Metrohm 753 Suppressor Module - Manual (Page 31)

4 Malfunctions – Maintenance
753 Suppressor Module / 8.753.1003 Instructions for Use
28
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 2 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 2.3.2 or 2.4.2 respectively. If the pump
is to remain switched off for a lengthy period of time the tubing car-
tridges should be raised completely by loosening snap-action lever 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
6.1826.050 supplied can be used on both sides. To exchange a pump
tubing proceed as follows:
1 Remove old pump tubing
• Press contact pressure lever 55 on the tubing cartridge down
as far as it will go.
• Release tubing cartridge 44 from holding clamp 99 by pressing
down snap-action lever 10 10 and remove from mounting pin 12 12
on the 753 Suppressor Module (see Fig. 1).
• Remove old pump tubing.
2 Insert new pump tubing
• Insert the new pump tubing 33 33 (6.1826.050) in the tubing
cartridge as shown in Fig. 7. The white-yellow stopper 34 34
must click into the corresponding holder on the left-hand side
of the tubing cartridge.
• Place the tubing cartridge on mounting pin 12 12 and press
down on the right-hand side until snap-action lever 10 10 clicks
into position on holding clamp 99. Take care that no kinks are
formed in the pump tubing.
3 Set contact pressure
• Press contact pressure lever 55 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.