ISO 23291 I IDF 248: 2020 - Milk and milk products - Guidelines for the application of in-line and on-line infrared spectrometryThis document gives guidelines for using infrared spectrometry in in line and on line applications for dairy processing. These applications are distinct to those covered in ISO 21543 IDF 201. It is applicable, but not limited, to: the determination of protein, fat and total solids in liquid milk and milk products using mid and near infrared spectrometry; the determination of protein, fat and moisture in solid or semi solid products, such as milk