
Delay volume
Description
The delay volume settings are used to make sure that the fractions collected during fractionation, using
the outlet valve or the fraction collector, correspond to the fractions indicated in the chromatogram.
The delay volume is the volume between the UV monitor, and the fraction collector or outlet that is
used, see the illustration below.
UV/Vis
pH
Valve
The time when a peak is detected
by the UV/Vis detector is called T
0
The peak reaches the fraction
collector at time T
1
Fraction collector
Conductivity
Delay volume
As the delay volume is affected by the length and diameter of the tubing, it should be set according
to the tubing and modules used.
Illustration of fraction marking using fixed volume fractionation
The illustration below shows the fractions collected, and the numerical marking of fractions, when
fixed volume (straight) fractionation is used with Fraction collector F9-R.
Volume
Absorbance
2 3 4
6 7 8 9
5
10 11 12 13 14 15 16 17 18 19
Fractionation marks shown in chromatogram
When fixed volume fractionation is used the delay volume is collected at the beginning of fractionation.
Fraction collector F9-R saves the delay volume in the first fraction (fraction 1), see the example illustration
above. Delay volumes are not indicated with a numerical fraction mark on the chromatogram.
Fraction collector F9-C does not save the delay volume as a fraction, instead the delay volume is dis-
posed of in the waste funnel.
If two fraction collectors are used, the fractions collected by Fraction collector F9-R, 2nd are
indicated by the prefix 2: (i.e. fractions 2:1, 2:2, 2:3 etc.).
Note:
208
ÄKTA pure User Manual 29119969 AB
5 Operation
5.8 Fractionation
5.8.3 Fractionation overview
Содержание AKTApure
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