Metrohm 838 Advanced Sample Processor Installation Instructions - Manual (Page 68)

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.