ISO 23291:2020 PDF

Milk and milk products — Guidelines for the application of in-line and on-line infrared spectrometry

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Title (English):

ISO 23291:2020

Milk and milk products — Guidelines for the application of in-line and on-line infrared spectrometry

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: January 6, 2020
Edition:: ISO IS 23291 edition 1 version 1
ICS:: 67.100.10

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Description (English):

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.

Technical details

Technical committee: ISO/TC 34/SC 5 - Milk and milk products
SKU: ISO 23291:2020

Abstract

Overview

ISO 23291:2020 - “Milk and milk products - Guidelines for the application of in-line and on-line infrared spectrometry” provides guidance for applying infrared (IR) spectrometry in dairy processing for real‑time and near‑real‑time quality control. The standard is focused on in-line and on-line IR systems (distinct from ISO 21543 | IDF 201) and covers use of near infrared (NIR) and mid infrared (MIR) spectrometry to estimate constituents such as protein, fat, total solids and moisture in liquid, semi‑solid and powder dairy matrices.

Key topics and technical requirements

Scope of measurements: Determination of protein, fat and total solids in liquid milk and milk products (MIR and NIR); protein, fat and moisture in powders, butter and semi‑solids using NIR.
Definitions: Clear differentiation of in‑line (probe directly interfaces with the product stream) and on‑line (subsampling via bleed loop or automated sampler) analysis.
Principle & apparatus:
- Measurement modes: transmission, reflectance, attenuated total reflectance (ATR).
- Instrument technologies: dispersive (grating), interferometric (FTIR) or diode‑array devices.
- Spectral ranges as specified: NIR (approx. 400–2 500 nm / indicated cm−1 ranges) and MIR (approx. 4 000–400 cm−1).
- Instruments should include diagnostic tests for photometric noise, wavelength accuracy and precision.
Installation & sampling:
- Protect instruments from cleaning regimes, vibration, dust and temperature extremes.
- Food‑contact material compliance (e.g., Regulation (EC) No 1935/2004 or US 3A) for probes and cells.
- Ensure representative sampling, consistent cleaning, stable interface and correct probe placement.
- Match spectra with reference analyses - sampling in steady‑state and minimal time lag (preferably

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Scope of measurements: Determination of protein, fat and total solids in liquid milk and milk products (MIR and NIR); protein, fat and moisture in powders, butter and semi‑solids using NIR.
Definitions: Clear differentiation of in‑line (probe directly interfaces with the product stream) and on‑line (subsampling via bleed loop or automated sampler) analysis.
Principle & apparatus:
- Measurement modes: transmission, reflectance, attenuated total reflectance (ATR).
- Instrument technologies: dispersive (grating), interferometric (FTIR) or diode‑array devices.
- Spectral ranges as specified: NIR (approx. 400–2 500 nm / indicated cm−1 ranges) and MIR (approx. 4 000–400 cm−1).
- Instruments should include diagnostic tests for photometric noise, wavelength accuracy and precision.
Installation & sampling:
- Protect instruments from cleaning regimes, vibration, dust and temperature extremes.
- Food‑contact material compliance (e.g., Regulation (EC) No 1935/2004 or US 3A) for probes and cells.
- Ensure representative sampling, consistent cleaning, stable interface and correct probe placement.
- Match spectra with reference analyses - sampling in steady‑state and minimal time lag (preferably

ISO 23291:2020 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

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