User guide

5 Notes – Maintenance – Faults
732 IC Detector / 733 IC Separation Center
138
5.2.5 Changing separating columns
Identical separation system
If you wish to replace an IC separating column by a column of the same
type, proceed as follows (see Fig. 16 and Fig. 17):
1 Remove old column
• Switch off pump drive of the 709 IC Pump.
• Unscrew column from inlet capillary 8282 of the detector block
or from suppressor inlet capillary 8989.
• Unscrew column from column connection capillary 6767 or the
precolumn.
2 Connect new column to injector
• Remove end caps from column 7676.
• Screw inlet end of separating column 7676 (note flow direction)
to column connection capillary 6767 or to the precolumn (see
section 2.8.4/section 2.8.6).
3 Rinse column
• Place beaker beneath the column outlet.
• Switch on 709 IC Pump and rinse column with eluent for ca.
10 min, then switch off pump.
4 Connect column to detector block
• Screw outlet end of separating column 7676 to inlet capillary 8282
or suppressor inlet capillary 8989.
Changing the separation system
If you wish to replace an IC separating column by a column of a differ-
ent type, proceed as follows (see Fig. 16 and Fig. 17):
1 Remove old column
• Switch off pump drive of 709 IC Pump.
• Unscrew column from inlet capillary 8282 of the detector block
or from the suppressor inlet capillary 8989.
• Unscrew column from column connection capillary 6767 or the
precolumn.
2 Connect detector block to injection valve
• Connect column connection capillary 6767 using a 6.2620.060
Coupling directly to inlet capillary 8282 of the detector block
(see Fig. 16).
3 Rinse with HNO
3
(passivation)
• Rinse IC system with c(HNO
3
) = 0.2 mol/L (flow rate
1 mL/min) for ca. 10 min.