Metrohm NIRS XDS SmartProbe Analyzer - Manual (Page 35)

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The reference scan is taken with the Interactance
Immersion Tip located in the lowermost aperture
on the front of the instrument, as shown.
Click on the reference icon in Vision. Position the
probe fully into the aperture and squeeze the
trigger when instructed.
When placing the Interactance Immersion (Liquid)
Tip into the sample, angle it slightly to avoid
trapped bubbles between the mirror end and the
sample window. Bubbles will change the spectral
readings.
Cleaning is similar to the Interactance Reflectance
end. Use a suitable cleaning solution, then rinse
with distilled water to prevent sample carry-over
from one sample to the next.
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.