Metrohm 833 IC Liquid Handling Unit - Manual (Page 88)

9 Troubleshooting - maintenance
833 IC Liquid Handling Unit / Instructions for Use 8.833.1003
80
Dialysis cell
To shut down the dialysis cell the acceptor and sample channels must
be rinsed with ultrapure water for approx. 10 min. The inlet and outlet
tubing is then screwed off from the dialysis cell and openings 49, 50,
51 and 52 (see Fig. 15) are each closed with a 6.2744.060 Blank
stopper.
If the dialysis system is not to be used for a long time then the dialysis
membrane must be removed and the cell has to be cleaned, see
Section 9.2.7.1 and Fig. 15.
Filtration cell
If the filtration cell is not to be used for a long time then must be rinsed
with ultrapure water for approx. 10 min. The inlet and outlet tubing is
then screwed off from the filtration cell and openings 71, 73 and 74
(see Fig. 22) are each closed with a 6.2744.060 Blank stopper.
9.2.4 Replacing the pump tubing
The pump tubing is a consumable with a limited working life, which is
why it should be replaced at regular intervals (approx. every 2 weeks for
continuous use).
The working life of the pump tubing depends primarily on the contact
pressure. This is why you should set the contact pressure correctly as
described in Section 3.2 and lift up the tubing cassettes completely
when the pump is switched off for a long time releasing spring lever 7
on the right-hand side (this means that the optimally set contact
pressure is retained).
As the pump always operates with the same direction of rotation this
means that the supplied 6.1826.0X0 Pump tubing can be used on both
sides. The pump tubing is replaced as follows:
1 Remove old pump tubing
• Press contact lever 5 on the tubing cassette down as far as it
will go.
• Loosen tubing cassette 4 from holding clip 6 by pressing
down spring lever 7 and unhinge it from the holding pin 2 on
the 833 IC Liquid Handling Unit (see Fig. 1).
• Remove the old pump tubing.
2 Insert new pump tubing
• Insert new pump tubing 19 (6.1826.0X0) in the tubing
cassette as shown in Fig. 7. Stopper 20 must click into
position in the corresponding holder on the left-hand side of
the tubing cassette.
• Hinge the tubing cassettes on holding pin and press down
on the right-hand side until spring lever clicks into position in
holding clip 6. Take care that the pump tubing does not kink.