Metrohm 940 Professional IC Vario ONE/SeS/PP/Prep 3 - Manual (Page 54)

3.15 Metrohm CO
2
Suppressor (MCS)
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940 Professional IC Vario ONE/SeS/PP/Prep 3 (2.940.1530)
Figure 14 Peristaltic pump
1 Contact pressure lever 2 Tubing cartridges (6.2755.000)
3 Cartridge holder 4 Snap-action lever
5 Rollers 6 Roller hub
7 Mounting bolt
3.15 Metrohm CO
2
Suppressor (MCS)
3.15.1 General information on MCS
NOTE
The Metrohm CO
2
Suppressor (MCS) is used only in conjunction with
conductivity detection with chemical suppression.
The Metrohm CO
2
Suppressor (MCS) removes the CO
2
from the eluent
stream. This lowers the background conductivity, improves detection sen-
sitivity and minimizes the injection peak and carbonate peak.
CO
2
can enter the eluent stream through the sample itself or can develop
due to the suppression reaction in the suppressor. Connecting the MCS
between the suppressor and detector minimizes the CO
2
peak in the chro-
matogram.
The MCS essentially consists of a degassing cell containing a capillary
made from a fluoropolymer membrane. The capillary is permeable to
gases. The degassing cell is connected to the vacuum pump. The eluent is
directed into the degassing cell through the capillary made of a fluoropol-