Metrohm 761 SD Compact IC - Manual (Page 110)

6 Notes – Maintenance – Faults
761 SD Compact IC / Instructions for Use 8. 761.1043
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6.2.8 Replacing the suppressor
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 major rise in baseline)
• Irremediable blockage of the suppressor
(Solutions can no longer be pumped through the sup-
pressor)
Both the suppressor rotor 6.2832.000 and the connector 6.2832.010
with the inlet and outlet capillaries can be replaced. Proceed as follows
in order to replace these components (see Figure 18):
1 Disconnect the suppressor from the IC system
• Disconnect all inlet and outlet capillaries of the suppressor
from the IC system and peristaltic pump.
2 Dismantle the suppressor
• Unscrew the nut 89 from the suppressor holder 92.
• Pull out the connector 90 and suppressor rotor 91 from the
suppressor holder 92 (the connector and the rotor normally
stick together).
• Detach the connector 90 from the suppressor rotor 91.
3 Clean the suppressor rotor
• Clean the sealing surface of the new suppressor rotors 91
(6.2832.000) using a lint-free cloth and ethanol.
4 Insert the suppressor rotor
• Insert the new suppressor rotor 91 in the suppressor holder
92 in such a way that the tubing connections at the rear of the
rotor fit in the corresponding openings inside the holder and
that one of the three holes in the rotor can be seen below in
the opening in the holder.
• If the rotor has been inserted correctly, its sealing surface will
be approx. 4 mm inside of the holder. If this is not the case,
move the rotor into the correct position from below with the
aid of a sharp object (e.g. screwdriver).
5 Clean the connector
• Clean the sealing surface of the new connector 90
(6.2832.010) with the aid of a lint-free cloth and ethanol.
6 Insert the connector
• Fit the new connector 90 onto the suppressor holder 92 in
such a way that connection "1" is at the top and that the three
lugs on the connector fit in the corresponding openings of the
holder.
• Screw the nut 89 onto the thread of the suppressor holder 92
by hand (do not use tools).