Metrohm 793 IC Sample Preparation Module - Manual (Page 35)

4.2 Maintenance and servicing
793 IC Sample Prep Module/ 8.793.1003 Instructions for Use
31
4.2.4 Exchanging the pump tubing
Pump tubings are consumable 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 correctly
set as described in section 2.3.2 or 2.4.2 respectively. If the pump is to
remain switched off for a lengthy period of time the tubing cartridges
should be raised completely by loosening snap-action lever 10 10 10 10 on the
right-hand side (the set contact pressure remains unchanged).
As the pump is always operated on the same side the pump tubings
6.1826.010 supplied can be used on both sides. To exchange a pump
tubing proceed as follows:
1 Remove old pump tubing
x Press contact pressure lever 5 555 on the tubing cartridge down
as far as it will go.
x Release tubing cartridge 4
444 from holding clamp 9999 by pressing
down snap-action lever 10 10 10 10 and remove from mounting pin 12 12 12 12
on the 793 IC Sample Prep Module (see Fig. 1).
x Remove old pump tubing.
2 Insert new pump tubing
x Insert the new pump tubing 33
33 33 33 (6.1826.010) in the tubing
cartridge as shown in Fig. 7. The white-white stopper 34 34 34 34 must
click into the corresponding holder on the left-hand side of
the tubing cartridge.
x Place the tubing cartridge on mounting pin 12
12 12 12 and press
down on the right-hand side until snap-action lever 10 10 10 10 clicks
into position on holding clamp 9 999. Take care that no kinks are
formed in the pump tubing.
3 Set contact pressure
x Press contact pressure lever 5
555 upwards until the solution just
starts to be drawn in. Then press contact pressure lever up-
wards until it clicks once more to obtain optimal contact pres-
sure.