Metrohm 732 IC Detector - Manual (Page 40)

2.8 Separating columns and suppressor module
732 IC Detector / 733 IC Separation Center
33
2.8.3 General information on suppressor module
The Metrohm Suppressor Module MSM for chemical suppression
installed in the 2.733.0X30 IC Separation Center 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 chroma-
togram 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 2.8.6 according
to the scheme shown in Fig. 18.
For operation of the suppressor module, a two-channel peristaltic
pump is needed 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. We advise working with a flow rate of 0.5 mL/min.
The 752 Pump Unit is available from Metrohm as an option. Two
lengths of pump tubing (6.1826.050) are enclosed with this pump
(flow rate 0.5 mL/min). Startup and operation of the 752 Pump Unit is
described in the Instructions for Use enclosed with the pump.
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 2.8.6 (see Fig. 16 and Fig. 17).
To avoid contamination of the suppressor module by foreign particles
or bacterial growth, it is advantageous to install an in-line filter be-
tween the 752 Pump Unit and the suppressor module. The two
6.2821.100 Filter units PEEK (see section 2.6.3) supplied with the
2.733.0X30 IC Separation Center are eminently suitable for this pur-
pose.
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.