Metrohm NIRS XDS Interactance OptiProbe Analyzer - Manual (Page 29)

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The probe barrel can be rinsed in a cleaning
solution, then rinsed with distilled (or de-ionized)
water to prevent sample carry-over from one
barrel to the next.
This should be written into the cleaning procedure
for the instrument. In the pharmaceutical industry,
a “cleaning validation” may be required.
NOTE: Any dirt or material carried on the probe
barrel may soil or damage the instrument
reference. This should be avoided!
When finished sampling, the probe should be
stored in the reference position. This is the proper
position for Performance Test, Gain Test, and
Wavelength Linearization.
Instrument Calibration makes use of an external
wavelength reference. The reference mounts in a
cup holder on the side of the instrument as shown.
(Leave room for easy access.)
Please see the section on Instrument Calibration
for full information.