INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 392)

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HAPSITE Smart Plus Operating Manual
NOTE: One of the column entries listed above must be highlighted to enable
editing of the Mass list for that specific Scan Set.
Mass . . . . . . . . . . . . . . . . . . . . . . . . The masses for each set are entered here in
a list. The title above the Mass column -
"Mass Measurements for Scan Set x" -
indicates which Scan Set is being edited.
Mass Width . . . . . . . . . . . . . . . . . . . This defines the number of points, the mass
spectrometer will scan, around the selected
mass in tenths of an AMU. For example, a
Mass Width of 0.6 will scan 0.3 on each side
of the peak centroid.
Extra . . . . . . . . . . . . . . . . . . . . . . . . This sets the number of extra scans, from 0 -
10, for each mass. Extra scans lower the
detection limits by increasing the intensity
within the Mass Spectrometer. Extra scans
should be used when scanning for ppb level
compounds. Do not set this for Internal
Standards because this will lower the
intensity from the other masses, causing loss
of possible target masses.
Dwell . . . . . . . . . . . . . . . . . . . . . . . . This is the amount of time the mass
spectrometer will sample data at each
sampling point. The dwell can be set from
100 µs - 5,000 µs. 400 µs is recommended.
Increasing the Dwell decreases the
detection limit.
Lead In. . . . . . . . . . . . . . . . . . . . . . . This determines the number of points the
mass spectrometer will skip prior to scanning
the desired mass peak. Best practice is to set
the Lead In to at least a 1000 µs delay prior
to collecting data. The delay is based on
Lead In multiplied by the Dwell.
NOTE: The Mass Width, Extra, Dwell and Lead In values for each newly entered
Mass are inherited from the value in the row above the new entry.
NOTE: To automatically fill any column, click in the desired cell and press Ctrl+D.
This automatically fills "down", with that cell’s value, to the end of the
column.