Metrohm 858 Professional Sample Processor - Manual (Page 50)

4.4 Peristaltic pump ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
42 ￭￭￭￭￭￭￭￭ 858 Professional Sample Processor
2 Insert the filter
￭ Place the filter in the tubing olive and press flat.
3 Mount the filter screw
￭ Screw the filter screw back into the tubing olive.
4.4 Peristaltic pump
The flow rate of the peristaltic pump depends on the drive speed, the con-
tact pressure and, above all, the inner diameter of the pump tubing.
Depending on the application, different pump tubings are used.
Caution
The lifetime of the pump tubings also depends on the contact pressure.
Therefore lift the tubing cartridges by loosening the snap-action lever if
the peristaltic pump is to be switched off for a longer period. This
ensures that the contact pressure, once it has been set, will be main-
tained.
Caution
The 6.1826.xxx pump tubings consist of PVC or PP and therefore must
not be used for rinsing with solutions containing acetone. In this case,
use other pump tubings or use another pump for rinsing.
4.5 Pump tubing
The pump tubing used in the peristaltic pump is a consumable whose
service life is restricted.
The LFL pump tubing with 3 stoppers is stretched in the tubing cartridge
in such a way that it comes to rest between two stoppers. This results in
two possible positions for the tubing cartridge. If the pump tubing should
exhibit clear signs of wear, then this can be stretched a second time, in
the respective alternate position.
Therefore replace the pump tubing periodically, or when used perma-
nently approx. every 4 weeks .