INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 403)

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HAPSITE Smart Plus Operating Manual
Peak Resolution (dx) . . . . . . . . . . . This number indicates the minimum number
of scans between two peaks which is used to
determine whether to split a peak into two or
consider it as one peak.
Noise Level Mult . . . . . . . . . . . . . . . A peak intensity must be greater than this
number multiplied by the baseline noise in
order to be called an analyte.
Min. Area . . . . . . . . . . . . . . . . . . . . . This number discriminates against low
responses which are usually attributed to
noise rather than detection of the analyte.
Increase this number to 10,000 or more if
false hits are encountered.
Min. Width . . . . . . . . . . . . . . . . . . . . This number specifies the minimum number
of scans to comprise a peak. This is another
discrimination against low responses or
noise.
Max Width . . . . . . . . . . . . . . . . . . . . This number specifies the maximum number
of scans to comprise a peak. This allows
discrimination against a very broad peak.
Precedence Level . . . . . . . . . . . . . . When compared to the compound-specific
precedence level, it determines which search
parameters to use — the global parameters
specified in
Figure 11-37 or the
compound-specific parameters. As a general
rule, leaving this set to 0 allows one to use
specific search parameters for individual
compounds as discussed in
Chapter 12 .
Min. Fit. . . . . . . . . . . . . . . . . . . . . . . This compares the expected mass intensities
relative to each other to those saved in the
library. Reasonable values depend on how
selective the calibration, but typically 0.5 to
0.9 is used. This value is a way of lowering
false positives, where a higher number is
more discriminative.
Min. Purity . . . . . . . . . . . . . . . . . . . . This measures the purity level of the peak
detected compared to the mass peak in the
library. Reasonable values depend on how
selective the calibration, but typically 0.5 to
0.9 is used. This value is a way of lowering
false positives, where a higher number is
more discriminative.