Metrohm 940 Professional IC Vario ONE/ChS/PP - Manual (Page 51)

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3 Installation
940 Professional IC Vario ONE/ChS/PP (2.940.1300)
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Setting the contact pressure correctly
1 ￭ Fully loosen the contact pressure lever , i.e. press it all the way
down.
￭ Activate the peristaltic pump drive in the software.
￭ 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.
3.14.2 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 (14-5) and the
tubing cartridge (14-2). During operation, the peristaltic pump drive
rotates the roller hub (14-6), so that the rollers (14-5) advance the liquid
in the pump tubing.