Metrohm 793 IC Sample Preparation Module - Manual (Page 27)

3.1 Handling the SP Module A
793 IC Sample Prep Module/ 8.793.1003 Instructions for Use
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3 Operation
3.1 Handling the SP Module A
General
The SP Module A of the 793 Sample Prep Module consists of a total
of three cation exchange units which are in turn used for cation ex-
change, regenerated and rinsed with water. In order to record each new
chromatogram under comparable conditions a freshly regenerated
cation exchange unit is normally used. Switching is either carried out
automatically together with valve switching or manually.
Correct connections
The three inlets and outlets numbered 1...3 on the SP Module A each
have 2 permanently mounted PTFE capillaries, which must be con-
nected as described in sections 2.3.2 or 2.4.2 respectively (see Fig. 6).
Flow direction
The cation exchange units must never be regenerated in the same
flow direction used for the sample. You should thus always install the
inlet and outlet capillaries as described in sections 2.3.2 or 2.4.2
respectively according to the scheme shown in Fig. 6.
Never switch when dry
The SP Module A must never be switched in the dry state as there is
a danger of blocking.
No recycling
The recycling process (returning the eluent to the storage vessel)
must not be carried out when the SP Module A is in operation.