SIST EN 14625:2025
(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 ultraviolettphotometrisches Messverfahren zur Bestimmung der Konzentration von Ozon in Luft fest. Es nennt die Leistungskenngrößen und legt die Mindestanforderungen für die Eignungsprüfung von UV-photometrischen Messgeräten fest. Es beinhaltet auch die Bewertung der Eignung eines Messgeräts für den Einsatz an einem bestimmten ortsfesten Messstandort bezüglich der Anforderungen an die Datenqualität nach Anhang I der Richtlinie 2008/50/EG [1] und bezüglich der Anforderungen für Probennahme, Kalibrierung und Qualitätssicherung.
Das Verfahren ist anwendbar zur Bestimmung der Massenkonzentration von Ozon in Luft im Bereich bis 500 μg/m3. Dieser Konzentrationsbereich entspricht dem Zertifizierungsbereich für Ozon für die Eignungsprüfung.
ANMERKUNG 1 Für ländliche Standorte zur Überwachung von Ökosystemen können auch andere Bereiche gewählt werden.
ANMERKUNG 2 Wird dieses Dokument für andere Zwecke als für Messungen nach Richtlinie 2008/50/EG eingesetzt, dann brauchen die Anforderungen hinsichtlich Anwendungsbereich und Unsicherheit nicht zur Geltung kommen.
Das Verfahren umfasst die Bestimmung der Konzentration von Ozon an Standorten, die als ländlich, städtisch und städtischer Hintergrund klassifiziert sind.
Die Ergebnisse werden in μg/m3 (bei 20 °C und 101,3 kPa) angegeben.
ANMERKUNG 3 00 μg/m3 O3 entsprechen 250 nmol/mol O3 bei 20 °C und 101,3 kPa.
Dieses Dokument enthält Informationen für verschiedene Nutzergruppen.
Abschnitt 5 bis Abschnitt 7 und die 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 Unsicherheit der Messergebnisse des Ozon-Messgeräts anhand der Eignungsprüfungsergebnisse.
Abschnitt 9 bis Abschnitt 11 und Anhang F und Anhang G richten sich an die Betreiber von Messnetzen, mit denen Ozon-Messungen in Luft 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.
Das vorliegende Dokument stellt eine Weiterentwicklung der vorangegangenen Ausgaben (EN 14625:2005 und EN 14625:2012) dar. Es wird empfohlen, dass bei der Beschaffung von Geräten diese vollständig mit dem vorliegenden Dokument übereinstimmen.
ANMERKUNG 4 Eignungsprüfungen, die vor der Veröffentlichung dieses Dokuments zum Zweck des Nachweises der Gleichwertigkeit durchgeführt wurden, sind weiterhin gültig.
ANMERKUNG 5 Eignungsprüfungen von Messgeräten, die vor der Veröffentlichung dieses Dokuments durchgeführt wurden, bleiben weiterhin für die Verwendung für regulierte Beobachtungszwecke gültig.
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
- Public Enquiry End Date
- 02-Jan-2023
- Publication Date
- 03-Mar-2025
- Technical Committee
- KAZ - Air quality
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 10-Feb-2025
- Due Date
- 17-Apr-2025
- Completion Date
- 04-Mar-2025
Relations
- Effective Date
- 01-Apr-2025
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
SIST EN 14625:2025 is a standard published by the Slovenian Institute for Standardization (SIST). 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.
SIST EN 14625:2025 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.
SIST EN 14625:2025 has the following relationships with other standards: It is inter standard links to SIST EN 14625:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 14625:2025 is associated with the following European legislation: EU Directives/Regulations: 2008/50/EC, 2011-01-2525. 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 SIST EN 14625:2025 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 SIST 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 SIST EN 14625:2025 für die Messung der Ozonkonzentration in der Außenluft durch ultraviolette Photometrie bietet ein umfassendes und detailliertes Verfahren zur kontinuierlichen Messung von Ozon in der Umgebungsluft. Der Anwendungsbereich dieser Europäischen Norm ist klar definiert und umfasst sowohl ländliche als auch städtische Gebiete, was ihre Relevanz in unterschiedlichen Umgebungen unterstreicht. Ein wesentlicher Stärke der Norm ist die präzise Festlegung der Leistungsmerkmale von Ozonmessgeräten, einschließlich der Mindestkriterien zur Auswahl geeigneter Geräte durch Typgenehmigungstests. Dieses feste Fundament gewährleistet die Konsistenz und Zuverlässigkeit der Messergebnisse. Insbesondere werden hier Anforderungen während der Probenahme, Kalibrierung und Qualitätssicherung thematisiert, die für die Einhaltung der Datenqualitätsanforderungen der Richtlinie 2008/50/EG unerlässlich sind. Die Norm berücksichtigt auch verschiedene Nutzergruppen und stellt sicher, dass die Praktiken für die Typgenehmigung sowie die laufende Qualitätskontrolle in Überwachungsnetzwerken klar umrissen sind. Die Abschnitte über die Bedingungen und Verfahren für Typgenehmigungstests sind speziell auf Testhäuser und Labore ausgerichtet, was die Relevanz der Norm in der Gesamtheit der Prüf- und Messkette weiter verstärkt. Darüber hinaus gibt die Norm Auskunft über die Unsicherheitsbewertung der Messergebnisse, was für die Glaubwürdigkeit der Daten und deren Interpretation von größter Bedeutung ist. Die klare Spezifizierung des Konzentrationsbereichs von bis zu 500 μg/m³ macht die Anwendung der Norm für die Zertifizierung von Ozonmessgeräten besonders wirkungsvoll. Insgesamt stellt die SIST EN 14625:2025 eine grundlegende Ressource für alle Institutionen dar, die sich mit der Überwachung von Ozon in der Außenluft befassen. Die Norm gewährleistet nicht nur die Präzision von Messungen, sondern trägt auch zur Verbesserung der Luftqualität bei, indem sie ein einheitliches Verfahren für die erforderlichen Messungen bereitstellt.
SIST EN 14625:2025は、紫外線光度法に基づく環境空気中のオゾン濃度測定のための持続的測定工法を定義した欧州規格です。この標準は、オゾン測定に関連する主要な性能特性を明確にし、適切な紫外線光度計の選定に必要な最低基準を設定しています。 この標準の強みは、オゾン濃度を最大500 μg/m3まで測定できる点です。この範囲は、タイプ承認試験におけるオゾンの認証範囲を示しており、実際の測定においても信頼性が高いと言えます。また、本標準は、農村地域や都市、都市背景地区におけるオゾン濃度の測定に対応しており、多様な環境での適用性が考慮されています。 文書は、さまざまな利用者向けに情報を提供しており、特にクローズ5から7および附属書BとCには、紫外線光度計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含まれています。クローズ8および附属書Eは、オゾン分析計のタイプ承認試験を実施する試験機関やlaboratories向けに特化しており、試験条件、試験手順、性能要件などが詳細に説明されています。 また、クローズ9から11におよび附属書FとGは、環境空気中のオゾンの実測を行うモニタリングネットワーク向けの情報を提供しています。これには、分析器の初期設置、品質保証/品質管理、測定結果の計算および報告方法についての情報が含まれています。これにより、実際の条件下での測定精度の評価が可能となります。 SIST EN 14625:2025は、国際的な基準に準拠することで、オゾンの測定に関する信頼性の高いデータを提供し、環境保護に寄与するものであり、その適用範囲、性能基準、ユーザー指導において非常に関連性の高い標準です。
The SIST EN 14625:2025 standard provides a comprehensive framework for measuring ozone concentrations in ambient air using ultraviolet photometry. Its clear scope focuses on the continuous measurement methodology, which is crucial for accurately assessing air quality in various environments, including rural, urban, and urban-background areas. One key strength of this standard is its detailed specification of the relevant performance characteristics and minimum criteria essential for selecting appropriate ultraviolet photometric analysers, ensuring that environmental monitoring meets rigorous data quality requirements established by the Directive 2008/50/EC. The standard supports a concentration measurement range of up to 500 μg/m3, which establishes a certification range for type approval tests. This clarity is instrumental for laboratories and testing houses, as outlined in Clauses 8 and Annex E, which provide specific insights into test conditions, procedures, and performance requirements of ozone analysers. Moreover, the inclusion of detailed evaluation criteria for type-approval test results adds robustness to the standard, fostering trust in measurement outcomes. Another significant aspect of the SIST EN 14625:2025 is its attention to the practical applications of the methodology. Clauses 9 to 11 and Annexes F and G address the needs of monitoring networks, imparting essential guidelines on initial installation, acceptance testing, and quality assurance protocols. This ensures that the analysers continue to operate effectively in providing reliable ambient air quality data, crucial for public health and policy-making. The flexibility noted in the use of the method for different measurement systems at rural locations monitoring ecosystems further emphasizes its adaptability, making the standard relevant not only for compliance with European directives but also for broader environmental assessments. The structured approach to presenting this information enhances the usability of the standard for diverse stakeholders, solidifying its position as a vital tool in ambient air quality monitoring efforts.
SIST EN 14625:2025 표준 문서는 대기 중 오존 농도의 측정을 위한 표준 방법을 규정하고 있으며, 주로 자외선 광측정 원리를 기반으로 한 연속 측정 방법을 제시합니다. 이 표준은 오존 측정에 필요한 성능 특성과 적절한 자외선 광측정 분석기를 선정하기 위한 최소 기준을 설정하고 있습니다. 특히, 2008/50/EC 지침의 부속서 I에 명시된 데이터 품질 요구 사항을 충족하기 위해 특정 고정 장소에서 분석기의 적합성을 평가하는 방법도 포함되어 있습니다. SIST EN 14625:2025의 주요 강점 중 하나는 대기 중 오존 농도를 최대 500 μg/m³까지 정량화할 수 있다는 점입니다. 이러한 농도 범위는 유형 승인 테스트를 위한 인증 범위를 의미하며, 농촌 지역에서 생태계를 모니터링하는 측정 시스템 적용 시 다른 범위도 사용할 수 있음을 고려하고 있습니다. 표준은 대기 중 오존 농도를 측정할 수 있는 다양한 공간인 농촌, 도시 및 도시 배경 지역을 포괄하며, 결과는 20 °C와 101.3 kPa에서 μg/m³로 표현됩니다. 또한 이 표준은 다양한 사용자 그룹에 대한 정보를 제공합니다. 절 5에서 7 및 부속서 B와 C는 자외선 광측정 분석기를 통한 오존 측정 원칙 및 샘플링 장비에 대한 일반적인 정보를 포함하고 있습니다. 절 8과 부속서 E는 오존 분석기의 유형 승인 테스트를 수행하는 테스트 하우스 및 실험실을 위한 내용을 담고 있으며, 여기에는 테스트 조건, 절차 및 요구 사항, 분석기 성능 요구 사항, 유형 승인 테스트 결과의 평가방식, 측정 결과의 불확실성 평가 방법 등이 포함됩니다. 마지막으로, 절 9에서 11 및 부속서 F와 G는 대기 중 오존의 실제 측정을 수행하는 모니터링 네트워크를 대상으로 하는 정보로, 분석기의 초기 설치와 수용 테스트, 지속적인 품질 보증 및 품질 관리, 측정 결과의 계산 및 보고, 실제 모니터링 조건 하에서 측정 결과의 불확실성 평가 등을 다루고 있습니다. 이러한 내용은 대기 질 관리를 위한 신뢰할 수 있는 데이터를 제공하는 데 있어 필수적입니다. 따라서 SIST EN 14625:2025 표준은 대기 중 오존 농도의 신뢰성 있는 측정 및 분석을 위한 권위 있는 지침으로 자리 잡고 있습니다.
La norme SIST EN 14625:2025 constitue un outil essentiel pour la mesure de la concentration d'ozone dans l'air ambiant, se fondant sur le principe de la photométrie ultraviolette. Son champ d'application est clairement défini, permettant la détermination précise des concentrations d'ozone jusqu'à 500 μg/m³, ce qui représente le seuil de certification lors des tests d'approbation de type. Cette standardisation est particulièrement pertinente dans le contexte de la directive 2008/50/CE, en garantissant que les appareils de mesure répondent aux exigences de qualité des données. Parmi ses forces, cette norme détaillée décrit les caractéristiques de performance requises pour sélectionner un analyseur photométrique ultraviolet approprié, ce qui est crucial pour les laboratoires et les maisons d'essai. Les clauses 5 à 7 ainsi que les annexes B et C fournissent des informations fondamentales sur les principes de mesure de l'ozone, ce qui facilite la compréhension et l'application correcte des méthodes de mesure. Les sections dédiées aux maisons de test et laboratoires, notamment clause 8 et annexe E, fournissent des procédures claires et des conditions d'essai, assurant ainsi que les résultats des tests d'approbation de type sont fiables. La performance des analyseurs est discutée de manière exhaustive, incluant l'évaluation des résultats de test et l’incertitude associée, ce qui est crucial pour garantir la précision des mesures. De plus, les clauses 9 à 11 et les annexes F et G sont orientées vers les réseaux de surveillance, abordant des thèmes tels que l'installation initiale des analyseurs, l'assurance qualité continue, et les méthodes de calcul et de rapport des résultats. Ces éléments renforcent la pertinence de la norme dans le cadre de la surveillance de la qualité de l'air, en s'assurant que les mesures pratiques de l'ozone répondent à des normes rigoureuses d’exactitude et de fiabilité. En somme, la norme SIST EN 14625:2025 mise sur une approche systématique et bien documentée pour la mesure de l'ozone dans l'air ambiant, la rendant indispensable tant pour les utilisateurs que pour les autorités réglementaires.
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