BUCHI Fraction Collector C-660 - Manual (Page 27)

6 Operation
27 C-660 Operation Manual, Version F
Table 6-9: Parameters for configurationm (cont.)
Parameter Description
Sensitivity The adjustment of various switching sensitivities. Range 4 shows the most sensitive,
Range 1 the most sluggish switching behavior.
This function enables adjustment of the collection function to the relevant slope of the
peak. Peaks with short elution times have steep flanks and the switching decision must
be correspondingly quick. Conversely, peaks with longer elution times have considerably
flatter flanks and are usually somewhat more agitated; such peaks require a more slug-
gish switching decision. The following serves as a rule of thumb:
- Use Range 3 for separations on small columns with diameters of 12...15, range 2 for
larger columns.
- Switch over to the next lower range if the peak detector switches too often. Switch
over to the next highest range if it switches too sluggishly or ‘overlooks’ unambiguous
switching criteria.
Min.
Min.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
time (min)
si
g
n
al
(
1000 m
V
=
100%
)
min
min
min
max
max
max
max
threshold
min
10 %
min
Fig. 6.7: Example diagram of a detection after peak minimum (min) and peak maximum (max) with a threshold of 10%.