Metrohm 861 Advanced Compact IC - Manual (Page 86)

4 Notes - Maintenance - Faults
861 Advanced Compact IC / Instructions for Use 8.861.1033
76
Figure 21: Components of inlet valve 99 and outlet valve 100
4.2.7 Regeneration of the suppressor module «MSM II»
Regenerating a suppressor operating at reduced
capacity
If the suppressor units are exposed to certain heavy metals (e.g. iron)
or organic contaminants for long periods of time, these can no longer
be completely removed by the regeneration solution normally used (50
mmol/L H
2
SO
4
). This diminishes the capacity of the suppressor units,
which, in milder cases, results in a reduced sensitivity to phosphates
and, in severe cases, in a strong increase in the baseline. If such ca-
pacity problems occur at one or several positions, the suppressor units
must be treated as follows:
1 Disconnect suppressor from IC system
• Disconnect suppressor from separating column and detector.
2 Regenerate suppressor
• Rinse each suppressor unit for about 15 min with one of the
following solutions:
Contamination with heavy metals
1 mol/L H
2
SO
4
/ 0.1 mol/L oxalic acid
Contamination with organic cationic complexing agents
104 Valve housing
105 Sealing ring (black)
106 Sleeve
107 Sapphire sleeve
The bright side must point towards the
sapphire sphere.
108 Sapphire sphere
109 Ceramic holder for sapphire
sphere
The large recess must point in the di-
rection of the sapphire sphere
110 Seal
The larger opening must point out-
wards
104
105
106
107
108
109
110
104
105
106
109
108
107
110
99
Inlet valve
100
Outlet valve