2-40 Installing the System
system)” on page 2-39. The coils act as a spring, letting the column rack
slide open so that you need not disconnect the tubing from the Inlet
connector. They also keep the tubing compact and manageable. The
additional tubing nevertheless increases system volume, causing
additional delay time. At preparative flow rates, however, this volume
increase is insignificant and can even improve solvent mixing.
2. Install compression fittings on each end of the tubing (see “Liquid line
connections” on page 2-21).
3. Tighten fittings at the pump outlet and column rack Inlet connector.
Installing sample injection options
Installing the small-scale sample injection valve option (PrepLC
system)
If you expect to routinely inject sample volumes of less than 2-mL volume,
Waters recommends you use the small-scale manual injector valve option kit.
This kit includes these components:
• Rheodyne 7725i variable-volume injector valve assembly
• 100-µL loop assembly with fittings
• Inject start cable assembly
• Small/large scale select valve with label
• Fittings kit
To install the small-scale sample injection valve:
1. Remove the two blank-off plugs from the injector panel. Pressing them
outward, from behind.
2. Place the self-adhesive “small / large scale” label over the opening below
the existing “pump / purge” valve.
3. Fit the 2-way select valve in the “small / large scale” opening. The valve
must rotate through both positions.
4. Remove the injector handle from the main valve assembly by loosening
its two set screws.
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