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
Relations
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
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...