User guide

5.2 Maintenance and servicing
732 IC Detector / 733 IC Separation Center
141
2 Regenerate suppressor
• Connect the inlet capillary 90 90 marked "H
2
SO
4
" to the 709 IC
Pump using the 6.2620.060 or 6.2744.040 coupling.
• Set the flow at the 709 IC Pump to 0.5 mL/min and rinse the
suppressor unit with 1 mol/L H
2
SO
4
for 5 to 10 min.
• As the pressure falls, slowly increase the flow at the 709 IC
Pump to 2 mL/min. Do not exceed a maximum pressure of
2 MPa (20 bar).
• Switch suppressor to the next position using the <STEP>
key.
• Connect the inlet capillary 9393 marked "H
2
O" to the 709 IC
Pump using coupling 6.2620.060 or 6.2744.040.
• Set the flow at the 709 IC Pump to 0.5 mL/min and rinse the
suppressor unit with distilled H
2
O for 5 to 10 min.
• As the pressure falls, slowly increase the flow at the 709 IC
Pump to 2 mL/min. Do not exceed a maximum pressure of
2 MPa (20 bar).
3 Connect suppressor to IC system
• Reconnect the suppressor to the IC system and the 752
Pump Unit. If the pressure problems persist, replace the sup-
pressor rotor (see section 5.2.8).
5.2.7 Cleaning the suppressor
It may be necessary to clean the suppressor in the following cases:
• High counterpressure on the suppressor connection
tubing
• Irremediable blockage of the suppressor (the suppres-
sor can no longer deliver solutions)
• Irremediable obstruction of the suppressor (the sup-
pressor can no longer be switched to next position)
To clean the connection piece and the rotor, proceed as follows (see
Fig. 24):
1 Disconnect suppressor from IC system
• Disconnect input lead of suppressor from the separating
column and output lead to the detector.
2 Dismantle suppressor
• Unscrew nut 9797 from suppressor holder 100100.
• Pull out connection piece 9898 and suppressor rotor 9999 from
suppressor holder 100100 (the connection piece and the rotor
normally stick together).
• Loosen connection piece 9898 from suppressor rotor 9999.