Metrohm NIRS XDS RapidLiquid Analyzer - Manual (Page 27)

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5
Rapid Liquid Module
The XDS™ Rapid Liquid Analyzer is designed for sampling of many types of customer samples. This
section describes initial calibration steps, which are detailed in section 7.1. This section gives a
functional overview, so the operation can be anticipated and understood.
5.1 Wavelength Calibration of the Rapid Liquid Analyzer
The Rapid Liquid Analyzer uses an innovative method of
wavelength calibration, to assure consistency between like
instruments. A wavelength standard, using materials with
known, stable peak positions, is used to calibrate the
wavelength scale of each instrument.
This wavelength standard is calibrated on a controlled
master instrument, and is characterized against SRM-
2035, a National Institutes of Standards and Technology
(NIST) transmission standard. This assures that wavelength
registration of each Liquid Analyzer is set to known
standards.
Instrument Calibration is required for transferability between instruments. It is activated under
Configure, Project Options in Vision Software. This feature is fully explained in section 7.1.3.
5.2 Blank Correction
The Rapid Liquid Analyzer has the option of “Blank
Correction” to provide an optimum photometric
match between instruments. Vision takes a spectral
scan of the sampling area (with spacer inserted), then
a spectral scan of the reference path. A correction
algorithm is applied to eliminate the slight difference
between sample and reference.
Blank Correction must be selected in Configure,
Project Options, in the screen shown at right.
A software algorithm applies the correction to each
spectrum automatically. This selection feature is fully
explained in section 7.1. Blank Correction is explained
in section 7.1.3.