Metrohm 2.942.0300, Manual, Page: 28 / 56

3.3 Peristaltic pump
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
20
￭￭￭￭￭￭￭￭
942 Extension Module Vario ChS-PP (2.942.0300)
Setting the contact pressure correctly
1
￭
Fully loosen the contact pressure lever , i.e. press it all the way
down.
￭
In the software, activate the drive of the peristaltic pump with the
desired speed.
￭
Raise the contact pressure lever one step at a time until liquid
flows.
￭
When liquid starts flowing, raise the contact pressure lever by an
additional two ratchet increments.
The contact pressure is now set optimally.
3.3.2 Mode of operation for 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 based on the principle of displace-
ment. The pump tubing is clamped between the rollers
(8- 5 ) and the tub-
ing cartridge (8- 2 ) . During operation, the peristaltic pump drive rotates
the roller hub (8- 6 ) , so that the rollers (8- 5 ) advance the liquid in the
pump tubing.