Metrohm 861 Advanced Compact IC - Manual (Page 90)

4 Notes - Maintenance - Faults
861 Advanced Compact IC / Instructions for Use 8.861.1033
80
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).
Rotors which are not inserted correctly can be destroyed
when starting operation.
5 Clean connection piece
• Clean the sealing surface of new connection piece 112
(6.2832.010) with the aid of a lint-free cloth and ethanol.
6 Insert connection piece
• Insert new connection piece 112 in suppressor holder 114 in
such a way that connection "1" is at the top and that the three
lugs on the connection piece fit in the corresponding open-
ings of the holder.
• Screw nut 111 onto the thread of suppressor holder 114
manually (do not use tools).
7 Connect and condition the suppressor
• Reconnect the suppressor to the IC system.
• Before switching the suppressor to the next position for the
first time, rinse all 3 suppressor units with solution for 5 min.
4.2.10 Replacing the pump tubing
The pump tubings used by the peristaltic pump are consumable mate-
rial with a limited lifetime and should be exchanged at regular intervals
(approx. every 4 weeks under continuous use).
The working life of pump tubing depends to a considerable extent on
the contact pressure. This is why the contact pressure must be cor-
rectly set as described in Section 2.10.2. If the pump is to remain
switched off for a lengthy period of time the tubing cartridges 47 should
be raised completely by loosening the snap-action lever 50 on the right-
hand side (the set contact pressure remains unchanged).
As the pump is always operated on the same side the 6.1826.110
Pump tubings supplied can be used on both sides. To exchange a
pump tubing proceed as follows:
1 Remove old pump tubing
• Press contact pressure lever 48 on the tubing cartridge 47
down as far as it will go.
• Release tubing cartridge 47 from holding clamp 49 by press-
ing down snap-action lever 50 and remove from mounting pin
52 (see Figure 16).
• Remove old pump tubing 78 or 79.
2 Insert new pump tubing