Metrohm 872 Extension Module Liquid handling - Manual (Page 37)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
5 Installation
872 Extension Module – Liquid handling
￭￭￭￭￭￭￭￭ 29
5.5 Peristaltic pump
5.5.1 Principle of the peristaltic pump
The Peristaltic pump is used for pumping sample and auxiliary solutions. It
can rotate in both directions.
The peristaltic pump pumps liquids according to the principle of displace-
ment. The pump tubing is clamped between the rollers (18-3) and the
tubing cartridge (18-5). During operation, the peristaltic pump drive
rotates the roller hub (18-2), so that the rollers (18-3) push the liquid for-
ward in the pump tubing.
6
1 4
3
2
5
7
Figure 18 Peristaltic pump
1 Knurled screw in the mounting pin 2 Roller hub
3 Rollers 4 Cartridge holder
5 Tubing cartridges 6.2755.000 6 Contact pressure lever
7 Snap-action lever