Metrohm NIRS XDS MultiVial Analyzer - Manual (Page 32)

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Upon selection of “More”,
Vision shows key dimensions
of the tray, needed for
fabrication.
Click on “Print Coordinates”
to see additional dimensions.
These dimensions are the center of each vial
opening in the tray. Vision uses these
coordinates to position each vial during
sampling.
Note that there are other important
dimensions, including the vial “support ledge”,
and the flatness of the final tray. Because the
fabrication is critical to repeatability, Metrohm
NIRSystems does not recommend local
machining.
Please contact your Metrohm NIRSystems
Distributor for ordering information.
You will need to supply both screens shown, as
the final tray will be machined to these
specifications.
A charge applies for each custom tray supplied.
5.3 Spot Size Adjustment
The MultiVial Analyzer offers spot size adjustment, which permits the user to set the relative size of
the illumination beam that strikes the sample. This is useful for small objects such as 15mm vials
(about 5ml volume), tablets, and other small-diameter materials. The instrument energy is focused
into a smaller area, providing better intensity within the area of interest. This generally provides
improved signal-to-noise on small samples. In the Data Collection Method (DCM) shown below, the
spot size is entered as 12mm, for a 15mm vial.
NOTE: The spot size (set in the Data Collection Method) should be no larger than 80% of the vial
diameter. For each default vial size in the Select Tray Dialog box, set spot size as follows:
• 15mm vial: 12mm spot size