Metrohm 940 Professional IC Vario ONE/SeS/PP/Prep 1 - Manual (Page 104)

5.13 Peristaltic pump
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940 Professional IC Vario ONE/SeS/PP/Prep 1 (2.940.1510)
5.13 Peristaltic pump
5.13.1 Notes on operating the peristaltic pump
The flow rate of the peristaltic pump depends on the drive speed (set
using the software), the contact pressure and, above all, the inner diame-
ter of the pump tubing. Depending on the application, different pump
tubing is used. Select pump tubing that best matches your application (see
Table 2, page 37).
CAUTION
The lifetime of the pump tubing primarily depends on the contact pres-
sure.
If the peristaltic pump is switched off for long periods, lift up the tubing
cartridges on the right side by releasing the snap-action levers. This
ensures that the contact pressure will be maintained once it has been
set.
CAUTION
The pump tubing (6.1826.xxx) is made of PVC or PP and therefore must
not be used for rinsing with solutions containing organic solvents. In
this case, use different pump tubing or use another pump for rinsing.
5.13.2 Servicing the peristaltic pump
5.13.2.1 Replacing the pump tubing
Pieces of pump tubing inserted into the peristaltic pump are consumables
with a limited lifetime.
Pieces of pump tubing with 3 stoppers are tensioned in the tubing car-
tridge so that they end up positioned between two stoppers. This results
in two possible positions for the tubing cartridge. Once the pump tubing
exhibits significant signs of wear, it can be tensioned a second time in the
other respective position.
Maintenance interval Replace the pump tubing every 2 months.
Replace the pump tubing every 4 weeks if the peristaltic pump is being
used continuously.