Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 89)

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After the linearization is successfully sent to the
instrument, this message confirms the transfer.
Click “OK” to proceed.
11.4.3 Reference Standardization, Transmission Probes
Reference Standardization with Transmission Probes uses an innovative means to adjust each channel
to a repeatable, transferable level of spectroscopic response. The fiber ends are placed into a fixture,
the response is measured, and the signal is “normalized” using a spectral correction.
This shows the fixture. When Reference
Standardizing, this fixture holds the two probes in
alignment, at a pre-determined distance.
The optical response of the air gap is measured
and stored. A correction is applied, to bring the
channel to “0 Absorbance” in transmission,
corresponding to the response of an air reference.
This fixture is also used in Instrument Calibration.
Follow these instructions to perform Reference Standardization:
1. Insert each probe into the fixture as
shown.
2. Tighten the thumbscrew gently on the
probe.