Metrohm 919 IC Autosampler plus - Manual (Page 34)

4.3 Peristaltic pump
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919 IC Autosampler plus
4.3 Peristaltic pump
The flow rate of the peristaltic pump depends on the drive speed, the con-
tact pressure and, above all, the inner diameter of the pump tubing.
Depending on the application, different pump tubing is used.
CAUTION
The lifetime of the pump tubings also depends on the contact pressure.
Therefore, lift the tubing cartridges by loosening the snap-action lever if
the peristaltic pump is to be switched off for a longer period. This
ensures that the contact pressure will be maintained once it has been
set.
CAUTION
The 6.1826.xxx pump tubings are made of PVC or PP and therefore
must not be used for rinsing with solutions containing acetone. In this
case, use different pump tubing or use another pump for rinsing.
4.4 Pump tubings
Pump tubings used for the peristaltic pump are consumables with a lim-
ited lifetime.
LFL pump tubings with three stoppers are inserted into the tubing car-
tridge in such a way that the cartridge is located between two stoppers.
This results in two possible positions for the tubing cartridge. If the pump
tubing was to show pronounced signs of wear, you can insert it a second
time in the other position.
Replace the pump tubings periodically, approx. every four weeks if used
continuously.
Pump tubing selection
Pump tubing can differ in terms of material, diameter and thus flow rate.
Different pump tubing is used depending on the application.
The following table shows the properties and areas of application of the
pump tubings: