Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 3: Precision and bias (ISO 6974-3:2018)

This document describes the precision that can be expected from the gas chromatographic method that is set up in accordance with ISO 6974-1. The stated precision provides values for the magnitude of variability that can be expected between test results when the method described in ISO 6974-1 is applied in one or more competent laboratories. This document also gives guidance on the assessment of bias.

Erdgas - Bestimmung der Zusammensetzung und der zugehörigen Unsicherheit durch Gaschromatographie - Teil 3: Präzision und Bias (ISO 6974-3:2018)

Gaz naturel - Détermination de la composition et de l'incertitude associée par chromatographie en phase gazeuse - Partie 3: Fidélité et biais (ISO 6974-3:2018)

Le présent document décrit la fidélité que l'on peut attendre d'une méthode par chromatographie en phase gazeuse, mise en place conformément à l'ISO 6974-1. La fidélité déterminée permet d'évaluer l'étendue de la variabilité envisageable entre les résultats des essais, lorsque la méthode décrite dans l'ISO 6974-1 est appliquée dans un ou plusieurs laboratoires compétents. Le présent document donne également des recommandations quant à l'évaluation du biais.

Zemeljski plin - Določevanje sestave s plinsko kromatografijo in s tem povezana negotovost - 3. del: Natančnost in odstopanje (ISO 6974-3:2018)

Ta dokument opisuje natančnost, ki jo je mogoče pričakovati pri metodi plinske kromatografije, pripravljene v skladu s standardom ISO 6974-1. Navedena natančnost zagotavlja vrednosti za obseg variabilnosti, ki ga je mogoče pričakovati med rezultati preskusa, ko se metoda, opisana v standardu ISO 6974-1, uporablja v enem ali več merodajnih laboratorijih. Ta dokument podaja tudi smernice za ocenjevanje
odstopanja.

General Information

Status
Published
Publication Date
27-Nov-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
28-Nov-2018
Completion Date
28-Nov-2018

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SLOVENSKI STANDARD
SIST EN ISO 6974-3:2019
01-marec-2019
1DGRPHãþD
SIST EN ISO 6974-3:2001
=HPHOMVNLSOLQ'RORþHYDQMHVHVWDYHVSOLQVNRNURPDWRJUDILMRLQVWHPSRYH]DQD
QHJRWRYRVWGHO1DWDQþQRVWLQRGVWRSDQMH ,62
Natural gas - Determination of composition and associated uncertainty by gas
chromatography - Part 3: Precision and bias (ISO 6974-3:2018)
Erdgas - Bestimmung der Zusammensetzung und der zugehörigen Unsicherheit durch
Gaschromatographie - Teil 3: Präzision und Bias (ISO 6974-3:2018)
Gaz naturel - Détermination de la composition et de l'incertitude associée par
chromatographie en phase gazeuse - Partie 3: Fidélité et biais (ISO 6974-3:2018)
Ta slovenski standard je istoveten z: EN ISO 6974-3:2018
ICS:
71.040.50 Fizikalnokemijske analitske Physicochemical methods of
metode analysis
75.060 Zemeljski plin Natural gas
SIST EN ISO 6974-3:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6974-3:2019
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SIST EN ISO 6974-3:2019
EN ISO 6974-3
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2018
EUROPÄISCHE NORM
ICS 75.060 Supersedes EN ISO 6974-3:2001
English Version
Natural gas - Determination of composition and associated
uncertainty by gas chromatography - Part 3: Precision and
bias (ISO 6974-3:2018)

Gaz naturel - Détermination de la composition et de Erdgas - Bestimmung der Zusammensetzung und der

l'incertitude associée par chromatographie en phase zugehörigen Unsicherheit durch Gaschromatographie -

gazeuse - Partie 3: Fidélité et biais (ISO 6974-3:2018) Teil 3: Präzision und Bias (ISO 6974-3:2018)

This European Standard was approved by CEN on 14 November 2018.

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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6974-3:2018 E

worldwide for CEN national Members.
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SIST EN ISO 6974-3:2019
EN ISO 6974-3:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 6974-3:2019
EN ISO 6974-3:2018 (E)
European foreword

This document (EN ISO 6974-3:2018) has been prepared by Technical Committee ISO/TC 193 "Natural

gas" in collaboration with Technical Committee CEN/TC 238 “Test gases, test pressures, appliance

categories and gas appliance types” 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 May 2019, and conflicting national standards shall be

withdrawn at the latest by May 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 6974-3:2001.

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 6974-3:2018 has been approved by CEN as EN ISO 6974-3:2018 without any

modification.
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SIST EN ISO 6974-3:2019
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SIST EN ISO 6974-3:2019
INTERNATIONAL ISO
STANDARD 6974-3
Second edition
2018-10
Natural gas — Determination
of composition and associated
uncertainty by gas chromatography —
Part 3:
Precision and bias
Gaz naturel — Détermination de la composition et de l'incertitude
associée par chromatographie en phase gazeuse —
Partie 3: Fidélité et biais
Reference number
ISO 6974-3:2018(E)
ISO 2018
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SIST EN ISO 6974-3:2019
ISO 6974-3:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 6974-3:2019
ISO 6974-3:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 4

5 Principle ........................................................................................................................................................................................................................ 4

6 Reference precision values ........................................................................................................................................................................ 4

7 Practical applications ...................................................................................................................................................................................... 5

8 Bias ..................................................................................................................................................................................................................................... 6

Annex A (informative) Proficiency scheme data evaluation ........................................................................................................ 7

Bibliography .............................................................................................................................................................................................................................11

© ISO 2018 – All rights reserved iii
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SIST EN ISO 6974-3:2019
ISO 6974-3:2018(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 approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1,

Analysis of natural gas.

This second edition cancels and replaces the first edition (ISO 6974-3:2000), which has been technically

revised.
A list of all parts in the ISO 6974 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 6974-3:2019
INTERNATIONAL STANDARD ISO 6974-3:2018(E)
Natural gas — Determination of composition and
associated uncertainty by gas chromatography —
Part 3:
Precision and bias
1 Scope

This document describes the precision that can be expected from the gas chromatographic method

that is set up in accordance with ISO 6974-1. The stated precision provides values for the magnitude

of variability that can be expected between test results when the method described in ISO 6974-1 is

applied in one or more competent laboratories. This document also gives guidance on the assessment

of bias.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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/IEC 17025, General requirements for the competence of testing and calibration laboratories

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
measurement precision

closeness of agreement between indications or measured quantity values obtained by replicate

measurements on the same or similar objects under specified conditions

Note 1 to entry: Measurement precision is usually expressed numerically by measures of imprecision, such as

standard deviation, variance, or coefficient of variation under the specified conditions of measurement.

Note 2 to entry: The ‘specified conditions’ can be, for example, repeatability conditions of measurement,

intermediate precision conditions of measurement, or reproducibility conditions of measurement (see

ISO 5725-1).

Note 3 to entry: Measurement precision is used to define measurement repeatability, intermediate measurement

precision, and measurement reproducibility.

Note 4 to entry: Sometimes “measurement precision” is erroneously used to mean measurement accuracy.

[SOURCE: JCGM 200:2012, 2.15]
© ISO 2018 – All rights reserved 1
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SIST EN ISO 6974-3:2019
ISO 6974-3:2018(E)
3.2
error of measurement
measured quantity value minus a reference quantity value
Note 1 to entry: The concept of ‘measurement error’ can be used both

a) when there is a single reference quantity value to refer to, which occurs if a calibration is made by means of

a measurement standard with a measured quantity value having a negligible measurement uncertainty or if

a conventional quantity value is given, in which case the measurement error is known, and

b) if a measurand is supposed to be represented by a unique true quantity value of a set of true quantity values

of negligible range in which case the measurement error is not known

Note 2 to entry: Measurement error should not be confused with production error or mistake.

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