Metrohm NIRS Analyzer PRO - Manual (Page 7)

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Introduction
Analyzer PRO is a rugged, compact Near-Infrared Process
Instrument, designed for the wavelength range from 1100-1650
nanometers. This is an excellent region for process analysis,
containing many second and third overtones of molecular
vibrations which can be measured.
The instrument is based upon high-resolution diode array
technology. The InGaAs diode array, with spectral dispersion of
1.1 nm/pixel, is a stable, intrinsically accurate method of NIR
absorbance measurement. It offers excellent peak shape
resolution, and contains no moving parts. Therefore, no
wavelength accuracy adjustment is needed, as there is no
measurable drift.
Sampling systems are as follows:
• Window Reflectance, where the sample passes in contact with the window on the side of the
instrument
• Reflectance Probe, using a 1” (25.4mm) diameter stainless steel probe
• Direct Light Reflectance, where the sample passes at a distance of 4-10 inches
(approximately 100-250mm) from the window
The analyzer is housed in a robust cabinet, designed for easy, reliable mounting at the desired
location in the production area. Mounting is simplified by use of industry-standard stainless steel
clamps, which facilitate installation and removal, as well as good positioning of the analyzer to the
sample.
The instrument may be mounted in any orientation, as long as the sample window is in the proper
location. The sample interface is normally placed at a point of production where the product is
pumped through a pipe, dryer, blender, or other feed mechanism. There should be no (or very few)
gaps or voids in the product flow, as these will cause measurement instability.