Metrohm 930 Compact IC Flex Oven/SeS/Deg - Manual (Page 93)

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5 Operation and maintenance
930 Compact IC Flex Oven/SeS/Deg (2.930.2460)
￭￭￭￭￭￭￭￭ 85
5.13 Servicing the Metrohm CO
2
Suppressor (MCS)
5.13.1 Replacing the CO
2
adsorption cartridge
Maintenance interval The CO
2
adsorption cartridge (6.2837.000) loses capacity over time. In
addition, it can become slightly clogged due to too much liquid. It has to
be replaced regularly about every 6 months.
Capacity loss
The adsorption capacity of the CO
2
adsorption cartridge is limited and
decreases over time. This is indicated by an increasing baseline (since more
CO
2
gets to the detector). The CO
2
adsorption cartridge has to be
replaced once the adsorption capacity is depleted. CO
2
adsorption car-
tridges are available under order number 6.2837.000.
Blockage
If the CO
2
adsorption cartridge is blocked by moisture, this is indicated by
a color change in the cartridge material (the orange part becomes color-
less). Since a blocked cartridge allows less air through, the vacuum in the
degassing cell is also weaker and the CO
2
has a more difficult time diffus-
ing out of the eluent.
To protect the CO
2
adsorption cartridge from becoming blocked and to
increase its service life, we recommend installing and regularly regenerat-
ing an additional H
2
O adsorption cartridge.
5.13.2 Regenerating the H
2
O adsorption cartridge
The H
2
O adsorption cartridge protects the CO
2
adsorption cartridge from
moisture; in other words, it adsorbs moisture from the surrounding air.
The lifetime of the H
2
O adsorption cartridge depends on the moisture
content of the surrounding air. The color of the adsorber material changes
once the capacity of the H
2
O adsorption cartridge starts decreasing (e.g.
from orange to colorless for Sigma-Aldrich Art. No. 94098). The H
2
O
adsorption cartridge has to be regenerated (see leaflet) before the color of
all of the adsorber material has changed.
Regenerating the H
2
O adsorption cartridge
Also see the information in the leaflet for the H
2
O adsorption cartridge.
1 Replacing the adsorber material
￭ Remove the depleted absorber material from the cartridge.
￭ Fill the cartridge with fresh adsorber material. Cover it with cot-
ton.