Metrohm NIRS XDS Interactance OptiProbe Analyzer - Manual (Page 32)

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When finished sampling, the probe should be
stored in the reference position. The probe end is
protected from ambient light in this position. The
end should be clean and dry when placed into the
holder, to avoid drips and puddling inside the
assembly. A small drain hole is provided, primarily
to protect the instrument from accumulated drips.
This is the proper position for Performance Test
and Gain Test using the Interactance Immersion
(Liquid) End.
Reference Standardization is not technically
required for the Interactance Immersion tip,
because air is used as a reference, and it is
assumed to be 100% transmissive.
However, Reference Standardization is required for
Instrument Calibration, and should be selected in
Configure, Options.
Instrument Calibration must be performed in the
Reflectance mode. After mounting the
Interactance Immersion tip, run Wavelength
Linearization if Auto-Linearization is selected under
Project Options.
Always follow these guidelines when handling sample materials:
1. Always use appropriate safety equipment with hazardous materials, to prevent injury. This
equipment may include safety glasses, gloves, lab apron, and fume hood. Always check the
MSDS (Material Safety Data Sheet) for the materials being analyzed for recommended
handling precautions.
2. When inserting the reflectance tip into powdered samples, try to press it consistently each
time. This provides fairly uniform “sample packing” in front of the sample window, and gives
minimal baseline differences in spectra.
3. Be sure the probe end is not at the extreme edge of the container, where sample material
may be thin. The probe should always see “infinite thickness” of powder for best operation.
This varies with material, but 13mm or 1/2” is generally considered sufficient.