Waters ACQUITY UPC2 - Page 31

November 16, 2016, 715004521 Rev. C
Page 31
Figure 2–8: Step 6: Auxiliary valve introduces sample into the liquid CO
2
system
The auxiliary valve rotates to the inject position and allows mobile phase to pass through the
injection valve. This introduces sample into the high pressure liquid CO
2
system, and injects the
sample onto the column.
Waste
Waste
Auxiliary valve (inject position)
Metering syringe
Injection valve (inject position)
Sample
Liquid mobile phase (CO
2
)
Gas mobile phase (CO
2
)
Air gap
Buffer volume
Sample
Weak wash
From pump
To col umn
Sample loop
Sample