Metrohm 820 IC Separation Center - Manual (Page 83)

4.2 Maintenance and servicing
819 IC Detector / 820 IC Separation Center
75
4.2.8 Replacement of suppressor module
The suppressor in the suppressor block may have to be replaced in the
following cases:
• Irremediable loss of suppressor capacity (reduced
phosphate sensitivity and/or strong rise in baseline)
• Irremediable blockage of the suppressor (the suppres-
sor can no longer deliver solutions)
Both the 6.2832.000 Suppressor rotor and the 6.2832.010 Connection
piece with the input and output leads can be replaced. To replace these
components proceed as follows (see Fig. 29):
1 Disconnect suppressor from IC system
• Disconnect all input and output leads of the suppressor from
IC system and the 833 IC Liquid Handling Pump Unit.
2 Dismantle suppressor
• Unscrew nut 72 from suppressor holder 75.
• Pull out connection piece 73 and suppressor rotor 74 from
suppressor holder 75 (the connection piece and the rotor
normally stick together).
• Loosen connection piece 73 from suppressor rotor 74.
3 Clean suppressor rotor
• Clean the sealing surface of new suppressor rotor 74
(6.2832.000) using a lint-free cloth and ethanol.
4 Insert suppressor rotor
• Insert suppressor rotor 74 in suppressor holder 75 in such a
way that the tubing connections at the rear of the rotor fit in
the corresponding openings inside the rotor, and that one of
the three holes in the rotor can be seen from below in one of
the openings of the holder.
• If the rotor has been inserted correctly, its sealing surface will
be about 4 mm inside the holder. If this is not the case, bring
the rotor into the correct position from below with the aid of a
sharp object (e.g. a screwdriver).
5 Clean connection piece
• Clean the sealing surface of connection piece 73 using a lint-
free cloth and ethanol.