Operator's manual

11
Gas sampling and conditioning technology 9-0.2-ME
Figure 3 Notch to differentiate the two cartridge types
NOTE!
For catalyst type SS, oxygen in the sample gas as well as in the test gas (>1
Vol.% O
2
) is necessary. A calibration with NO
2
or N
2
is not possible.
8.2 SELECTION OF THE APPROPRIATE CATALYST TEMPERATURE
The converter with carbon-molybdenum cartridge filling is pre-adjusted to 350°C in the factory. In case
of a metallic cartridge filling, the converter temperature is adjusted to 660°C. The catalyst temperature
can be adjusted continuously using the temperature controller on the front of the converter (see 17.2).
NOTE!
Depending on the gas composition and the flow temperature can be
adjusted and optimised within a certain level:
320°C – 380°C, type C respectively
620°C – 680°C type SS.
NOTE!
High NO
2
-concentrations, especially in connection with high flow ra-
tios need higher operating temperatutres of the converter, in particu-
lar the start up process of the maximum values.
NOTE!
High operating temperatures of the converter, especially the start up
process of the maximum values leads to an increased abrasion of
converter components, in particular sealing- and oven-components!
DANGER!
The maximum allowable operating temperature for catalyst type C is
380°C. Temperatures above 400°C lead to a combustion of the conver-
ter material. Urgent fire danger !
DANGER!
The maximum allowable operating temperature for catalyst type SS is
680°C. Temperatures above 680°C can lead to a destruction of the
catalyst resp. converter!
Type SS