Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 8)

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the sections on Reference Standardization.
This instrument uses near-infrared (NIR) spectral energy to illuminate the sample. By measuring the
energy reflected off (or passing through) the sample, chemical information and composition may be
determined. This information may be used for quantification of constituents, or for comparison to a
library of known materials, providing identification and qualification of materials.
Vision Software™ offers an easy user interface, using the familiar screens and methods provided with
previous generations of NIR instrumentation. All functions required to perform identification,
qualification, and quantitation are provided, with easy tools for interpretation of results. Vision offers
full instrument diagnostics, with built-in acceptance specification tables for all tests. Vision stores all
results in a diagnostic database for later lookup, with control chart views of results tracked over time.
The menu-driven, validated Vision Software package meets all requirements of CFR 21 Part 11,
covering Electronic Records and Signatures. Vision comes with a full manual for operation and theory
of operation, with complete instructions for analytical development.
The XDS Analyzer provides 0.5nm data points, and uses several innovative methods to assure
wavelength accuracy and repeatability. Reflectance wavelength positions are directly traceable to
NIST SRM-1920a. Because SRM-1920a does not have certified wavelengths above 2000 nm, an
additional wavelength absorber is included in the calibration standard, to provide stable wavelengths
beyond 2000 nm. These additional wavelengths have been independently measured on calibrated
instrumentation to ascertain the wavelength positions used.
Transmission wavelengths are directly traceable to NIST SRM-2035.
A panel of 6 LED indicators provides information to the user on these functions:
Icon Status
Green when power is ON
Amber when connected to network or direct
connection
Green when instrument lamp is ON
Red when scanning reference or sample
Green when stable operating temperature is reached
Green when module is properly attached
Instrument communication uses RJ-45 network connections, to eliminate issues involved with long
runs of RS-232 cable. A dynamic Internet Protocol (IP) address is requested upon instrument power-
up. If no DHCP server is available, the instrument defaults to an internal IP address for direct
connection using a “crossover cable”, supplied with the instrument. Network RJ-45 connection also
permits remote interrogation and diagnostics checks of the instrument, if necessary and authorized.
Note that various permissions are required for proper installation and use.