Metrohm 761 SD Compact IC - Manual (Page 111)

6.2 Maintenance and servicing
761 SD Compact IC / Instructions for Use 8. 761.1043
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7 Connect and condition the suppressor
• Reconnect the suppressor to the IC system.
• Before switching the suppressor to the next position for first
time, rinse all three suppressors with solution for 5 minutes.
6.2.9 Replacing the pump tubing
The pump tubing 61 and 64 used in the peristaltic pump are consum-
able material 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 2.14. If the pump is to remain
switched off for a lengthy period of time, the tubing cartridges 57
should be raised completely by loosening the snap-action lever 59 on
the right-hand side (once set, the contact pressure remains un-
changed).
As the pump is always operated on the same side, the supplied pump
tubing 6.1826.110 can be used on both sides. Proceed as follows in
order to exchange pump tubing:
1 Remove the old pump tubing
• Press the contact pressure lever 58 on the tubing cartridge
57 down as far as it will go.
• Release the tubing cartridge 57 from the holding clamp by
pressing down the snap-action lever 59 and remove from the
mounting pin.
• Remove the old pump tubing 61 or 64.
2 Insert the new pump tubing
• Insert the new pump tubing 61 or 64 in the tubing cartridge
57 as shown in Figure 8 or Figure 10. The stopper 62 must
click into the corresponding holder on the left-hand side of
the tubing cartridge.
• Place the tubing cartridge 57 on the mounting pin and press
down on the right-hand side until the snap-action lever 59
clicks into position on the holding clamp. Take care that no
kinks are formed on the pump tubing.
3 Set contact pressure
• Switch on the peristaltic pump.
• Press the contact pressure lever 58 upwards until the solution
just starts to be aspirated. Then press the contact pressure
lever upwards until it clicks once more to obtain optimal con-
tact pressure.
• Switch off the peristaltic pump.