Metrohm NIRS XDS SmartProbe Analyzer - Manual (Page 38)

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5. Lift the sample drawer upward, out of the
way. (Hold in this position.)
6. Using a large flat-bladed screwdriver,
loosen the large (3/4”) threaded plug inside
the instrument opening.
A larger screwdriver than the one shown is
preferable. A small screwdriver is shown to
give the best view of the threaded plug.
When the plug is loose, hold the
screwdriver blade horizontal (as shown) to
lift the threaded plug out of the unit.
7. Remove the plug.
8. The white object inside the opening is the
reflectance standard.
9. Reach in with a tissue, then press the
reflectance standard out from the other
side -- insert the Smart Probe gently into
the reference position. The standard should
pop out into the tissue.