User guide

2.3 Attaching the accessories
754 Dialysis Unit
15
Pump tubings are consumable material with a lifetime which depends
on the contact pressure. This is why the tubing cartridges should be
raised completely by loosening snap-action lever 88 on the right-hand
side if the pump is to remain switched off for a considerable length of
time (the set contact pressure remains unchanged).
The 6.1826.0X0 pump tubing is made of PVC and must not be used
for rinsing with solutions which contain acetone. In such cases, rinse
with different pump tubing or a different pump.
2.3.4 Assembling the dialysis cell
A dialysis membrane has to be inserted before the dialysis cell can be
placed inside the 754 Dialysis Unit. Proceed as follows (see Fig. 7):
1
Prepare dialysis cell
• Extract dialysis cell 3434 (6.2729.100) from its packaging and
remove the four 6.2744.060 dummy stoppers.
• Using the 6.2621.070 Allen key, completely loosen the 5
screws 3939, separate top part 3838 from bottom part 3535 and re-
move sealing ring 3636.
• Thoroughly rinse the sealing ring 3636, bottom part 3535 and top
part 3838 of the dialysis cell with ultrapure water and dry with N
2
or a lint-free cloth.
Use only ultrapure water or ethanol to clean the dialysis cell;
organic solvents (e.g. acetone) will cause damage to the plexiglas
cell !
2
Prepare dialysis membrane
• Use the 6.2831.010 pincette to extract a new dialysis mem-
brane 3838 (e.g. 6.2714.010) from its packaging and immerse
in a Petri dish containing ultrapure water for approx. 2 min
until the membrane is completely saturated with water.
3
Insert dialysis membrane
• Lay bottom part 3535 on a paper wipe with its inside facing
upwards.
• Insert sealing ring 3636 in the appropriate recess in bottom part
3535.
• Using the 6.2831.010 pincette, place the wet dialysis mem-
brane 3838 (e.g. 6.2714.010) inside the sealing ring 3636 on the
bottom part 3535.
Once saturated, take care that the dialysis membrane is not allowed to
dry out, otherwise it cannot be used any more !