6.11 Metrohm Suppressor Module (MSM)
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930 Compact IC Flex Oven/SeS/PP (2.930.2500)
6.11.3.3 Regenerating the cation suppression rotor
If the cation suppressor units are exposed to certain contaminations for
prolonged periods, then these contaminations can no longer be removed
completely with the standard regeneration solution. The performance of
the suppressor units declines continuously, as indicated by a rise of the
baseline or asymmetrical peaks.
If such problems occur at one or more positions, then treat all of the cat-
ion suppressor units as follows:
Regenerating the cation suppressor
1
Stopping the regeneration solution
Stop the regeneration solution feed.
2
Regenerating the first cation suppressor unit
Rinse the system with eluent until the suppressor unit is completely
exhausted (indicated by a significant increase in conductivity). This
can take up to 240 minutes under standard conditions.
3
Regenerating the second cation suppressor unit
In the software, use the Step command to switch to the next sup-
pressor unit. Repeat step 2.
4
Regenerating the third cation suppressor unit
In the software, use the Step command to switch to the next sup-
pressor unit. Repeat step 2.
5
Restoring the regeneration solution
As soon as all three suppressor units are completely exhausted,
restore the regeneration solution feed.
6
Equilibrating the system
Equilibrate the system as usual (see chapter "Conditioning" in the
manual for the ion chromatograph).
6.11.3.4 Cleaning the Metrohm Suppressor Module
(MSM)
In the following cases, it may be necessary to clean the Metrohm Suppres-
sor Module (MSM):
￭ Increased backpressure at the MSM's connection tubing.
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