ISO 23291:2020 pdf download

ISO 23291:2020 pdf download.Milk and milk products — Guidelines for the application of in-line and on-line infrared spectrometry
1 Scope
This 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 powder,and butter and liquid dairy streams using near infrared spectrometry.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 in-line analysis
analysis of a product line where the sensor probe interfaces directly with the product stream being measured, or a reflectance measurement through an optical window into the product stream
3.2 on-line analysis
analysis of a product line where the sensor probe interfaces indirectly with the product stream being measured by way of a bleed loop, automated grab sampler or other means of subsampling
3.3 at-line analysis
analysis of a product where the instrument is physically remote to the product stream being measured and the sample is manually introduced to the instrument
Note 1 to entry: While not covered in this document, this definition is added here in order to distinguish this type of spectometric analysis from in- and on-line apparatus.
3.4 near infrared instrument
NIR instrument
proprietary apparatus utilizing wavelengths within the range 400 nm to 2 500 nm or 25 000 cm −1 to 4 000 cm −1 (both visible and NIR range) or 12 820 cm −1 to 4 000 cm −1 (NIR range only) which, when used under certain conditions, estimates mass fractions or other parameters of use
5 Apparatus
5.1 Infrared instrument, based on diffuse reflectance or transmittance measurement in the near (400 nm to 2 500 nm or 25 000 cm −1 to 4 000 cm −1 or 12 820 cm −1 to 4 000 cm −1 ) or mid (4 000 cm −1 to 400 cm −1 ) wavelength region or segments of this or at discrete wavelengths. The optical operation principle may be dispersive (e.g. grating monochromators), interferometric or diode-array based. The instrument should be provided with an appropriate diagnostic test system for testing photometric instrument noise, wavelength accuracy and wavelength precision (for scanning spectrophotometers). The instrument shall be able to optically view into the product stream with an appropriate interface. There are many commercial such devices with a wide variety of technology depending on specific applications.