Metrohm 872 Extension Module Suppression - Manual (Page 23)

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872 Extension Module Suppression ￭￭￭￭￭￭￭￭ 15
3.4 Peristaltic pump
3.4.1 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 (4-3) and the tub-
ing cartridge (4-5). During operation, the peristaltic pump drive rotates
the roller hub (4-2), so that the rollers (4-3) push the liquid forward in the
pump tubing.
6
1 4
3
2
5
7
Figure 4 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