Metrohm 838 Advanced Sample Processor Installation Instructions User 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.