M&C TechGroup CG-2H-W_-2MH-W Operator's manual - Manual (Page 11)

11
Gas sampling and conditioning technology 9-0.2-ME
Figure 3 Notch to differentiate the two cartridge types
N O T E !
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).
N O T E !
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.
N O T E !
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.
N O T E !
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!
D A N G E R !
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 !
D A N G E R !
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