200 1100 Series WS MWS Reference Manual
6 Introduction to the Well-plate Sampler
Sampling Sequence
The movements of the well-plate sampler components during the sampling
sequence are monitored continuously by the well-plate sampler processor. The
processor defines specific time windows and mechanical ranges for each
movement. If a specific step of the sampling sequence is not completed
successfully, an error message is generated. Solvent is bypassed from the
well-plate sampler by the injection valve during the sampling sequence. The
needle moves to the desired sample vial position and is lowered into the
sample liquid in the vial to allow the metering device to draw up the desired
volume by moving its plunger back a certain distance. The needle is then
raised again and moved onto the seat to close the sample loop. Sample is
applied to the column when the injection valve returns to the mainpass
position at the end of the sampling sequence.
Figure 30 Overview of the well-plate sampler
MTP board
Sample
transport
Analytical
head
Peristaltic
pump
Needle seat
Switching
valve
Sampling
unit
Power supply
Vial tray
Needle
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