Accuracy, Repeatability and Reproducibility of Litesizer DIF 500
This application report provides a better insight into the requirements of the ISO13320:2020 for laser diffraction regarding accuracy, repeatability and reproducibility and shows how the Litesizer DIF 500 is capable of fulfilling them.
Importance of the accuracy and repeatability
Laser diffraction technique describes a three-dimensional object with a single value of length, the ‘equivalent spherical diameter (laser diffraction)’ based on the assumption that particles are spherical (1).
Therefore, in case of a collection of irregularly shaped particles laser diffraction instruments calculate the particle size distributions by comparing the diffraction patterns deduced for spheres to those measured for irregular particles. Consequently, the measurement result is a distribution of spherical particles that ‘fit’ to the light scattered from the “irregularly shaped objects” (1). Each irregular particle may present itself in different orientations and, those different resulting cross-sections will have different scattering features. For this reason, the equivalent spherical diameters reported for non-spherical particles depend on the correct operation of the instrument which has to be confirmed by a qualification procedure. In laser diffraction particle size analysis, ensuring reliable and consistent results is critical for quality control, research, and regulatory compliance. According to ISO 13320:2020 the international standard governing laser diffraction methods, the concepts of accuracy, repeatability, and reproducibility are central to evaluating the performance and reliability of the measurement system.
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