Metrohm NIRS XDS SmartProbe Analyzer - Manual (Page 37)

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levels have been reached. Because a cleaning validation is sample-specific, Metrohm cannot
recommend detailed cleaning methods for such samples.
5.3 Cleaning of internal reflectance reference
The internal reflectance reference is a small piece of 99% reflectance (nominal) Spectralon™. This
material is quite rugged, non-hygroscopic, and stable with temperature.
In spite of these qualities, the internal reflectance reference can become contaminated. This chiefly
occurs through foreign materials becoming lodged on the end of the Smart Probe, then deposited on
the internal reflectance reference when the probe is placed into the reference position.
It is important to always clean the Smart Probe tip before placing into the reference position. Never
leave any sample material on the end. It is wise to clean the end thoroughly, then wipe dry with a
non-linting laboratory tissue or other type of wipe.
To clean the internal reflectance reference, follow these steps:
1. Remove the Smart Probe from the
reference position, and place it in a secure
place where it will not fall or be damaged.
2. Lift the release handle, then remove the
Smart Probe module from the
monochromator.
3. Gently lift the module onto its left side,
with the blue housing upward.
4. Gently pry the large black cap off the back
of the module as shown.