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Measure Moisture Content in Granules with NIR Spectroscopy

Posted on: September 28th, 2023

Near-infrared (NIR) spectroscopy is a highly valuable and widely utilized technique for real-time moisture content measurement in various substances. Its non-destructive, rapid, and precise results have made it indispensable across diverse industries such as Pharmaceutics, Food, Chemistry, Agriculture, and Construction. It is important to emphasize that the calibration model for moisture measurements using NIR spectroscopy is material-specific and critical to ensure the accuracy and reliability of moisture predictions. Therefore, distinct calibration models are required for different types of granulates or sample matrices. For instance, the measurement of moisture content in silica granulates used in the rubber industry serves as an illustrative example in this application note.

For cases where moisture bands are clearly present and above a few percent, the recommended setup includes the Avaspec-NIR256-1.7-EVO in combination with the Avalight-Hal-s-Mini2 and FCR-7UVIR400-2-BX fiber. On the other hand, when dealing with low concentrations of moisture, challenging sample discrimination, or the presence of multiple components, the suggested setup involves using the Avaspec-NIR256-2.5-HSCEVO with the same accessories. Once a reliable chemometric model is established and the actual moisture is determined, it becomes feasible to correlate different moisture levels with water bands. By leveraging the Avantes NIR spectrometer alongside the chemometric model, an efficient, non-destructive, and accurate moisture detection system can be achieved.