Metrohm NIRS XDS SmartProbe Analyzer - Manual (Page 34)

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When instructed to scan the Wavelength Standard,
or the Calibrated Reference Standard, simply press
the door, and the holder will open.
Pull as far as it will come out, then insert the cup,
window side toward the probe.
Close door and insert the probe into the middle
aperture, against the sample cup.
5.2 Interactance Immersion Configuration
This is the Interactance Immersion (Liquid) Tip used
to sampling liquids such as alcohols and other
clear to semi-clear liquids. The path length of the
tip is set by use of a spacer, as shown in a later
frame.
Select the proper Tip type in the Data Collection
Method (DCM) in Vision.
(See section 6.0 for full information.)
Spacers are available for 2, 4, 5 and 10mm.
Note that the pathlength through the liquid
sample is 2X that of the spacer, since the energy is
transmitted through the sample to the mirror, then
back through the sample to reach the window to
carry the signal to the detectors.
The spacers give pathlengths as shown:
• 2mm spacer 4mm pathlength
• 4mm spacer 8mm pathlength
• 5mm spacer 10mm pathlength
• 10mm spacer 20mm pathlength