Teledyne Foxy R1, Instruction Manual

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Foxy
®
R1 and Foxy
®
R2 Fraction Collectors
Section 3 Programming
3-17
Note
If you are using only threshold detection, select either the
Union (OR) or Intersection (AND) option. Ensure that the peak
width detection is set to None.
5. Touch the Enter icon to return to the Method Settings
menu.
3.3.6 Peak Width Detection Peak Width detection isolates small and large magnitude peaks.
The Peak Width is set as the average time duration of the
expected peaks. The fraction collector monitors the slope of the
input signal. (Peak width detection is also commonly called Slope
detection.) If the rising signal is consistent with that of a peak,
the fraction collector isolates the fluid. In a similar way, the
falling slope as it transitions to the baseline indicates the end of
a peak. The internal slope detection algorithms are effective in
isolating multiple “shouldered,” peaks — peaks that do not
return to the baseline before the next peak occurs.
The peak width option is useful to eliminate false peaks that can
result from a rising or noisy baseline.
An example of Peak Width detection and collection is shown in
Figure 3-15. The peaks on the analog signal are numbered 1
through 4. The fraction collector isolates peaks 1 through 3 in
collection tubes because of the slope of the peak signal. Peak 4 is
ignored because the signal does not indicate a slope within the
programmed peak width setting.
Figure 3-15 Peak Width detection cuts peaks when
internal slope algorithms indicate a peak
To program the fraction collector for Peak Width detection:
1. Touch the Peak Width Detection icon from the Method Set-
tings menu to open the threshold menu (Figure 3-16).
Time Isolated Peaks (grey)
P
e
rcen
t
1
2
3
4