M&C CG Series Instruction Manual page 14

Sulfur dioxide (SO
In the operating temperature range of the catalyst type SS of >600 °C [1112 °F]
N O T E !
existing concentrations of sulfur dioxide are partially destroyed (oxydised).
This fact can lead to faulty measurements in a downstream SO
The exact loss of concentration depends proportional on the oxygen concen-
tration of the sample gas and can be up to 25 % from the basic value.
Therefore, a SO
verter with catalyst type SS but with a separate sample gas way.
Ammonia (NH
In the operating temperature range of the catalyst type SS of >600 °C [1112 °F]
existing concentrations of ammonia are almost completely transformed into
N O T E !
NO if –as required for type SS- enough oxygen is in the sample gas. In the
operating temperature range of the catalyst type C around 350 °C [662 °F],
Ammonia in concentrations >100 ppm can alloy the NO
Nitrous Oxide (N
There was no influence of this gas detected on the NO
lyst type C or SS.
N O T E !
14
)
2
-measurement should not be installed downstream the con-
2
)
3
O)
2
CG-2 | 1.04.00
-measurement.
2
-No conversion.
2
conversion with cata-
2
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