Metrohm 850 Professional IC Anion MCS Prep 3 - Manual (Page 110)

4.13 Metrohm Suppressor Module (MSM)
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
100 ￭￭￭￭￭￭￭￭
850 Professional IC –Anion – MCS – Prep 3
4.13 Metrohm Suppressor Module (MSM)
4.13.1 Protection
To protect the MSM against foreign particles or bacterial growth, a pump
tubing connection with filter must be mounted between the peristaltic
pump (see Chapter 2.15, page 46) and the input capillaries of the MSM
(see Figure 31, page 48).
4.13.2 Operation
Note
The suppressor units must never be regenerated in the same flow direc-
tion in which the eluent is pumped. Therefore always mount the input
and output capillaries according to diagram outlined in Figure 36, Page
57.
The MSM consists of 3 suppressor units, which are used for suppression,
regenerated with sulfuric acid or rinsed with ultra pure water in rotation.
In order to record every new chromatogram under comparable condi-
tions, you should normally work with a freshly regenerated suppressor.
Caution
The MSM must never be switched over in a dry state, as there is a risk
of jamming. If the MSM is in a dry state, the MSM must be rinsed for at
least 5 minutes before it may be switched over.
Caution
In the case of reduced capacity or high backpressure, the MSM must be
regenerated (see Chapter 4.13.3.1, page 100), cleaned (see Chapter
4.13.3.2, page 102) or replaced (see Chapter 4.13.3.3, page 104).
4.13.3 Maintenance
4.13.3.1 Regenerating the MSM
If the suppressor units are loaded for a longer period with certain heavy
metals (e.g. iron) or organic impurities, these can no longer be completely
removed with the regeneration solution (50 mmol/L H
2
SO
4
) normally used.
The capacity of the suppressor units is consequently affected, which can
result in reduced phosphate sensitivity in less serious cases and a signifi-