Metrohm NIRS XDS RapidContent Analyzer - Manual (Page 34)

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The Rapid Content Analyzer may also be used for
liquid analysis using the Reflectance Cell and
Immersion Diffusers. These are often used for
clear to semi-clear liquids such as alcohols and
suitable fluids.
Removal of the Iris Adapter and re-installation of the Rapid Content Analyzer Sample Carrier is quite
straightforward. Simply remove the Iris Adapter Assembly, and re-install the Sample carrier onto the
locating pins. Re-install the thumbscrew and tighten hand-tight.
When re-installing the Sample Carrier,
be sure to reset the DCM “Cell” to
“Moving” as shown in the DCM at
right.
(Full information on the DCM is given
in section 6.0.)
5.3 Spot Size Adjustment
The Rapid Content Analyzer with Solids Module 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.
As a rule, a large spot size is preferable for large samples. This provides as much sample viewing area
as possible for a good cross-sectional area of the sample. The default spot size is 17.25mm.