NF EN ISO 7971-2

NF EN ISO 7971-2

October 2009
Standard Cancelled

Cereals - Determination of bulk density, called mass per hectolitre - Part 2 : method of traceability for measuring instruments through reference to the international standard instrument

ISO 7971-2:2009 specifies a test method for ensuring the traceability of mass per hectolitre measuring instruments through reference to standard measurement instruments. The mass per hectolitre or bulk density is of commercial importance for grain cereals. Several types of instruments with varying performances exist for measuring it. ISO 7971-2:2009 also specifies the performances required of national standards instruments, secondary standards instruments, and measuring instruments used in laboratories or in collection or storage silos.

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Main informations

Collections

National standards and national normative documents

Publication date

October 2009

Number of pages

25 p.

Reference

NF EN ISO 7971-2

ICS Codes

17.060   Measurement of volume, mass, density, viscosity
67.060   Cereals, pulses and derived products

Classification index

V03-719-2

Print number

1 - 29/10/2009

International kinship

ISO 7971-2:2009

European kinship

EN ISO 7971-2:2009
Sumary
Cereals - Determination of bulk density, called mass per hectolitre - Part 2 : method of traceability for measuring instruments through reference to the international standard instrument

ISO 7971-2:2009 specifies a test method for ensuring the traceability of mass per hectolitre measuring instruments through reference to standard measurement instruments. The mass per hectolitre or bulk density is of commercial importance for grain cereals. Several types of instruments with varying performances exist for measuring it.

ISO 7971-2:2009 also specifies the performances required of national standards instruments, secondary standards instruments, and measuring instruments used in laboratories or in collection or storage silos.

Replaced standards (1)
NF V03-719
September 1996
Standard Cancelled
Cereals. Determination of bulk density, called "mass per hectolitre".

La masse volumique dite "masse à l'hectolitre", également et traditionnellement appelée "poids spécifique", est un critère universellement utilisé dans le commerce des céréales et principalement du blé. Sa détermination, simple et facile à mettre en oeuvre, donne quelques indications sur la teneur en eau et les impuretés des céréales et le rendement en farine dans le cas des blés.

Standard replaced by (1)
NF EN ISO 7971-2
March 2019
Standard Current
Cereals - Determination of bulk density, called mass per hectolitre - Part 2 : method of traceability for measuring instruments through reference to the international standard instrument

<p>This document specifies a test method for ensuring the traceability of bulk density, called "mass per hectolitre", measuring instruments through reference to standard measurement instruments. The mass per hectolitre is of commercial importance for grain cereals. Several types of instruments with varying performances exist for measuring it.</p> <p>This document also specifies the performances required of national standards instruments, secondary standards instruments, and measuring instruments used in laboratories or in collection or storage silos.</p>

Table of contents
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  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Exigences
    2
  • 4.1 Étalon international ou national certifié
    2
  • 4.2 Étalon national
    2
  • 4.3 Étalon secondaire ou étalon interne
    2
  • 4.4 Instrument de mesure de routine
    3
  • 5 Principe
    3
  • 6 Appareillage
    3
  • 7 Mode opératoire
    4
  • 7.1 Raccordement des étalons nationaux à l'étalon international ou national certifié
    4
  • 7.2 Raccordement des étalons secondaires à l'étalon national
    6
  • 7.3 Vérification des instruments en service
    7
  • 8 Suivi des performances de l'instrument
    9
  • 9 Rapports d'essai
    10
  • 9.1 Certificat d'analyse
    10
  • 9.2 Certificat de conformité
    10
  • 10 Identification des instruments de mesure raccordés
    10
  • Annexe A (normative) Méthode de calcul des paramètres de performance des étalons et des instruments de mesure
    11
  • Annexe B (informative) Exemples de détenteurs d'instruments de mesure étalons certifiés
    18
  • Bibliographie
    19
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