prEN ISO 6143

SLOVENSKI STANDARD
01-september-2023
Analiza plinov - Primerjalne metode za določevanje in preverjanje sestave
kalibrirnih plinskih zmesi (ISO/DIS 6143:2023)
Gas analysis - Comparison methods for determining and checking the composition of
calibration gas mixtures (ISO/DIS 6143:2023)
Gasanalyse - Vergleichsverfahren zur Bestimmung und Überprüfung der
Zusammensetzung von Kalibriergasgemischen (ISO/DIS 6143:2023)
Analyse des gaz - Méthodes de comparaison pour la détermination et la vérification de la
composition des mélanges de gaz d’étalonnage (ISO/DIS 6143:2023)
Ta slovenski standard je istoveten z: prEN ISO 6143
ICS:
71.040.40 Kemijska analiza Chemical analysis
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
ISO/DIS 6143
ISO/TC 158 Secretariat: SAC
Voting begins on: Voting terminates on:
2023-07-31 2023-10-23
Gas analysis — Comparison methods for determining and
checking the composition of calibration gas mixtures
Analyse des gaz — Méthodes comparatives pour la détermination et la vérification de la composition des
mélanges de gaz pour étalonnage
ICS: 71.040.40
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
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ISO/DIS 6143:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 6143
ISO/TC 158 Secretariat: SAC
Voting begins on: Voting terminates on:

Gas analysis — Comparison methods for determining and
checking the composition of calibration gas mixtures
Analyse des gaz — Méthodes comparatives pour la détermination et la vérification de la composition des
mélanges de gaz pour étalonnage
ICS: 71.040.40
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 6143:2023(E)
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

ISO/DIS 6143:2023(E)
Contents Page
Foreword .iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.3
5 Principle . 4
6 General procedure .6
6.1 Determination of the analysis function . . 6
6.2 Validation of the analysis function . 9
6.2.1 Purpose . 9
6.2.2 Validation of the response model . 9
6.2.3 Examining compliance with uncertainty requirements . 10
6.2.4 Drift control of the measuring system. 10
6.2.5 Validation of applicability to mismatching calibration gases . 11
6.3 Determination of the composition of a calibration gas mixture .12
6.4 Supplementary instructions . 13
6.4.1 Exceptional uncertainties . 13
6.4.2 Correlation between reference gas mixtures . 14
7 Special procedures .14
7.1 Checking of a pre-assigned composition . 14
7.2 Comparison of several calibration gas mixtures . 15
8 Report of results .15
Annex A (normative) Procedures for data evaluation .16
Annex B (informative) Examples .21
Annex C (informative) Computer implementation of recommended methods .29
Annex D (informative) Additional information on data evaluation .31
Bibliography .38
iii
ISO/DIS 6143:2023(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 158, Analysis of Gases.
This third edition cancels and replaces the second edition (ISO 6143:2001), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— update of definitions, in particular those taken from the VIM
— update of the bibliography and the corresponding references in the text
— update of the information in Annex C on the computer programme B_LEAST; information on
alternative software (Annex D)
— amendment of section 6.2 (now 7.2) “Comparison of several calibration gas mixtures” and related
statements in other parts of the Document
— amendment of the recommendations concerning the number of replicate measurements per sample
— revision of the requirements for the report of results (“Test report”)
— new Annex D (informative) “Additional information on data evaluation”, including a comparison
between the regression method used in ISO 6143 and ordinary least-squares regression, providing
information on relevant documents and software, and dealing with the evaluation of replicate
response measurements
— deletion of section A.1 “Uncertainty specifications for reference gas mixtures” that is no longer
required
— additional references to relevant ISO standards (ISO 12963, ISO 14912, ISO 15796)
— correction of the formula for the power function
iv
ISO/DIS 6143:2023(E)
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.
v
ISO/DIS 6143:2023(E)
Introduction
In gas analysis, calibration of analytical systems is most often confined to the determination of
a straight line through the origin, or of a straight-line segment, using only the minimum number of
calibration standards (one for a straight line through the origin, two for a line segment). This approach
was also adopted in the first edition (1981) of ISO 6143. However, ISO 6143 is devoted to a very special
task: the derivation of calibration gases from appropriate reference gases. Consequently, the multiplier
effect of errors in calibration gases – an error in a calibration gas may cause errors in thousands of
analytical results – implies high demands on the metrological quality of the analysis of calibration
gases. In the development of the second edition (2001) it was therefore decided to use the best available
measurement strategy and data evaluation method. The main changes in the revision of the (1981)
edition related to calibration as well as to uncertainty evaluation:
— including non-linear response curves and/or functions,
— replacing interpolation by regression,
— taking into account the uncertainty on the calibration standards,
— including validation of calculated response curves and/or functions,
— calculating uncertainties by uncertainty propagation.
After twenty years, the principles and procedures specified in the second edition are still fit for purpose.
The current revision therefore mainly concerns additional supporting information.
As a consequence of adopting non-linear response models, advanced regression techniques (errors in
both variables) and uncertainty propagation, the main calculation procedures can only be performed on
a computer, using a specific
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