EN 14625:2024
(Main)Ambient air - Standard method for the measurement of the concentration of ozone by ultraviolet photometry
Ambient air - Standard method for the measurement of the concentration of ozone by ultraviolet photometry
This European Standard specifies a continuous measurement method for the determination of the concentrations of ozone present in ambient air based on the ultraviolet photometric measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate ultraviolet photometric analyser by means of type approval tests. It also includes the evaluation of the suitability of an analyser for use in a specific fixed site so as to meet the data quality requirements as specified in Annex I of Directive 2008/50/EC [1] and requirements during sampling, calibration and quality assurance for use.
The method is applicable to the determination of the concentration of ozone present in ambient air up to 500 μg/m3.
This concentration range represents the certification range for ozone for the type approval test.
NOTE 1 Other ranges may be used for measurement systems applied at rural locations monitoring ecosystems.
NOTE 2 When the standard is used for other purposes than Directive 2008/50/EC, the ranges and uncertainty requirements may not apply.
The method covers the determination of ambient air concentrations of ozone in zones classified as rural areas, urban and urban-background areas.
The results are expressed in μg/m3 (at 20 °C and 101,3 kPa).
NOTE 3 500 μg/m3 of O3 corresponds to 250 nmol/mol of O3 at 20 °C and 101,3 kPa.
This standard contains information for different groups of users.
Clauses 5 to 7 and Annexes B and C contain general information about the principles of ozone measurement by ultraviolet photometric analyser and sampling equipment.
Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of ozone analysers. These sections contain information about:
− type-approval test conditions, test procedures and test requirements;
− analyser performance requirements;
− evaluation of the type-approval test results;
− evaluation of the uncertainty of the measurement results of the ozone analyser based on the type-approval test results.
Clauses 9 to 11 and Annexes F and G are directed towards monitoring networks performing the practical
measurements of ozone in ambient air. These sections contain information about:
− initial installation of the analyser in the monitoring network and acceptance testing;
− ongoing quality assurance/quality control;
− calculation and reporting of measurement results;
− evaluation of the uncertainty of measurement results under practical monitoring conditions.
Außenluft - Messverfahren zur Bestimmung von Ozon in Luft mit dem UV-Verfahren
Dieses Dokument legt ein kontinuierliches Messverfahren zur Bestimmung der Konzentration von Ozon in Umgebungsluft auf der Grundlage des Ultraviolettphotometrie-Messprinzips fest. Dieses Dokument beschreibt die Leistungskenngrößen und legt die relevanten Mindestkriterien für die Auswahl eines geeigneten UV photometrischen Messgeräts durch Eignungsprüfung fest. Es beinhaltet auch die Bewertung der Eignung eines Messgeräts für den Einsatz an einem bestimmten ortsfesten Messstandort bezüglich der Anforderungen an die Datenqualität (siehe Anhang I der Richtlinie 2008/50/EG [1] für weitere Informationen) und bezüglich der Anforderungen für Probennahme, Kalibrierung und Qualitätssicherung.
Das Verfahren ist anwendbar zur Bestimmung der Konzentration von Ozon in Umgebungsluft bis 500 µg/m3. Dieser Konzentrationsbereich entspricht dem Zertifizierungsbereich für Ozon für die Eignungsprüfung.
ANMERKUNG 1 Andere Bereiche dürfen für an ländlichen Überwachungsstandorten eingesetzten Messsystemen verwendet werden.
ANMERKUNG 2 Wenn dieses Dokument für andere Zwecke als nach Richtlinie 2008/50/EG eingesetzt, gelten die Anforderungen hinsichtlich Anwendungsbereich und Unsicherheit möglicherweise nicht.
Das Verfahren umfasst die Bestimmung von Ozon-Konzentrationen in der Außenluft an Standorten, die als ländlicher, städtischer und städtischer Hintergrund klassifiziert sind.
Die Ergebnisse werden in µg/m3 (bei 20 °C und 101,3 kPa) angegeben.
ANMERKUNG 3 500 µg/m3 O3 entspricht 250 nmol/mol O3 bei 20 °C und 101,3 kPa.
Dieses Dokument enthält Informationen für verschiedene Nutzergruppen.
Abschnitt 5 bis Abschnitt 7 und Anhang B und Anhang C enthalten allgemeine Informationen über die Grundlagen der Ozon-Messung mit einem Ultraviolett Photometer sowie über die Probennahmeeinrichtung.
Abschnitt 8 und Anhang E richten sich speziell an Prüfinstitute und -laboratorien, die Eignungsprüfungen von Ozon-Messgeräten durchführen. Diese Abschnitte enthalten Informationen über:
- Prüfbedingungen, -verfahren und -anforderungen bei der Eignungsprüfung;
- Anforderungen an die Leistungsfähigkeit des Messgeräts;
- die Bewertung der Ergebnisse der Eignungsprüfung;
- die Bewertung der verbundenen Unsicherheit der Messungen mit dem Ozon-Messgerät anhand der Ergebnisse der Eignungsprüfung.
Abschnitt 9 bis Abschnitt 11 und Anhang F und Anhang G richten sich an die Betreiber von Messnetzen, mit denen Ozon-Messungen in Umgebungsluft durchgeführt werden. Diese Abschnitte enthalten Informationen über:
- die Erstinstallation des Messgeräts im Messnetz und Eignungsbewertung;
- die laufende Qualitätssicherung und -kontrolle;
- die Berechnung und Übermittlung der Messergebnisse;
- die Bewertung der Unsicherheit der Messergebnisse unter Messbedingungen.
Dieses Dokument stellt eine Weiterentwicklung der vorangegangenen Ausgaben (EN 14625:2005 und EN 14625:2012) dar.
ANMERKUNG 4 Messgeräte, die vor der Veröffentlichung dieses Dokuments einer Eignungsprüfung unterzogen wurden, können weiterhin für regulatorische Überwachungen verwendet werden. Sobald neuere Versionen der im Rahmen dieses Dokuments geprüften Messgeräte verfügbar sind, muss die Verwendung der alten Referenz Messgeräte eingestellt werden
Air ambiant - Méthode normalisée de mesurage de la concentration en ozone par photométrie U.V.
Le présent document spécifie une méthode de mesurage en continu pour la détermination de la concentration en ozone dans l'air ambiant, selon le principe de mesure par photométrie U.V. Le présent document décrit les caractéristiques de performance et fixe les critères minimaux requis pour sélectionner un analyseur par photométrie U.V. à l'aide de l’essai de type. Il présente également l'évaluation de l'aptitude à l'emploi d'un analyseur sur un site fixe spécifique afin de répondre aux exigences de qualité des données (voir l'Annexe I de la Directive 2008/50/CE [1] pour des informations supplémentaires) ainsi qu'aux exigences à observer au cours du prélèvement, de l'étalonnage et de l'assurance qualité.
La méthode s'applique à la détermination de la concentration en ozone présent dans l'air ambiant jusqu'à 500 µg/m3. Cette plage de concentration représente l'étendue de mesure certifiée en ozone pour l’essai de type.
NOTE 1 D'autres plages peuvent être utilisées pour les systèmes de mesure appliqués aux zones rurales contrôlant des écosystèmes.
NOTE 2 Lorsque le présent document est utilisé à d'autres fins que la Directive 2008/50/CE, les exigences relatives aux plages et à l'incertitude peuvent ne pas être appliquées.
La méthode s'applique à la détermination des concentrations en ozone présent dans l'air ambiant dans les zones classées comme zones rurales, urbaines et périurbaines.
Les résultats sont exprimés en µg/m3 (à 20 °C et 101,3 kPa).
NOTE 3 500 µg/m3 d'O3 correspondent à 250 nmol/mol d'O3 à 20 C et 101,3 kPa.
Le présent document contient des informations pour différents groupes d'utilisateurs.
Les Articles 5 à 7 et les Annexes B et C contiennent des informations générales relatives aux principes de mesure de l'ozone à l'aide d'un analyseur par photométrie U.V. et d'un équipement de prélèvement.
L'Article 8 et l'Annexe E concernent tout particulièrement les organismes et les laboratoires d'essai qui effectuent l’essai de type des analyseurs d'ozone. Ces sections contiennent des informations concernant :
- les conditions de l’essai de type, les procédures de test et les exigences d'essai ;
- les exigences de performance de l'analyseur ;
- l'évaluation des résultats de l’essai de type ;
- l'évaluation de l'incertitude associée au mesurage effectué par l'analyseur d'ozone d'après les résultats de l’essai de type.
Les Articles 9 à 11 et les Annexes F et G concernent les réseaux de surveillance effectuant les mesurages concrets de l'ozone dans l'air ambiant. Ces sections contiennent des informations concernant :
- l'installation initiale de l'analyseur dans le réseau de surveillance et l'essai de réception ;
- l'assurance qualité/le contrôle qualité en continu ;
- le calcul et le compte-rendu des résultats de mesure ;
- l'évaluation de l'incertitude des résultats de mesurage sous des conditions de surveillance réelles.
Le présent document représente une évolution par rapport aux éditions antérieures (EN 14625:2005 et EN 14625:2012).
NOTE 4 Les analyseurs soumis à essai de type avant la publication du présent document peuvent toujours être utilisés à des fins de surveillance réglementaire. Au fur et à mesure que de nouvelles versions des analyseurs testés dans le cadre du présent document sont disponibles, cesser d'utiliser les anciens analyseurs de référence.
Zunanji zrak - Standardna metoda za določanje koncentracije ozona z ultravijolično fotometrijo
Ta dokument določa metodo stalnega merjenja za določitev koncentracij ozona v zunanjem zraku na podlagi ultravijoličnega fotometričnega merilnega principa. Ta dokument opisuje lastnosti delovanja in vzpostavlja ustrezna minimalna merila, potrebna za izbiro ustreznega ultravijoličnega fotometričnega analizatorja s tipskimi preskusi. Vključuje tudi oceno ustreznosti analizatorja za uporabo na specifičnem fiksnem mestu, da se izpolnijo zahteve o kakovosti podatkov (za več informacij glej dodatek I Direktive 2008/50/ES [1]) ter zahteve med vzorčenjem, kalibriranjem in zagotavljanjem kakovosti za uporabo.
Metoda se uporablja za določitev koncentracije ozona v zunanjem zraku do vrednosti 500 μg/m3. Te koncentracije predstavljajo razpon certificiranja za ozon za tipske preskuse. OPOMBA 1: Za merilne sisteme za spremljanje ekosistemov v podeželskem okolju se lahko uporabljajo tudi druge koncentracije.
OPOMBA 2: Če se ta dokument uporablja za druge namene in ne za namene Direktive 2008/50/ES, zahteve glede razponov in negotovosti morda ne veljajo.
Ta metoda zajema določitev koncentracij ozona v zunanjem zraku na področjih, ki so uvrščena med podeželska območja, mestna območja in območja v urbanem okolju.
Rezultati so izraženi v μg/m3 (pri 20 °C in 101,3 kPa).
OPOMBA 3: 500 µg/m3 ozona (O3) ustreza 250 nmol/mol ozona pri 20 °C in 101,3 kPa.
Ta dokument vsebuje informacije za različne skupine uporabnikov.
Točke od 5 do 7 ter dodatka B in C vsebujejo splošne informacije o načelih merjenja ozona z ultravijoličnimi fotometričnimi analizatorji in opremo za vzorčenje.
Osrednji predmet obravnave v točki 8 in dodatku E so laboratoriji, ki izvajajo tipske preskuse analizatorjev ozona. Ti razdelki vsebujejo informacije o:
– pogojih tipskih preskusov ter preskusnih postopkih in zahtevah;
– zahtevah glede učinkovitosti analizatorja;
– ocenah rezultatov tipskih preskusov;
– oceni povezane negotovosti meritev analizatorja ozona na podlagi rezultatov tipskih preskusov.
Osrednji predmet obravnave v točkah od 9 do 11 ter dodatkih F in G so mreže za spremljanje, ki izvajajo praktične meritve ozona v zunanjem zraku. Ti razdelki vsebujejo informacije o:
– začetni namestitvi analizatorja v mreži za spremljanje in preskušanju sprejemljivosti;
– stalnem zagotavljanju oziroma nadzoru kakovosti;
– izračunavanju in sporočanju rezultatov merjenja;
– oceni negotovosti rezultatov merjenja v okviru pogojev praktičnega spremljanja.
Ta dokument je nadgradnja prejšnjih različic (EN 14625:2005 in EN 14625:2012).
OPOMBA 4: Analizatorje, ki so bili tipsko preskušeni pred objavo tega dokumenta, je mogoče še vedno uporabljati za regulirano spremljanje. S pojavom novejših različic analizatorjev, preskušenih v skladu s tem dokumentom, se uporaba starejših referenčnih analizatorjev preneha.
General Information
- Status
- Published
- Publication Date
- 17-Dec-2024
- Technical Committee
- CEN/TC 264 - Air quality
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 18-Dec-2024
- Due Date
- 18-Dec-2023
- Completion Date
- 18-Dec-2024
Relations
- Effective Date
- 19-Jan-2023
Overview
EN 14625:2024 (CEN) - Ambient air: Standard method for the measurement of the concentration of ozone by ultraviolet photometry - defines a continuous, fixed‑site method to measure ozone in ambient air using ultraviolet (UV) photometric analysers. The standard prescribes performance characteristics, minimum type‑approval criteria and procedures for laboratory and field testing. It covers concentrations up to 500 μg/m3 (expressed at 20 °C and 101,3 kPa) and addresses requirements for sampling, calibration, quality assurance and uncertainty evaluation in line with Annex I of Directive 2008/50/EC.
Key topics and technical requirements
- Measuring principle: Continuous UV absorption photometry for ozone detection.
- Type‑approval testing: Laboratory and field test procedures, performance criteria and evaluation methods for analyser certification.
- Performance characteristics: Response time, short‑term drift, repeatability, linearity (lack of fit), sensitivity to pressure/temperature/voltage, interferents, averaging and residence time.
- Sampling system: Construction, particle filtration, sample flow control, pump and manifold testing to minimise ozone loss.
- Calibration & QA/QC: Traceable zero/span procedures, calibration gas specifications, frequency of checks, data adjustment functions and treatment of out‑of‑spec data.
- Uncertainty assessment: Methods to derive measurement uncertainty from type‑approval and field test results.
- Scope of application: Suitable for rural, urban and urban‑background monitoring stations; notes on alternative ranges for ecosystem monitoring.
- Documentation: Test reports, suitability evaluation, installation and ongoing operational records.
Practical applications and users
Who uses EN 14625:2024:
- Environmental monitoring networks (local, national) for regulatory ozone monitoring and reporting.
- Test houses and calibration laboratories performing type approval and performance validation of ozone analysers.
- Manufacturers of UV photometric ozone analysers for design verification and certification.
- Air quality regulators and consultants implementing Directive 2008/50/EC compliance and data quality systems.
- Research groups and ecosystem monitoring schemes (with adjusted concentration ranges as noted).
Practical uses:
- Selecting and type‑approving ozone analysers for fixed‑site monitoring.
- Designing sampling manifolds and routine QA/QC programs.
- Calculating and reporting validated ozone concentrations and measurement uncertainty for compliance and public reporting.
Related standards and notes
- Supersedes EN 14625:2012.
- Directly referenced for compliance with Directive 2008/50/EC (Annex I).
- Applicable concentration certification range: up to 500 μg/m3 (≈ 250 nmol/mol at 20 °C, 101,3 kPa).
Keywords: EN 14625:2024, ozone measurement, UV photometry, ambient air monitoring, ozone analyser type approval, air quality standard, CEN.
Frequently Asked Questions
EN 14625:2024 is a standard published by the European Committee for Standardization (CEN). Its full title is "Ambient air - Standard method for the measurement of the concentration of ozone by ultraviolet photometry". This standard covers: This European Standard specifies a continuous measurement method for the determination of the concentrations of ozone present in ambient air based on the ultraviolet photometric measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate ultraviolet photometric analyser by means of type approval tests. It also includes the evaluation of the suitability of an analyser for use in a specific fixed site so as to meet the data quality requirements as specified in Annex I of Directive 2008/50/EC [1] and requirements during sampling, calibration and quality assurance for use. The method is applicable to the determination of the concentration of ozone present in ambient air up to 500 μg/m3. This concentration range represents the certification range for ozone for the type approval test. NOTE 1 Other ranges may be used for measurement systems applied at rural locations monitoring ecosystems. NOTE 2 When the standard is used for other purposes than Directive 2008/50/EC, the ranges and uncertainty requirements may not apply. The method covers the determination of ambient air concentrations of ozone in zones classified as rural areas, urban and urban-background areas. The results are expressed in μg/m3 (at 20 °C and 101,3 kPa). NOTE 3 500 μg/m3 of O3 corresponds to 250 nmol/mol of O3 at 20 °C and 101,3 kPa. This standard contains information for different groups of users. Clauses 5 to 7 and Annexes B and C contain general information about the principles of ozone measurement by ultraviolet photometric analyser and sampling equipment. Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of ozone analysers. These sections contain information about: − type-approval test conditions, test procedures and test requirements; − analyser performance requirements; − evaluation of the type-approval test results; − evaluation of the uncertainty of the measurement results of the ozone analyser based on the type-approval test results. Clauses 9 to 11 and Annexes F and G are directed towards monitoring networks performing the practical measurements of ozone in ambient air. These sections contain information about: − initial installation of the analyser in the monitoring network and acceptance testing; − ongoing quality assurance/quality control; − calculation and reporting of measurement results; − evaluation of the uncertainty of measurement results under practical monitoring conditions.
This European Standard specifies a continuous measurement method for the determination of the concentrations of ozone present in ambient air based on the ultraviolet photometric measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate ultraviolet photometric analyser by means of type approval tests. It also includes the evaluation of the suitability of an analyser for use in a specific fixed site so as to meet the data quality requirements as specified in Annex I of Directive 2008/50/EC [1] and requirements during sampling, calibration and quality assurance for use. The method is applicable to the determination of the concentration of ozone present in ambient air up to 500 μg/m3. This concentration range represents the certification range for ozone for the type approval test. NOTE 1 Other ranges may be used for measurement systems applied at rural locations monitoring ecosystems. NOTE 2 When the standard is used for other purposes than Directive 2008/50/EC, the ranges and uncertainty requirements may not apply. The method covers the determination of ambient air concentrations of ozone in zones classified as rural areas, urban and urban-background areas. The results are expressed in μg/m3 (at 20 °C and 101,3 kPa). NOTE 3 500 μg/m3 of O3 corresponds to 250 nmol/mol of O3 at 20 °C and 101,3 kPa. This standard contains information for different groups of users. Clauses 5 to 7 and Annexes B and C contain general information about the principles of ozone measurement by ultraviolet photometric analyser and sampling equipment. Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of ozone analysers. These sections contain information about: − type-approval test conditions, test procedures and test requirements; − analyser performance requirements; − evaluation of the type-approval test results; − evaluation of the uncertainty of the measurement results of the ozone analyser based on the type-approval test results. Clauses 9 to 11 and Annexes F and G are directed towards monitoring networks performing the practical measurements of ozone in ambient air. These sections contain information about: − initial installation of the analyser in the monitoring network and acceptance testing; − ongoing quality assurance/quality control; − calculation and reporting of measurement results; − evaluation of the uncertainty of measurement results under practical monitoring conditions.
EN 14625:2024 is classified under the following ICS (International Classification for Standards) categories: 13.040.20 - Ambient atmospheres. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 14625:2024 has the following relationships with other standards: It is inter standard links to EN 14625:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 14625:2024 is associated with the following European legislation: EU Directives/Regulations: 2008/50/EC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN 14625:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2025
Nadomešča:
SIST EN 14625:2012
Zunanji zrak - Standardna metoda za določanje koncentracije ozona z
ultravijolično fotometrijo
Ambient air - Standard method for the measurement of the concentration of ozone by
ultraviolet photometry
Außenluft - Messverfahren zur Bestimmung von Ozon in Luft mit dem UV-Verfahren
Air ambiant - Méthode normalisée de mesurage de la concentration en ozone par
photométrie U.V.
Ta slovenski standard je istoveten z: EN 14625:2024
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 14625
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 13.040.20 Supersedes EN 14625:2012
English Version
Ambient air - Standard method for the measurement of the
concentration of ozone by ultraviolet photometry
Air ambiant - Méthode normalisée de mesurage de la Außenluft - Messverfahren zur Bestimmung von Ozon
concentration en ozone par photométrie U.V. in Luft mit dem UV-Verfahren
This European Standard was approved by CEN on 11 November 2024.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14625:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 10
4 Abbreviated terms . 16
5 Principle . 16
5.1 General . 16
5.2 Measuring principle . 16
5.3 Type testing . 17
5.4 Field operation and quality control. 18
6 Sampling . 18
6.1 General . 18
6.2 Sampling location . 19
6.3 Sampling system . 19
6.3.1 Construction . 19
6.3.2 Particle filter . 19
6.4 Loss of ozone . 20
6.5 Control and regulation of sample flow rate . 20
6.6 Sampling pump for the manifold . 20
7 Analyser equipment . 20
7.1 General . 20
7.2 Ultraviolet absorption cell . 21
7.3 Ultraviolet source lamp . 21
7.4 UV detector . 21
7.5 Ozone-specific scrubber . 21
7.6 Switching valve . 21
7.7 Temperature indicator . 22
7.8 Pressure indicator . 22
7.9 Flow rate indicator . 22
7.10 Sampling pump for the analyser . 22
7.11 Internal ozone span source . 22
7.12 Particle filter . 22
8 Type testing of ultraviolet photometric ozone analysers . 22
8.1 General . 22
8.2 Relevant performance characteristics and performance criteria. 23
8.3 Design change . 27
8.4 Procedures for determination of the performance characteristics during the
laboratory test . 27
8.4.1 General . 27
8.4.2 Test conditions . 27
8.4.3 Response time . 29
8.4.4 Short-term drift . 31
8.4.5 Repeatability standard deviation. 32
8.4.6 Lack of fit of linearity of the calibration function . 32
8.4.7 Sensitivity coefficient to sample gas pressure . 33
8.4.8 Sensitivity coefficient to sample gas temperature . 34
8.4.9 Sensitivity coefficient to the surrounding temperature . 34
8.4.10 Sensitivity coefficient to electrical voltage . 35
8.4.11 Interferents . 36
8.4.12 Averaging test . 36
8.4.13 Difference sample/calibration port . 37
8.4.14 Residence time in the analyser . 38
8.5 Determination of the performance characteristics during the field test . 38
8.5.1 General . 38
8.5.2 Selection of a monitoring station for the field test . 38
8.5.3 Operational requirements . 39
8.5.4 Long-term drift . 40
8.5.5 Reproducibility standard deviation under field conditions . 40
8.5.6 Period of unattended operation . 41
8.5.7 Period of availability of the analyser . 41
8.6 Type testing and uncertainty calculation . 42
9 Field operation and ongoing quality control . 42
9.1 General . 42
9.2 Suitability evaluation . 43
9.2.1 General . 43
9.2.2 Analyser for a monitoring station or task. 43
9.3 Initial installation . 44
9.4 Ongoing quality assurance/quality control . 46
9.4.1 General . 46
9.4.2 Frequency of calibrations, checks and maintenance . 47
9.5 Calibration of the analyser . 50
9.5.1 General . 50
9.5.2 Calibration gases . 51
9.5.3 Data adjustment function . 51
9.5.4 Testing the sampling system . 51
9.5.5 Treatment of data after exceedance of performance criteria . 53
9.6 Checks . 55
9.6.1 Zero and span checks . 55
9.6.2 Lack of fit . 56
9.6.3 Testing the sample manifold . 57
9.7 Maintenance . 58
9.7.1 Change of particle filters . 58
9.7.2 Maintenance of sampling system . 58
9.7.3 Change of consumables as applicable . 58
9.7.4 Preventive/routine maintenance of components of the analyser . 58
9.8 Data handling and data reports . 59
9.9 Measurement uncertainty . 59
10 Expression of results . 59
11 Test reports and documentation . 60
11.1 Type testing . 60
11.2 Field operation . 61
11.2.1 Suitability evaluation . 61
11.2.2 Documentation . 61
11.2.3 Ambient air quality data reports . 61
Annex A (normative) Test of lack of fit . 63
A.1 Establishment of the regression line . 63
A.2 Calculation of the residuals of the averages . 64
Annex B (informative) Sampling equipment . 65
Annex C (informative) Ultraviolet photometric analyser . 67
Annex D (informative) Manifold testing . 69
D.1 Procedure for applying test gas . 69
D.2 Procedure for the cross test . 70
D.2.1 General . 70
D.2.2 Initial stage . 70
D.2.3 Stage 1 . 71
D.2.4 Stage 2 . 71
D.2.5 Data Processing . 71
D.2.6 Evaluation . 71
Annex E (normative) Type testing. 73
E.1 Type testing and uncertainty calculation . 73
E.1.1 Type testing . 73
E.1.2 Uncertainty calculation . 73
E.2 Type testing Requirement a) . 73
E.3 Type testing Requirement b) . 75
E.3.1 General . 75
E.3.2 Calculation of standard uncertainties . 78
E.3.2.1 General . 78
E.3.2.2 Repeatability at zero . 78
E.3.2.3 Repeatability at the hourly alert threshold value of ozone . 78
E.3.2.4 Lack of fit . 79
E.3.2.5 Influence quantities . 79
E.3.2.5.1 . General
............................................................................................................................................................................. 79
E.3.2.5.2 . Sample gas
pressure . 80
E.3.2.5.3 . Sample gas
temperature . 80
E.3.2.5.4 . Surrounding
temperature . 80
E.3.2.5.5 . Electrical
voltage . 81
E.3.2.5.6 . Water
vapour . 81
E.3.2.5.7. Other
interferents . 82
E.3.2.5.8. Averaging
effect . 83
E.3.2.5.9. Calibration
gas. 83
E.3.2.5.10 . Difference sample/calibration
port . 83
E.3.3 Example calculation . 84
E.4 Type testing Requirement c) . 85
E.5 Type testing Requirement d). 85
E.5.1 General . 85
E.5.2 Combined standard uncertainty . 87
E.5.3 Absolute expanded uncertainty . 87
E.5.4 Relative expanded uncertainty . 87
E.5.5 Calculation of standard uncertainties . 88
E.5.6 Example calculation . 90
Annex F (informative) Calculation of uncertainty in field operation at the hourly alert
threshold value . 92
F.1 General . 92
F.2 Combined standard uncertainty . 92
F.3 Standard uncertainties . 93
F.3.1 General . 93
F.3.1.1 Introduction. 93
F.3.1.2 Repeatability at zero . 93
F.3.1.3 Repeatability at the hourly alert threshold value . 93
F.3.1.4 Lack of fit . 93
F.3.2 Influence quantities . 94
F.3.2.1 General . 94
F.3.2.2 Sample gas pressure . 94
F.3.2.3 Sample gas temperature . 94
F.3.2.4 Surrounding temperature . 95
F.3.2.5 Electrical voltage . 96
F.3.3 Interferents . 96
F.3.3.1 General . 96
F.3.3.2 Water vapour . 96
F.3.3.3 Other interferents . 97
F.3.4 Averaging effect . 97
F.3.5 Reproducibility under field conditions . 97
F.3.6 Long-term drift at zero . 97
F.3.7 Long-term drift at level of the hourly alert threshold value . 98
F.3.8 Zero gas . 98
F.3.9 Calibration gas . 98
F.3.10 Difference sample/calibration port . 98
F.4 Example calculation . 99
Annex G (informative) Calculation of uncertainty in field operation at the 8-hour target
value . 101
G.1 General . 101
G.2 Combined standard uncertainty . 101
G.3 Standard uncertainties . 102
G.3.1 General . 102
G.3.1.1 Introduction . 102
G.3.1.2 Repeatability at zero . 102
G.3.1.3 Repeatability at the 8-hour target value . 103
G.3.1.4 Lack of fit . 103
G.3.2 Influence quantities . 103
G.3.2.1 General . 103
G.3.2.2 Sample gas pressure . 104
G.3.2.3 Sample gas temperature . 104
G.3.2.4 Surrounding temperature . 105
G.3.2.5 Electrical voltage . 105
G.3.3 Interferents . 106
G.3.3.1 General . 106
G.3.3.2 Water vapour . 106
G.3.3.3 Other interferents . 107
G.3.4 Averaging effect . 108
G.3.5 Zero gas . 108
G.3.6 Calibration gas . 108
G.3.7 Difference sample/calibration port . 108
G.3.8 Reproducibility under field conditions . 108
G.3.9 Long-term drift at zero . 109
G.3.10 Long-term drift at level of the 8-hour target value . 109
G.4 Example calculation . 110
Annex H (informative) Test stand for the test point "sensitivity coefficient of sample gas
pressure" . 112
Annex I (informative) Significant changes. 113
Bibliography . 114
European foreword
This document (EN 14625:2024) has been prepared by 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 June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
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 14625:2012.
In comparison with the previous edition, the technical modifications listed in Annex I of this document
have been made.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies a continuous measurement method for the determination of the concentrations
of ozone present in ambient air based on the ultraviolet photometric measuring principle. This document
describes the performance characteristics and sets the relevant minimum criteria required to select
an appropriate ultraviolet photometric analyser by means of type testing. It also includes the evaluation
of the suitability of an analyser for use in a specific fixed site in order to meet the data quality
requirements (see Annex I of Directive 2008/50/EC [1] for additional information) and requirements
during sampling, calibration and quality assurance for use.
The method is applicable to the determination of the concentration of ozone present in ambient air
up to 500 µg/m . This concentration range represents the certification range for ozone for type testing.
NOTE 1 Other ranges may be used for measurement systems applied at rural locations monitoring ecosystems.
NOTE 2 When this document is used for other purposes than Directive 2008/50/EC, the ranges and uncertainty
requirements may not apply.
The method covers the determination of ambient air concentrations of ozone in zones classified as rural
areas, urban and urban-background areas.
The results are expressed in µg/m (at 20 °C and 101,3 kPa).
NOTE 3 500 µg/m of O3 corresponds to 250 nmol/mol of O3 at 20 °C and 101,3 kPa.
This document contains information for different groups of users.
Clause 5 to Clause 7 and Annex B and Annex C contain general information about the principles of ozone
measurement by ultraviolet photometric analyser and sampling equipment.
Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type
testing of ozone analysers. These sections contain information about:
— type testing conditions, test procedures and test requirements;
— analyser performance requirements;
— evaluation of the type testing results;
— evaluation of the associated uncertainty of the measurement performed by the ozone analyser based
on the type testing results.
Clause 9 to Clause 11 and Annex F and Annex G are directed towards monitoring networks performing
the practical measurements of ozone in ambient air. These sections contain information about:
— initial installation of the analyser in the monitoring network and acceptance testing;
— ongoing quality assurance/quality control;
— calculation and reporting of measurement results;
— evaluation of the uncertainty of measurement results under practical monitoring conditions.
This document represents an evolution of earlier editions (EN 14625:2005 and EN 14625:2012).
NOTE 4 Analysers type tested prior to the publication of this document can still be used for regulated monitoring
purposes. As newer versions of analysers tested under this document become available, discontinue the use of older
reference analysers.
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.
EN 15267-1, Air quality - Assessment of air quality monitoring equipment - Part 1: General principles of
certification
EN 15267-2, Air quality - Assessment of air quality monitoring equipment - Part 2: Initial assessment of the
manufacturer’s quality management system and post certification surveillance for the manufacturing
process
EN ISO 6145-6, Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 6:
Critical flow orifices (ISO 6145-6)
EN ISO 6145-7, Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 7:
Thermal mass-flow controllers (ISO 6145-7)
EN ISO 14956, Air quality - Evaluation of the suitability of a measurement procedure by comparison with a
required measurement uncertainty (ISO 14956)
ISO 19229, Gas analysis – Purity analysis and the treatment of purity data
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
adjustment of a measuring system
set of operations carried out on a measuring system so that it provides prescribed indications
corresponding to given values of a quantity to be measured
Note 1 to entry: Types of adjustment of a measuring system include zero adjustment of a measuring system, offset
adjustment, and span adjustment (sometimes called gain adjustment).
Note 2 to entry: Adjustment of a measuring system should not be confused with calibration, which is a prerequisite
for adjustment.
Note 3 to entry: In the context of this document, adjustment is performed on measurement data rather than on the
analyser.
[SOURCE: JCGM 200:2012 (VIM) [2]]
3.2
alert threshold
level beyond which there is a risk to human health from brief exposure for the population as a whole
and at which immediate steps are to be taken by the Member States
[SOURCE: Council Directive 2008/50/EC [1]]
3.3
ambient air
outdoor air in the troposphere, where provisions concerning health and safety at work apply and to which
members of the public do not have regular access
Note 1 to entry: This excludes workplaces as defined by Directive 89/654/EEC
[SOURCE: Council Directive 2008/50/EC [1]]
3.4
analyser
measuring system that provides an output signal which is a function of the concentration or partial
pressure of one or more components in a gas mixture and flow or temperature of this gas mixture
3.5
availability of the analyser
fraction of the total time period for which valid measuring data of the ambient air concentration
is available from an analyser
3.6
calibration
operation that, under specified conditions, in a first step, establishes a relation between the quantity
values with measurement uncertainties provided by measurement standards and corresponding
indications with associated measurement uncertainties and, in a second step, uses this information
to establish a relation for obtaining a measurement result from an indication
Note 1
...
Die Norm EN 14625:2024 stellt eine wesentliche Richtlinie für die kontinuierliche Messung der Ozonkonzentration in der Umgebungsluft dar, die auf dem Prinzip der ultravioletten Photometrie basiert. Der Geltungsbereich dieser Norm ist klar definiert und reicht bis zu Konzentrationen von 500 μg/m³, was den Zertifizierungsbereich für Ozon im Rahmen der Typgenehmigungstestungen darstellt. Die Norm ist insbesondere relevant für verschiedene Nutzergruppen, darunter Betreiber von Überwachungsnetzen sowie Prüflabore, die Typgenehmigungsprüfungen durchführen. Ein herausragendes Merkmal der Norm ist die detaillierte Beschreibung der Leistungsmerkmale und der Auswahlkriterien für geeignete ultraviolette Photometer. Die Mindestanforderungen, die für die Auswahl eines Analysegeräts erforderlich sind, werden umfassend behandelt, was die Zuverlässigkeit und Genauigkeit der Ozonmessungen erhöht. Insbesondere die Abschnitte 5 bis 7 sowie die Anhänge B und C liefern grundlegende Informationen über die Prinzipien der Ozonmessung und die notwendige Probentechnik. Ein weiterer Stärkenpunkt der EN 14625:2024 ist die Berücksichtigung der Eignung von Analysatoren für feste Messstandorte. Die Norm legt großen Wert auf die Qualitätssicherung und die Anforderungen an die Kalibrierung, um die Datenqualität gemäß den Vorgaben in Anhang I der Richtlinie 2008/50/EG zu gewährleisten. Dies ist besonders wichtig, da die Ergebnisse in μg/m³ bei standardisierten Bedingungen (20 °C, 101,3 kPa) angegeben werden. Für Testhäuser und Labore, die Typgenehmigungsprüfungen von Ozonanalysatoren durchführen, bietet die Norm präzise Anleitungen in den Abschnitten 8 und den Anhängen E. Diese Informationen sind entscheidend für das Verständnis der Testbedingungen, Verfahren und Anforderungen, die sicherstellen, dass die Messgeräte den erforderlichen Leistungen entsprechen und die Messunsicherheiten adäquat bewertet werden. Für praktische Überwachungsnetze sind die Informationen in den Abschnitten 9 bis 11 sowie den Anhängen F und G von hoher Bedeutung. Sie beziehen sich auf die Installation der Analysatoren, die kontinuierliche Qualitätssicherung sowie die Berechnung und Berichterstattung der Messergebnisse. Die Norm stellt sicher, dass die Ergebnisse der Ozonmessungen im direkten Übereinstimmung mit den Anforderungen der Überwachungsbedingungen stehen. Insgesamt bietet die EN 14625:2024 eine umfassende, qualitativ hochwertige Grundlage für die Messung der Ozonkonzentrationen in der Umgebungsluft. Sie ist nicht nur für die Erfüllung regulatorischer Anforderungen von Bedeutung, sondern fördert auch die Entwicklung und Implementierung von Messmethoden, die präzise und verlässliche Umweltdaten liefern.
The standard EN 14625:2024 provides a comprehensive framework for the measurement of ozone concentrations in ambient air using ultraviolet photometry. Its scope is clearly defined, emphasizing continuous measurement methods that are essential for accurate monitoring of ozone levels, particularly given the implications for air quality and public health. One of the strengths of this standard is its detailed description of performance characteristics and the minimum criteria necessary for selecting appropriate ultraviolet photometric analysers. This is critical for ensuring that the equipment used is both reliable and effective in measuring ozone concentrations accurately. The inclusion of type approval tests ensures that only equipment meeting stringent criteria is utilized, thereby enhancing the quality and credibility of the data collected. The standard's relevance is underscored by its alignment with Directive 2008/50/EC, particularly in relation to data quality requirements. By addressing specific conditions for the application of these measurements in different environments-urban, rural, and urban-background zones-it ensures the method is adaptable and applicable to a wide variety of monitoring contexts. Furthermore, the notes on utilizing the standard outside of the directive context reinforce its flexibility, although they also warrant caution regarding the applicability of certain ranges and uncertainty requirements. Clauses 5 to 11, along with the respective annexes, provide robust guidance tailored for various stakeholders, including laboratories and monitoring networks. The information on test procedures, performance evaluations, and ongoing quality assurance processes is invaluable for maintaining high standards of air quality monitoring. This ensures that the methodology remains effective and that the results are reliable over time. Moreover, the standard’s approach to reporting and evaluating measurement results emphasizes the importance of transparency and accuracy in ozone monitoring. By outlining specific procedures for installation, acceptance testing, and ongoing quality control, it enables monitoring networks to ensure that their systems consistently produce valid measurements. In conclusion, EN 14625:2024 stands out as a critical resource in the field of environmental monitoring, particularly for those focused on the measurement of ozone in ambient air. Its thorough consideration of both the technical and practical aspects of ultraviolet photometric measurement methods ensures that it remains relevant and essential for achieving accurate ozone assessments in various air quality contexts.
La norme EN 14625:2024 constitue un document essentiel pour la mesure de la concentration d'ozone dans l'air ambiant, s'appuyant sur le principe de photométrie ultraviolet. Son champ d'application est clairement défini, permettant la détermination de concentrations d'ozone jusqu'à 500 μg/m³, ce qui représente une plage de certification cruciale pour les tests d'approbation de type. Ce standard est non seulement pertinent pour les zones urbaines et rurales, mais il établit également des critères minimaux pour la sélection d'analyseurs photométriques ultraviolets appropriés, garantissant ainsi la fiabilité des résultats obtenus. Une des forces majeures de la norme réside dans ses spécifications détaillées concernant les caractéristiques de performance et les exigences de qualité des données, conformément à l'Annexe I de la Directive 2008/50/EC. Les clauses 5 à 7 ainsi que les Annexes B et C fournissent des informations précieuses sur les principes de mesure de l'ozone, cruciales pour les utilisateurs impliqués dans des mesures continues. De plus, la norme se distingue par ses recommandations précises pour les établissements de test et les laboratoires, décrites dans la clause 8 et l'Annexe E. Ces sections clarifient les conditions de test et les exigences de performance des analyseurs, ce qui est fondamental pour garantir la validité des résultats des tests d'approbation de type. Enfin, les clauses 9 à 11, accompagnées des Annexes F et G, ciblent spécifiquement les réseaux de surveillance. Elles abordent des éléments critiques tels que l'installation initiale des analyseurs, l'assurance qualité, ainsi que la gestion de l'incertitude des résultats de mesure dans des conditions de surveillance pratique. Cela renforce la pertinence et l'applicabilité de la norme EN 14625:2024 pour garantir des mesures d'ozone précises et fiables dans divers contextes environnementaux.
EN 14625:2024規格は、紫外線光度法に基づく大気中オゾン濃度測定のための連続測定手法を明確に規定しています。この規格は、環境中のオゾン濃度を正確に評価するための性能特性を示し、適切な紫外線光度計を選定するための最低基準を設定しています。特に、2008/50/EC指令の附属書Iに示されたデータ品質要件を満たすために、特定の固定サイトでのアナライザーの適合性評価を含んでいます。この標準化文書は、オゾン濃度測定の重要性を理解する上で必須のリソースです。 この標準の強みは、その明確な適用範囲にあります。最大500μg/m³のオゾン濃度を測定する能力は、オゾンの型式承認試験において確立された認証範囲を示しており、農村地域や都市部の背景区域等、異なる地域でのオゾン濃度測定に対応しています。その測定結果は、20°Cおよび101.3kPaにおいてμg/m³単位で表現され、ヘルスケアや環境モニタリングにおける透明性と一貫性を保証します。 また、規格は異なる利用者グループに向けて情報を提供しており、紫外線光度アナライザーによるオゾン測定の原則や、サンプリング機器に関する一般的な情報が第5から第7条および附属書BおよびCに記載されています。型式承認を実施する試験所やラボラトリー向けの詳細は、第8条および附属書Eに明示されています。これには、型式承認試験の条件、手続き、要求事項が含まれ、オゾンアナライザーの性能要件および試験結果の不確かさの評価が詳細に説明されています。 最後に、モニタリングネットワークによる実際の大気中オゾンの測定に関しては、第9から第11条および附属書FおよびGが焦点を当てており、アナライザーの初期設置、品質保証、測定結果の計算および報告が含まれています。これにより、現場での測定条件下における測定結果の不確かさを評価し、環境におけるオゾンの観測精度を高めることが可能です。 このように、EN 14625:2024は、オゾン濃度測定のための確固たる基盤を提供し、環境モニタリング活動にとって重要な役割を果たすことが期待されます。
SIST EN 14625:2025 표준은 대기 중 오존 농도의 측정을 위한 유효한 방법을 제공합니다. 이 표준의 주요 특징은 자외선 광도계를 기반으로 한 지속적인 측정 방식을 명시하고, 오존 분석기에 대한 성능 특성과 최저 기준을 설정하여 적절한 분석기를 선택하는 데 필요한 정보를 제공합니다. 이 표준은 대기 중 오존 농도를 측정할 수 있는 범위가 500 μg/m³까지 포함되어 있으며, 이는 오존 유형 승인 시험을 위한 인증 범위로 설정되어 있습니다. 또한, 이 표준은 농촌 지역, 도시 지역 및 도시 배경 지역의 오존 농도 측정을 다루어 다양한 환경 조건에서 적용될 수 있는 점이 강점입니다. SIST EN 14625:2025의 문서 구조는 사용자 그룹에 맞춰 세분화되어 있으며, 5조에서 7조 및 부록 B와 C는 오존 분석기를 통한 측정 원칙과 샘플링 장비에 대한 정보를 제공하고 있습니다. 8조 및 부록 E는 오존 분석기의 유형 승인 시험을 수행하는 시험소와 실험실을 대상으로 하여 시험 조건, 시험 절차 및 성능 요구사항을 상세히 설명하고 있습니다. 또한, 9조에서 11조 및 부록 F와 G는 대기 중 오존의 실질적인 측정을 수행하는 모니터링 네트워크에 중점을 두고 있으며, 초기 설치 및 수용 시험, 지속적인 품질 보증/품질 관리, 측정 결과의 계산 및 보고, 실질적인 모니터링 조건에서의 측정 결과 불확실성 평가 등에 대해 설명하고 있습니다. 이 표준은 특히 2008/50/EC 지침에 의거한 데이터 품질 요구사항을 충족시키기 위한 필수적인 정보를 제공하며, 환경 모니터링 및 공공 건강 보호에 기여할 수 있는 중요한 문서입니다.
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