EN ISO 14956:2002
(Main)Air quality - Evaluation of the suitability of a measurement procedure by comparison with a required measurement uncertainty (ISO 14956:2002)
Air quality - Evaluation of the suitability of a measurement procedure by comparison with a required measurement uncertainty (ISO 14956:2002)
This International Standard specifies, for the field of air quality measurement procedures, the:
estimation of measurement uncertainty from actual or claimed values of all important performance characteristics of a method under stationary conditions; assessment of whether or not specified values for these performance characteristics comply with the required quality of a measured value at a stated measurand value; evaluation of the applicability of the measurement method based on laboratory performance and confirmatory field test; establishment of requirements on dynamic behaviour of instruments.
This International Standard is applicable to measurement procedures whose output is a defined time average.
Luftbeschaffenheit - Beurteilung der Eignung eines Messverfahrens durch Vergleich mit einer geforderten Messunsicherheit (ISO/FDIS 14956:2002)
Diese Internationale Norm legt Verfahren fest
¾ zur Schätzung der Messunsicherheit aufgrund des Einflusses von tatsächlichen oder vorgegebenen Werten aller wichtigen Verfahrenskenngrößen eines Messverfahrens unter stationären Bedingungen;
¾ zur Bewertung, ob die geforderte Qualität des Messwertes mit den festgelegten Werten dieser Verfahrens-kenngrößen für einen bestimmten Wert der Messgröße eingehalten wird;
¾ zur Überprüfung der Eignung des Messverfahrens aufgrund seiner Leistungsfähigkeit im Labor und deren Bestätigung in Feldtests;
¾ zur Festlegung von Anforderungen an das dynamische Verhalten von Geräten.
Diese Internationale Norm gilt für Messverfahren, deren Messsignal ein festgelegter zeitlicher Mittelwert ist.
Qualité de l'air - Evaluation de l'aptitude à l'emploi d'une procédure de mesurage par comparaison avec une incertitude de mesure requise (ISO 14956:2002)
La présente Norme internationale spécifie, en ce qui concerne le domaine du mesurage de la qualité de l'air, les procédures pour estimer l'incertitude de mesure à partir des valeurs réelles ou déclarées de toutes les caractéristiques métrologiques importantes d'une méthode dans des conditions stables; évaluer si des valeurs spécifiées pour ces caractéristiques métrologiques sont conformes ou non à la qualité requise d'une valeur mesurée pour une valeur spécifiée du mesurande; évaluer l'applicabilité de la méthode de mesurage à partir de la performance en laboratoire et de l'essai de confirmation sur le terrain; établir les exigences en matière de comportement dynamique des instruments.
La présente Norme internationale s'applique aux méthodes de mesurage dont le résultat est une moyenne couvrant une période de temps donnée.
Kakovost zraka - Vrednotenje primernosti merilnega postopka s primerjavo z zahtevano merilno negotovostjo (ISO 14956:2002)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2003
Kakovost zraka - Vrednotenje primernosti merilnega postopka s primerjavo z
zahtevano merilno negotovostjo (ISO 14956:2002)
Air quality - Evaluation of the suitability of a measurement procedure by comparison with
a required measurement uncertainty (ISO 14956:2002)
Luftbeschaffenheit - Beurteilung der Eignung eines Messverfahrens durch Vergleich mit
einer geforderten Messunsicherheit (ISO 14956:2002)
Qualité de l'air - Evaluation de l'aptitude a l'emploi d'une procédure de mesurage par
comparaison avec une incertitude de mesure requise (ISO 14956:2002)
Ta slovenski standard je istoveten z: EN ISO 14956:2002
ICS:
13.040.01 Kakovost zraka na splošno Air quality in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 14956
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2002
ICS 13.040.01
English version
Air quality - Evaluation of the suitability of a measurement
procedure by comparison with a required measurement
uncertainty (ISO 14956:2002)
Qualité de l'air - Evaluation de l'aptitude à l'emploi d'une Luftbeschaffenheit - Beurteilung der Eignung eines
procédure de mesurage par comparaison avec une Messverfahrens durch Vergleich mit einer geforderten
incertitude de mesure requise (ISO 14956:2002) Messunsicherheit (ISO 14956:2002)
This European Standard was approved by CEN on 28 July 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14956:2002 E
worldwide for CEN national Members.
CORRECTED 2002-10-02
Foreword
This document (EN ISO 14956:2002) has been prepared by Technical Committee ISO /TC
146 "Air quality" in collaboration with Technical Committee CEN/TC 264 "Air quality", the
secretariat of which is held by DIN.
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 2003, and conflicting national
standards shall be withdrawn at the latest by February 2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
United Kingdom.
Endorsement notice
The text of ISO 14956:2002 has been approved by CEN as EN ISO 14956:2002 without any
modifications.
INTERNATIONAL ISO
STANDARD 14956
First edition
2002-08-15
Air quality — Evaluation of the suitability of
a measurement procedure by comparison
with a required measurement uncertainty
Qualité de l'air — Évaluation de l'aptitude à l'emploi d'une procédure de
mesurage par comparaison avec une incertitude de mesure requise
Reference number
ISO 14956:2002(E)
©
ISO 2002
ISO 14956:2002(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2002
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2002 – All rights reserved
ISO 14956:2002(E)
Contents Page
Foreword . iv
Introduction. v
1 Scope. 1
2 Normative reference. 1
3 Terms and definitions. 1
4 Symbols and abbreviated terms. 2
5 Principle . 4
6 Requirements . 7
6.1 Methods and materials . 7
6.2 Performance characteristics. 7
6.3 Required measurement quality. 7
7 Required performance related to dynamic conditions.7
7.1 General . 7
7.2 Response time. 7
8 Required performance related to stationary conditions.8
8.1 Analytical function, model function and variance function. 8
8.2 Identification of sources of uncertainty. 9
8.3 Assignment of sources of uncertainty to performance characteristics. 9
8.4 Definition and quantification of conditions of operation of the measurement system . 10
8.5 Quantification of the impact of selected performance characteristics as partial standard
uncertainties . 11
8.6 Estimation of the combined standard uncertainty . 14
8.7 Estimation of the expanded uncertainty. 14
8.8 Evaluation of compliance with the required measurement quality . 14
9 Field verification. 14
10 Report. 15
Annex A (informative) Default ranges of chemical interferents. 16
Annex B (normative) Coverage factors derived from effective degrees of freedom. 18
Annex C (informative) Example of an assessment of compliance of UV fluorescence method for SO
with requirements on ambient air quality. 19
Annex D (informative) Examples of field verification programmes. 24
Bibliography. 26
ISO 14956:2002(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14956 was prepared by Technical Committee ISO/TC 146, Air quality, Subcommittee SC 4, General aspects.
Annex B forms a normative part of this International Standard. Annexes A, C and D are for information only.
iv © ISO 2002 – All rights reserved
ISO 14956:2002(E)
Introduction
A measuring task generally includes information on the required quality of the measurement result, which may be
quantified by the measurement uncertainty. The required quality may be specified, e.g. by legislation, by authorities
or the parties involved.
The quality of a measurement result strongly depends on the performance of the measuring method used. This
International Standard specifies the procedures to determine the measurement uncertainty of an individual
measurement result, using relevant performance characteristics of the measuring method, and to verify compliance
with the requirements of the measuring task.
A procedure for establishing the uncertainty of the time average of a series of single measurements will be given in
a separate International Standard [3].
INTERNATIONAL STANDARD ISO 14956:2002(E)
Air quality — Evaluation of the suitability of a measurement
procedure by comparison with a required measurement
uncertainty
1 Scope
This International Standard specifies, for the field of air quality measurement procedures, the:
estimation of measurement uncertainty from actual or claimed values of all important performance
characteristics of a method under stationary conditions;
assessment of whether or not specified values for these performance characteristics comply with the required
quality of a measured value at a stated measurand value;
evaluation of the applicability of the measurement method based on laboratory performance and confirmatory
field test;
establishment of requirements on dynamic behaviour of instruments.
This International Standard is applicable to measurement procedures whose output is a defined time average.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent edition of the normative document indicated below. For
undated references, the l
...
SLOVENSKI STANDARD
01-marec-2003
Kakovost zraka - Vrednotenje primernosti merilnega postopka s primerjavo z
zahtevano merilno negotovostjo (ISO 14956:2002)
Air quality - Evaluation of the suitability of a measurement procedure by comparison with
a required measurement uncertainty (ISO 14956:2002)
Luftbeschaffenheit - Beurteilung der Eignung eines Messverfahrens durch Vergleich mit
einer geforderten Messunsicherheit (ISO 14956:2002)
Qualité de l'air - Evaluation de l'aptitude a l'emploi d'une procédure de mesurage par
comparaison avec une incertitude de mesure requise (ISO 14956:2002)
Ta slovenski standard je istoveten z: EN ISO 14956:2002
ICS:
13.040.01 Kakovost zraka na splošno Air quality in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 14956
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2002
ICS 13.040.01
English version
Air quality - Evaluation of the suitability of a measurement
procedure by comparison with a required measurement
uncertainty (ISO 14956:2002)
Qualité de l'air - Evaluation de l'aptitude à l'emploi d'une Luftbeschaffenheit - Beurteilung der Eignung eines
procédure de mesurage par comparaison avec une Messverfahrens durch Vergleich mit einer geforderten
incertitude de mesure requise (ISO 14956:2002) Messunsicherheit (ISO 14956:2002)
This European Standard was approved by CEN on 28 July 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14956:2002 E
worldwide for CEN national Members.
CORRECTED 2002-10-02
Foreword
This document (EN ISO 14956:2002) has been prepared by Technical Committee ISO /TC
146 "Air quality" in collaboration with Technical Committee CEN/TC 264 "Air quality", the
secretariat of which is held by DIN.
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 2003, and conflicting national
standards shall be withdrawn at the latest by February 2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
United Kingdom.
Endorsement notice
The text of ISO 14956:2002 has been approved by CEN as EN ISO 14956:2002 without any
modifications.
INTERNATIONAL ISO
STANDARD 14956
First edition
2002-08-15
Air quality — Evaluation of the suitability of
a measurement procedure by comparison
with a required measurement uncertainty
Qualité de l'air — Évaluation de l'aptitude à l'emploi d'une procédure de
mesurage par comparaison avec une incertitude de mesure requise
Reference number
ISO 14956:2002(E)
©
ISO 2002
ISO 14956:2002(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2002
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2002 – All rights reserved
ISO 14956:2002(E)
Contents Page
Foreword . iv
Introduction. v
1 Scope. 1
2 Normative reference. 1
3 Terms and definitions. 1
4 Symbols and abbreviated terms. 2
5 Principle . 4
6 Requirements . 7
6.1 Methods and materials . 7
6.2 Performance characteristics. 7
6.3 Required measurement quality. 7
7 Required performance related to dynamic conditions.7
7.1 General . 7
7.2 Response time. 7
8 Required performance related to stationary conditions.8
8.1 Analytical function, model function and variance function. 8
8.2 Identification of sources of uncertainty. 9
8.3 Assignment of sources of uncertainty to performance characteristics. 9
8.4 Definition and quantification of conditions of operation of the measurement system . 10
8.5 Quantification of the impact of selected performance characteristics as partial standard
uncertainties . 11
8.6 Estimation of the combined standard uncertainty . 14
8.7 Estimation of the expanded uncertainty. 14
8.8 Evaluation of compliance with the required measurement quality . 14
9 Field verification. 14
10 Report. 15
Annex A (informative) Default ranges of chemical interferents. 16
Annex B (normative) Coverage factors derived from effective degrees of freedom. 18
Annex C (informative) Example of an assessment of compliance of UV fluorescence method for SO
with requirements on ambient air quality. 19
Annex D (informative) Examples of field verification programmes. 24
Bibliography. 26
ISO 14956:2002(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14956 was prepared by Technical Committee ISO/TC 146, Air quality, Subcommittee SC 4, General aspects.
Annex B forms a normative part of this International Standard. Annexes A, C and D are for information only.
iv © ISO 2002 – All rights reserved
ISO 14956:2002(E)
Introduction
A measuring task generally includes information on the required quality of the measurement result, which may be
quantified by the measurement uncertainty. The required quality may be specified, e.g. by legislation, by authorities
or the parties involved.
The quality of a measurement result strongly depends on the performance of the measuring method used. This
International Standard specifies the procedures to determine the measurement uncertainty of an individual
measurement result, using relevant performance characteristics of the measuring method, and to verify compliance
with the requirements of the measuring task.
A procedure for establishing the uncertainty of the time average of a series of single measurements will be given in
a separate International Standard [3].
INTERNATIONAL STANDARD ISO 14956:2002(E)
Air quality — Evaluation of the suitability of a measurement
procedure by comparison with a required measurement
uncertainty
1 Scope
This International Standard specifies, for the field of air quality measurement procedures, the:
estimation of measurement uncertainty from actual or claimed values of all important performance
characteristics of a method under stationary conditions;
assessment of whether or not specified values for these performance characteristics comply with the required
quality of a measured value at a stated measurand value;
evaluation of the applicability of the measurement method based on laboratory performance and confirmatory
field test;
establishment of requirements on dynamic behaviour of instruments.
This International Standard is applicable to measurement procedures whose output is a defined time average.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent edition of the normative document indicated below. For
undated references, the latest edition of th
...
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