30/10/2026
Why Does the Model Still Need "Upkeep" After the NIR Instrument Arrives?
Many people assume that once an NIR instrument is purchased and a model is installed, it can measure directly. In reality, the instrument measures spectra; what translates spectra into component values is the calibration model behind it.
🔍 The model only recognizes the "patterns" it has seen
Even for the same wheat, Australian and Chinese varieties differ in protein structure and particle size distribution. A model built with samples from location A may show significantly larger deviations when used on samples from location B—not because the instrument is inaccurate, but because the model has never seen your samples.
🛠️ Localization is a must
Build or adjust the model using samples from your region and the raw materials you actually process. The closer the model's coverage is to your real samples, the more reliable the predictions.
🔄 Models also need ongoing maintenance
Raw materials change, varieties are updated, and light sources age. Regularly validate the model with reference methods; if deviations exceed the acceptable range, add new samples and update the model. This is not an instrument quality issue, but an inherent property of NIR as a secondary analysis method—it always relies on reference data to anchor itself.
💡 So when selecting an instrument, beyond specifications, ask clearly: How is the model built? How are local samples involved? How is ongoing maintenance supported?