Metrohm NIRS XDS SmartProbe Analyzer - Manual (Page 39)

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10. Gently wipe the surface with a laboratory
tissue to clean it. Do not abrade or pit the
surface in any way.
11. To re-install the reflectance standard and
the threaded plug, gently turn the Smart
Probe over onto the face of the module.
Place a towel or pad underneath to avoid
damaging the paint. Be very careful of the
fiber optic cable when placing in this
orientation.
In this position, the standard can be
inserted with minimal handling.
12. When the reflectance standard is clean, re-
insert it into the instrument opening.
Handle by the edges to avoid deposition of
oils onto the surface.
13. Re-install the threaded plug and snug
down.