EN ISO 7971-3:2009
(Main)Cereals - Determination of bulk density, called mass per hectolitre - Part 3: Routine method (ISO 7971-3:2009)
Cereals - Determination of bulk density, called mass per hectolitre - Part 3: Routine method (ISO 7971-3:2009)
ISO 7971-3:2009 specifies a routine method for the determination of bulk density, called “mass per hectolitre” of cereals as grain using manual or automatic, mechanical, electric or electronic mass per hectolitre measuring instruments.
Getreide - Bestimmung der Schüttdichte, sogenannte Masse je Hektoliter - Teil 3: Routineverfahren (ISO 7971-3:2009)
Dieser Teil von ISO 7971 legt ein Routineverfahren zur Bestimmung der Schüttdichte, der sogenannten
„Masse je Hektoliter“ von Getreidesorten mit einem manuellen oder automatischen, mechanischen, elektrischen
oder elektronischen „Masse je Hektoliter“-Messgerät fest, wobei das Fassungsvermögen des Messbehälters
mindestens 750 ml beträgt, unter Berücksichtigung eines systematischen Fehlers und/oder einer
Neigungskorrektur.
ANMERKUNG Weitere Details von Messinstrumenten werden in ISO 7971-2:2009, 6.3 festgelegt.
Céréales - Détermination de la masse volumique, dite masse à l'hectolitre - Partie 3: Méthode pratique (ISO 7971-3:2009)
L'ISO 7971-3:2009 spécifie une méthode pratique pour la détermination de la masse volumique dite «masse à l'hectolitre» des céréales en grains à l'aide d'un instrument de mesure de la masse à l'hectolitre à fonctionnement manuel ou automatique, mécanique, électrique ou électronique.
Žito - Določanje prostorninske mase, imenovane hektolitrska masa - 3. del: Rutinska metoda (ISO 7971-3:2009)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2009
äLWR'RORþDQMHSURVWRUQLQVNHPDVHLPHQRYDQHKHNWROLWUVNDPDVDGHO
5XWLQVNDPHWRGD ,62
Cereals - Determination of bulk density, called mass per hectolitre - Part 3: Routine
method (ISO 7971-3:2009)
Getreide - Bestimmung der Schüttdichte, sogenannte Masse je Hektoliter - Teil 3:
Routineverfahren (ISO 7971-3:2009)
Céréales - Détermination de la masse volumique, dite masse à l'hectolitre - Partie 3:
Méthode pratique (ISO 7971-3:2009)
Ta slovenski standard je istoveten z: EN ISO 7971-3:2009
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.
EUROPEAN STANDARD
EN ISO 7971-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2009
ICS 67.060
English Version
Cereals - Determination of bulk density, called mass per
hectolitre - Part 3: Routine method (ISO 7971-3:2009)
Céréales - Détermination de la masse volumique, dite Getreide - Bestimmung der Schüttdichte, sogenannte
masse à l'hectolitre - Partie 3: Méthode pratique (ISO 7971- Masse je Hektoliter - Teil 3: Routineverfahren (ISO 7971-
3:2009) 3:2009)
This European Standard was approved by CEN on 8 August 2009.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7971-3:2009: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
This document (EN ISO 7971-3:2009) has been prepared by Technical Committee CEN/TC 338 “Cereal and
cereal products”, the secretariat of which is held by AFNOR, in collaboration with Technical Committee
ISO/TC 34 "Food products".
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 February 2010, and conflicting national standards shall be withdrawn
at the latest by February 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
INTERNATIONAL ISO
STANDARD 7971-3
First edition
2009-08-15
Cereals — Determination of bulk density,
called mass per hectolitre —
Part 3:
Routine method
Céréales — Détermination de la masse volumique, dite masse
à l'hectolitre —
Partie 3: Méthode pratique
Reference number
ISO 7971-3:2009(E)
©
ISO 2009
ISO 7971-3:2009(E)
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ii © ISO 2009 – All rights reserved
ISO 7971-3:2009(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 1
5 Apparatus . 2
6 Procedure . 2
6.1 General. 2
6.2 Hand-operated instruments. 2
6.3 Automatic instruments. 3
6.4 Expression of results . 3
7 Precision. 3
7.1 Interlaboratory test . 3
7.2 Repeatability. 3
7.3 Reproducibility. 3
7.4 Comparison of two groups of measurements in one laboratory. 4
7.5 Comparison of two groups of measurements in two laboratories. 4
7.6 Uncertainty . 4
8 Test report . 5
Annex A (informative) Description of dimensions and use of KERN apparatus . 6
Annex B (informative) Description of dimensions and use of NILEMA LITRE apparatus . 10
Annex C (informative) Results of interlaboratory tests. 12
Bibliography . 14
ISO 7971-3:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 7971 (all parts) was prepared by the European Committee for Standardization (CEN) Technical
Committee CEN/TC 338, Cereal and cereal products, in collaboration with Technical Committee ISO/TC 34,
Food products, Subcommittee SC 4, Cereals and pulses, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
The first edition of ISO 7971-3 cancels and replaces the first edition of ISO 7971-2:1995, which has been
technically revised.
ISO 7971 consists of the following parts, under the general title Cereals — Determination of bulk density,
called mass per hectolitre:
⎯ Part 1: Reference method
⎯ Part 2: Method of traceability for measuring instruments through reference to the international standard
instrument
⎯ Part 3: Routine method
iv © ISO 2009 – All rights reserved
INTERNATIONAL STANDARD ISO 7971-3:2009(E)
Cereals — Determination of bulk density, called mass
per hectolitre —
Part 3:
Routine method
1 Scope
This part of ISO 7971 specifies a routine method for the determination of bulk density, called “mass per
hectolitre” of cereals as grain using manual or automatic, mechanical, electric or electronic mass per hectolitre
measuring instruments.
NOTE Further details of the measuring instruments are specified in ISO 7971-2:2009, 6.4.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 7971-2, Cereals — Determination of bulk density, called mass per hectolitre — Part 2: Method of
traceability for measuring instruments through reference to the international standard instrument
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bulk density
“mass per hectolitre”
〈cereals〉 ratio of the mass of a cereal to the volume it occupies after being poured into a container under well-
defined conditions
NOTE 1 Bulk density is expressed in kilograms per hectolitre of grains as received.
NOTE 2 The bulk density, as defined in this part of ISO 7971, is different from “packing density” or “intrinsic density” of
cereals.
[ISO 7971-1:2009]
4 Principle
The mass per hectolitre of a cereal is obtained from the mass of a volume of cereal determined under
controlled sample filling and flow conditions.
ISO 7971-3:2009(E)
The mass per hectolitre can be affected by:
a) space between the grains, which depends on the grain size and shape;
b) density of the grains.
5 Apparatus
5.1 General requirement for bulk density apparatus. Any apparatus (5.2 and 5.3) shall be verified
according to ISO 7971-2 and shall fulfil the performance demands specified therein.
5.2 Hand-operated measuring instrument. Apparatus consisting of a filling hopper, a measuring
container and the accessories necessary for their use.
The manner in which the grain is poured into the measuring container and the way in which it packs into the
container can cause the measurements taken by the various instruments to vary and lead to measurement
errors.
To minimize such variations, special attention should be given to ensuring that the desi
...
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