Metrohm 861 Advanced Compact IC - Manual (Page 87)

4.2 Maintenance and servicing
861 Advanced Compact IC / Instructions for Use 8.861.1033
77
0.1 mol/L H
2
SO
4
/ 0.1 mol/L oxalic acid / acetone 5%
Severe contamination with organic substances
0.2 mol/L H
2
SO
4
/ acetone ≥ 20%
The 6.1826.110 Pump tubing is made of PVC and must
not be used for rinsing with solutions which contain or-
ganic solvents. In such cases, rinse with different pump
tubing or a different pump.
3 Connect suppressor to IC system
• Reconnect suppressor to the IC system. If capacity problems
persist, replace the suppressor rotor (see Section 4.2.9).
4.2.8 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 suppressor can no
longer deliver solutions)
• Irremediable obstruction of the suppressor (the suppressor can
no longer be switched to next position)
To clean the connection piece and the rotor, proceed as follows (see
Figure 22):
1 Disconnect suppressor from IC system
• Disconnect input capillary 82 of the suppressor module «MSM
II» 46 from the separating column 73 (see Figure 16).
• Disconnect output capillary 83 from inlet capillary 44.
• Disconnect inlet capillaries 84 and 85 from the PEEK Cou-
pling 81 (supply from peristaltic pump).
2 Dismantle suppressor
• Unscrew nut 111 from suppressor holder 114.
• Pull out connection piece 112 and suppressor rotor 113 from
suppressor holder 114 (the connection piece and the rotor
normally stick together). If this is not the case, take a sharp
object, insert it in slot 115 of the suppressor holder and use it
to pull out suppressor rotor 113).
• Loosen connection piece 112 from suppressor rotor 113.
3 Clean input and output leads
• Connect each of the 6 capillary tubings attached to connec-
tion piece 112 to the high-pressure pump one after another,
and pump through ultrapure water.
• Check whether solution emerges from connection piece 112.
If one of the input or output leads remains blocked, replace