Metrohm 820 IC Separation Center - Manual (Page 81)

4.2 Maintenance and servicing
819 IC Detector / 820 IC Separation Center
73
3 Connect suppressor to IC system
• Reconnect suppressor to the IC system. If capacity problems
persist, replace the suppressor rotor (see Section 4.2.8).
4.2.7 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. 29):
1 Disconnect suppressor from IC system
• Disconnect input lead of suppressor from the separating col-
umn and output lead to the detector.
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 input and output leads
• Connect each of the 6 capillary tubings attached to connec-
tion piece 73 to the pump one after another, and pump
through ultrapure water.
• Check whether solution emerges from connection piece 73.
If one of the input or output leads remains blocked, replace
the connection piece 73 (order number 6.2832.010).
4 Clean suppressor rotor
• Clean the sealing surface of suppressor rotor 74 using a lint-
free cloth and ethanol.
5 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).