Metrohm Inline-Ultrafiltration - Manual (Page 26)

4.2 Maintenance
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20 ￭￭￭￭￭￭￭￭
IC equipment: Inline-Ultrafiltration
1 Nominal pore size according to manufacturer's statement.
2 Except for this membrane, all membranes were from the same manufac-
turer.
Please also note that because of the lower filter thickness the retention
capacity of filtration membranes may be lower than that of filters with the
same pore size but a higher filter thickness. You should take this into
account when selecting an appropriate filtration membrane.
4.2 Maintenance
The filtration membranes used have to be in perfect condition in order to
enable a consistent quality of the analysis results. Therefore, this mem-
brane has to be replaced at regular intervals.
Additional information on estimating when a filtration membrane needs
to be replaced can be found in Chapter 4.1.1.
Replacing the filtration membrane
1 Taking the ultrafiltration cell out of the system
￭ In the software, stop the system and wait until the pressure has
been released.
￭ Remove all capillaries from the ultrafiltration cell.
￭ Take the ultrafiltration cell out of the holder.
2 Cleaning the ultrafiltration cell
￭ Carry out steps 2 to 8 in the instructions Inserting the filtration
membrane on page 7.
3 Connecting capillaries to the ultrafiltration cell
CAUTION
Damage to the ultrafiltration cell caused by using the
wrong pressure screws
PEEK pressure screws are too hard and could damage the ultrafil-
tration cell material.
￭ Use only PVDF pressure screws (6.2744.000) to tighten capilla-
ries to the ultrafiltration cell.