Metrohm 861 Advanced Compact IC - Manual (Page 44)

2 Installation
861 Advanced Compact IC / Instructions for Use 8.861.1033
34
3 Connect column to suppressor module «MSM II»
• Screw the outlet end of separating column 73 to the "Sup-
pressor inlet capillary for eluent" 82, which is permanently at-
tached to the suppressor module «MSM II» 46.
4 Fix column
• Insert one or two column holders 74 (6.2027.030, 6.2027.040
or 6.2027.050) in the mounting rails 25 and fasten separating
column 73 in the column holder 74.
2.8 Suppressor module «MSM II»
2.8.1 General information on suppressor module «MSM II»
The suppressor module «MSM II» for chemical suppression installed
in the 2.861.0020 and 2.861.0040 Compact 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 chromato-
gram under comparable conditions, work is normally carried out with
freshly regenerated 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 Figure 18.
For operation of the suppressor module «MSM II» the two-channel
peristaltic pump built into the versions 2.861.0020 and 2.861.0040 is
used which conveys the regeneration solution (normally 20 mmol/L
H
2
SO
4
) and the rinsing solution (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
«MSM II» each have 2 permanently mounted PTFE capillaries, which
must be connected as described in Section 2.8.4 (see Figure 16 and
Figure 18).
In order to protect the suppressor module «MSM II» from foreign bodies
or bacterial growth a 6.2821.130 Filter 58 (forms part of "PEEK coupling
81 with filter and tubing security device" 6.2744.180) must be mounted
between the peristaltic pump and the inlet capillary of suppressor mod-
ule «MSM II».
The suppressor module «MSM II» must never be switched in the dry
state as there is a danger of blocking. Before every switching opera-
tion of the suppressor module «MSM II», the three suppressor units
must have been rinsed for at least ½ h with eluent, regeneration and
rinsing solution.