Combi Flash 7650 Series Manual do Utilizador descarregar pdf (Página 97)

Section 4 User Help Reference

4-17

Time Windows can limit the fraction collection to specific

time durations of the run. To use time windows, first

enter a start time and an end time. Note that all times

are relative to start of the run, just following the sample

injection. Then choose a peak collection mode. If you

select Peaks the module will collect fluid only when the

time window is active and a peak is present. If you select

All the module will collect all fluid during the time

window regardless of the peak state. Define up to three

time windows.

• Air Purge — Type or select the duration of a post-run

air purge, in minutes. An air purge clears the solvent

from the column and the fluid path, forcing any liquid

out the waste port. If you are disposing the column after

each run, a sufficient post-run air purge ensures that it

will be empty. To disable the air purge, enter a value of 0

(zero). A column can also be manually air purged. See

ANUAL CONTROL [4.3.9].

4.3.2.3 Run Notes

Use this text entry box to enter comments or notes for the run.

These comments will be saved with the run and will appear in

TXT and PDF reports.

4.3.2.4 Gradient Plot Area

The gradient plot area depicts the current gradient profile

that will be used for the run. The X-axis of the plot displays

the run time in minutes or C

OLUMN VOLUMES [ON-LINE]. The

X-axis scale can be adjusted by typing or selecting the Run

Length. The left Y-axis displays absorbance units and the

right Y-axis indicates the percentage of solvent B.

The gradient plot area also provides a convenient method to

edit the gradient curve. You can click and drag any of the

points to change the shape of the curve, or use the buttons at

the bottom of the plot area to insert and delete points. The

following controls appear in the Gradient Plot Area:

• Insert — Click this button to enable the gradient point

insert mode. When this mode is active, click the gradient

curve to add a single point. You can then drag the new

point to any desired position. Click the insert button

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Combi Flash 7650 Series Manual do Utilizador Página 97