8 suppressor module, 1 general information on suppressor module, 2 preparation of the peristaltic pump – Metrohm 792 Basic IC User Manual
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2.8 Suppressor module
792 Basic IC
35
2.8 Suppressor
module
2.8.1
General information on suppressor module
The
Metrohm Suppressor Module MSM for chemical suppression in-
stalled in the 2.792.0020 Basic IC comprises a total of 3 suppressor
units which are in turn used for suppression, regenerated with sulfuric
acid and rinsed with water. To record every new chromatogram under
comparable conditions, work is normally carried out with freshly regen-
erated suppressor. Switching is either automatic together with the valve
switching or manual.
The suppressor units must never be regenerated with H
2
SO
4
in the
same flow direction used for the eluent. You should thus always install
the inlet and outlet capillaries as described in section 2.8.4 according
to the scheme shown in Fig. 15.
For operation of the suppressor module, the
two-channel peristaltic
pump built into the 2.792.0020 Basic IC is used which conveys the re-
generation solution (normally
20 mmol/L H
2
SO
4
) and the rinsing solu-
tion (normally
dist. H
2
O) to the suppressor units (flow rate of
0.5 mL/min).
The three inlets and outlets numbered 1...3 on the suppressor module
each have 2 permanently mounted PTFE capillaries, which must be
connected as described in section 2.8.4 (see Fig. 14 and Fig. 15).
To avoid contamination of the suppressor module by foreign particles
or bacterial growth, the two
6.2821.100 Filter units PEEK (see sec-
tion 2.3.5) supplied with the 2.792.0020 Basic IC must be installed be-
tween the peristaltic pump and the inlet capillaries of the suppressor
module.
The suppressor module must never be switched in the dry state as
there is a danger of blocking. Before every switching operation of the
suppressor module, the three suppressor units must have been
rinsed for at least ½ h with eluent, regeneration and rinsing solution.
2.8.2
Preparation of the peristaltic pump
Before start-up the accessories for the 2-channel peristaltic pump built
into the 792 Basic IC must be mounted according to Fig. 13. Proceed
as follows:
1 Attach pump tubings
x Loosen both tubing cartridges 40
40
40
40 mounted above pump drive
44
44
44
44 from the holding clamp 42
42
42
42 by pressing down snap-action
lever 43
43
43
43 and remove from mounting pin 45
45
45
45 (see Fig. 14).