Metrohm 882 Compact IC plus – Anion – MCS - Manual (Page 49)

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3 Installation
882 Compact IC plus – Anion – MCS
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Position B In the position INJECT, the eluent flows through
the sample loop to the separation column. If
sample solution is to be found in the sample
loop at the time of the valve switchover, then
this will be conveyed along with the eluent, thus
making its way to the separation column. The
flow in the sample path is either stopped or the
sample flows directly to the waste container.
3.12.3 Selecting the sample loop
The amount of sample solution injected depends on the volume of the
sample loop. The choice is made on the basis of the application. The fol-
lowing sample loops are normally used:
Cation determination 10 µL
Anion determination with suppression 20 µL
Anion determination without suppression 100 µL
3.13 Peristaltic pump
3.13.1 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 (20-3) and the
tubing cartridge (20-5). During operation, the peristaltic pump drive
rotates the roller hub (20-2), so that the rollers (20-3) push the liquid for-
ward in the pump tubing.