Thermo Scientific VF-F20-A Operating Manual page 39

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3 Device Overview
Figure 6: Internal Needle Rinse in needle wash port with fraction
collection valve in collect position
Several draw and dispense strokes are executed during the purge flush
pump operation to fill the flow path from flush solvent container, flush
pump to flush buffer loop with fresh flush solvent.
Integral Fraction Collector FT (VF-F20-A) Operating Manual Page 39