Metrohm 833 IC Liquid Handling Unit User Manual download pdf (Page 98)

9 Troubleshooting - maintenance

830 IC Interface / Gebrauchsanweisung 8.830.1001

9.2.8 Ultrafiltration cell

The perfect condition of the filter membrane used is a necessary

requirement for the constant high quality of the analytical results, which

is why it must be replaced at regular intervals.

In order to asses the necessity of replacing the membrane please

consult Section 8.4.

To replace the filter membrane please proceed as follows (see also Fig.

22 in Section 8.2):

9.2.8.1 Replacing the filter membrane

1 Prepare ultrafiltration cell

• Loosen all capillary connections at ultrafiltration cell 66 by

unscrewing the PVDF compression fittings 64.

• Use the 6.2621.070 Allen key (5 mm) to completely loosen

the 5 screws 70, Separate upper part 67 from lower part 69

and remove sealing ring 72 and the used filter membrane.

2 Clean filtration cell, insert new filter membrane

and reassemble the cell

• See steps 2-6 Section 8.2 Assembling the ultrafiltration cell.

3 Connect filtration cell

• See steps 3-5 Section 8.3 Connect filtration cell.

4 Rinse ultrafiltration cell

• See also step 8 Section 8.3.

Each time that a new filtration membrane is inserted any air

that may still be contained in the filtration cell or tubing must

be removed. This is done by rinsing the cell and all the tubing

with e.g. ultrapure water:

• Immerse aspiration tubing 16 (see Fig. 24) in the rinsing

solution (degassed ultrapure water).

• Switch on the peristaltic pump in the «IC Net» software.

• Rinse the filtration system with ultrapure water for approx. 5

min. Check that the same amount of solution emerges from

both the waste outlets in the waste bottle.

• Check all tubing from the storage containers to the tubing

cassettes and filtration cell and up to the waste bottle for

leaks. If any leaks are found then the corresponding

connection must either be tightened up or replaced.

• If any air bubbles remain in the dialysis cell then screw off

PEEK capillary 80 (filtrate) from outlet 71 and the filtration cell

and wait until the air bubbles have vanished. Then screw the

tubing back onto the filtration cell again.

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 122 123

No comments

Metrohm 833 IC Liquid Handling Unit User Manual Page 98