tankers and
barges carrying gasoline and other com bustibles.
CO
2
tests on lime kilns. Checking CO
2
in sewage
plant digesters. Oxygen tests in connection with
oxygen and gas anesthesiology.
5.4 CO
2
FYRITE Only Combustion Testing
5.4.1 Percent CO
2
Shows Volume of Excess Air (Refer to Figure 15)
For any given fuel, theoretical maximum percent CO
2
(Ultimate CO
2
) would be pro-
duced when exactly enough air (but no excess air whatsoever) is supplied to burn all
of the fuel. As increasing amounts of excess air are supplied, percentage CO
2
naturally
decreases from theoretical Ultimate CO
2
due to the diluting effect of excess air.
Thus, measuring percent CO
2
is also a method of indicating excess air to ensure that
enough is supplied to permit clean combustion without adding so much that combus-
tion effi ciency is unnecessarily decreased.
5.4.2 Too Much Excess Air Means Ineffi cient Combustion