Metrohm 872 Extension Module Suppression – MCS - Manual (Page 49)

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5 Operation and maintenance
872 Extension Module Suppression – MCS
￭￭￭￭￭￭￭￭ 41
5.5 Metrohm CO
2
Suppressor (MCS)
5.5.1 Replacing the CO
2
adsorption cartridge
The 6.2837.000 CO
2
adsorption cartridge (11-4) must be replaced regu-
larly. This is because of blockages and losses in capacity.
Jamming
Moisture can block the CO
2
adsorption cartridge. This is revealed by a
change in color of the cartridge material (the orange part becomes color-
less). As the air flow is reduced, the vacuum becomes lower. To protect
the CO
2
adsorption cartridge, an H
2
O adsorption cartridge (11-7) is instal-
led upstream. Regular regeneration (see Chapter 5.5.2, page 41) of the
H
2
O adsorption cartridge extends the service life of the CO
2
adsorption
cartridge.
Capacity loss
The adsorption capacity of the CO
2
adsorption cartridge is limited.
Depending on the period of operation and laboratory environment, the
adsorption capacity will diminish over time. This is manifested in a rising
baseline (as more CO
2
reaches the detector).
5.5.2 Regenerating the H
2
O adsorption cartridge
The function of the H
2
O adsorption cartridge is to protect the CO
2
adsorp-
tion cartridge against moisture. The service life of the H
2
O adsorption car-
tridge depends on the moisture content of the ambient air. Moisture
reduces the capacity of the H
2
O adsorption cartridge (which can be
observed by a change in color). Before the color changes in the entire fill-
ing material (from orange to colorless, with Fluka Order No. 94098), the
H
2
O adsorption cartridge should be regenerated (see leaflet). The filling
material is replaced during regeneration:
1 Allow material to dry loose (not in cartridge) at 140 °C overnight and
refill. Or dispose of the old material, and fill with new material.
2 Cover the packed material with cotton.