Waters Prep Series Installation And Maintenance Manual page 22

For large-scale operations, inject sample through the manual pump inlet line,
the Rheodyne 3725i injector, or any available solvent delivery line.
Rheodyne 3725i injector
The Rheodyne 3725i injector incorporates a 20-mL fixed sample loop. The loop
volume and its valve passages precisely determined sample volume.
Column rack (Delta-Prep system)
The column rack (see the figure "System column rack (Delta-Prep system)" on
page 2-38) incorporates a small-scale (0.009-inch ID) and large-scale
(0.040-inch ID) tubing system for the small- and large-scale injectors. The
scale select valve lets you choose between the small-scale and large-scale flow
paths.
Small-scale flow path
When you select Small-Scale, solvent flows from the pump, through the purge
valve, and continues to the mixer. From there it goes to the Rheodyne 7725i
injector, the analytical column, the small-scale outlet port, and the detector.
Large-scale flow path
When you select Large-Scale, solvent flows from the pump, through the purge
valve, and continues to the mixer. From there it goes to the Rheodyne 3725i
injector, the preparative column, the large-scale output port, and the detector.
Purge valve
When you set the purge valve to Pump Purge, the purge valve directs flow to
the purge outlet. When set to System, it directs flow to the large-scale or
small-scale flow path via the scale select valve.
Injector panel (PrepLC system)
Mounted on a bilevel shelf assembly, the injector panel houses the Rheodyne
3725i injector and pump purge valve. The figure "Injector panel (PrepLC
system)" on page 1-13 shows the injector panel, indicating locations for the
optional Rheodyne 7725i injector and scale select valves.
1-12 Overview