EN ISO 7971-2:2019

SLOVENSKI STANDARD
01-maj-2019
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SIST EN ISO 7971-2:2010
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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 7971-2:2019)
Getreide - Bestimmung der Schüttdichte, sogenannte Masse je Hektoliter - Teil 2:
Verfahren zur Rückverfolgbarkeit von Messgeräten mittels Referenz auf internationale
Normalgeräte (ISO 7971-2:2019)
Céréales - Détermination de la masse volumique, dite masse à l'hectolitre - Partie 2:
Méthode de raccordement des instruments de mesure à l'étalon international (ISO 7971-
2:2019)
Ta slovenski standard je istoveten z: EN ISO 7971-2:2019
ICS:
67.060 äLWDVWURþQLFHLQSURL]YRGLL] Cereals, pulses and derived
QMLK products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7971-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 67.060 Supersedes EN ISO 7971-2:2009
English Version
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 7971-2:2019)
Céréales - Détermination de la masse volumique, dite Getreide - Bestimmung der Schüttdichte, sogenannte
masse à l'hectolitre - Partie 2: Méthode de Masse je Hektoliter - Teil 2: Verfahren zur
raccordement des instruments de mesure à l'étalon Rückverfolgbarkeit von Messgeräten mittels Referenz
international (ISO 7971-2:2019) auf internationale Normalgeräte (ISO 7971-2:2019)
This European Standard was approved by CEN on 8 February 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7971-2:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7971-2:2019) has been prepared by Technical Committee ISO/TC 34 "Food
products" in collaboration with Technical Committee CEN/TC 338 “Cereal and cereal products” the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2019, and conflicting national standards
shall be withdrawn at the latest by September 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 7971-2:2009.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 7971-2:2019 has been approved by CEN as EN ISO 7971-2:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 7971-2
Third edition
2019-02
Cereals — Determination of bulk
density, called mass per hectolitre —
Part 2:
Method of traceability for measuring
instruments through reference to the
international standard instrument
Céréales — Détermination de la masse volumique, dite masse à
l'hectolitre —
Partie 2: Méthode de raccordement des instruments de mesure à
l'étalon international
Reference number
ISO 7971-2:2019(E)
©
ISO 2019
ISO 7971-2:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 7971-2:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Certified international or national standard instrument . 2
4.2 National standard instrument . 2
4.3 Secondary or internal standard instrument . 2
4.4 Routine measuring instrument . 3
5 Principle . 3
6 Apparatus . 3
7 Procedure. 4
7.1 Traceability of national standard instruments through reference to the certified
international or national standard instrument . 4
7.1.1 General description . 4
7.1.2 Preparation of the test samples . 5
7.1.3 Use of the referenced test samples . 5
7.1.4 Interpretation of the results . 5
7.1.5 Adjustment of the national standard instrument . 6
7.2 Traceability of the secondary standard instruments through reference to the
national standard instrument . 6
7.2.1 General description . 6
7.2.2 Preparation of the test samples . 6
7.2.3 Use of the referenced test samples . 7
7.2.4 Interpretation of the results . 7
7.2.5 Adjustment of the secondary standard instrument . 7
7.3 Verification of instruments in operation . 7
7.3.1 General description . 7
7.3.2 Preparation of the control test samples. 8
7.3.3 Use of the referenced test samples . 8
7.3.4 Interpretation of the results . 8
7.3.5 Adjustment of the instrument . 9
8 Monitoring of instrument performance . 9
9 Test reports .10
9.1 Analysis certificate .10
9.2 Conformity certificate .10
10 Identification of traced measuring instruments .10
Annex A (normative) Method for calculation of performance parameters of standard
instruments and of measurement instruments .11
Annex B (informative) Example — Owners of certified standard measurement instruments .22
Bibliography .23
ISO 7971-2:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approv
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