4.2 Care and maintenance
62
Metrohm 838 Advanced Sample Processor
,
Service, maintenance, faults
Proceed as follows in order to exchange pump tubing:
1 Removing the old pump tubing
•
Press the contact pressure lever
49
on the tubing cartridge
down fully.
•
Detach the tubing cartridge
48
from the retaining bracket 50
by pushing the snap-action lever
51
in and disengage the
tubing cartridge from the retaining cam
53
on the 838 Ad-
vanced Sample Processor.
•
Remove the old pump tubing.
2 Fitting the new pump tubing
•
Insert the new pump tubing
56
(6.1826.xxx) into the tubing
cartridge. The stopper
57
must engage in the corresponding
fixture on the upper side of the tubing cartridge.
•
Engage the tubing cartridge in the retaining cam
53
and push
it at the rear to the front until the snap-action lever
51
en-
gages on the retaining bracket
50
. Ensure that the pump tub-
ing is not kinked when doing this.
3 Setting the contact pressure
•
Push the pressure lever
49
upwards until the solution is just
being aspirated. Then push the pressure lever 1 further detent
position up to achieve an optimum contact pressure.
Pump tubings made of PVC or PP may not be used to rinse with solu-
tions containing acetone. Use different pump tubings or use another
pump for rinsing in this case.
