EN 14211:2012
(Main)Ambient air - Standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by chemiluminescence
Ambient air - Standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by chemiluminescence
This European Standard specifies a continuous measurement method for the determination of the concentrations of nitrogen dioxide and nitrogen monoxide present in ambient air based on the chemiluminescence measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate chemiluminescence 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 nitrogen dioxide present in ambient air up to 500 µg/m3. This concentration range represents the certification range for NO2 for the type approval test.
The method is applicable to the determination of the concentration of nitrogen monoxide present in ambient air up to 1 200 µg/m3. This concentration range represents the certification range for NO for the type approval test.
NOTE 1 It is possible to use other ranges depending on the levels present in ambient air.
NOTE 2 When this European Standard is used for other purposes than for measurements required by Directive 2008/50/EC, the ranges and uncertainty requirements may not apply.
The method covers the determination of ambient air concentrations of nitrogen dioxide and nitrogen monoxide in zones classified as rural areas, urban-background areas and traffic-orientated locations and locations influenced by industrial sources.
The results are expressed in µg/m3 (at 20 °C and 101,3 kPa).
NOTE 3 500 µg/m3 of NO2 corresponds to 261 nmol/mol of NO2 at 20 °C and 101,3 kPa. 1 200 µg/m3 of NO corresponds to 962 nmol/mol of NO 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 NOx measurement by chemiluminescence analyser and sampling equipment.
Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of NOx 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 NOx 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 NOx 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 der Konzentration von Stickstoffdioxid und Stickstoffmonoxid mit Chemilumineszenz
Dieses Dokument legt ein kontinuierliches Chemilumineszenz-Messverfahren zur Bestimmung der Konzentration von Stickstoff¬dioxid und Stickstoffmonoxid in Luft fest. Es nennt die Leistungs¬kenngrößen und legt die Mindestanforderungen für die Eignungsprüfung von Chemilumineszenz¬-Messgeräten fest. Es beinhaltet auch die Bewertung der Eignung eines Messgeräts zum Einsatz an einem bestimmten ortsfesten Messstandort bezüglich der Anforderungen der EU-Richtlinien an die Datenqualität und bezüglich der Anforderungen für Probennahme, Kalibrierung und Qualitätssicherung.
Das Verfahren ist anwendbar zur Bestimmung der Massenkonzentration von Stickstoffdioxid in Luft im Bereich von 0 µg/m³ bis 500 µg/m³. Dieser Konzentrationsbereich entspricht dem Zertifizierungsbereich für die Eignungsprüfung.
ANMERKUNG 1 500 µg/m3 an NO2 entsprechen 261 nmol/mol an NO2 bei 20 °C und 101,3 kPa.
Das Verfahren ist anwendbar zur Bestimmung der Massenkonzentration von Stickstoffmonoxid in Luft im Bereich von 0 µg/m³ bis 1 200 µg/m³. Dieser Konzentrationsbereich entspricht dem Zertifizierungsbereich für die Eignungsprüfung.
ANMERKUNG 2 1 200 µg/m3 an NO entsprechen 962 nmol/mol an NO bei 20 °C und 101,3 kPa.
Das Verfahren umfasst die Bestimmung der Konzentration von Stickstoffdioxid und Stickstoffmonoxid in Gebieten, die als ländliche Gebiete, Gebiete mit städtischem Hintergrund und verkehrsbezogene Standorte klassifiziert sind.
ANMERKUNG 3 Für Messeinrichtungen an ländlichen Standorten zur Überwachung von Ökosystemen können kleinere Konzentrationsbereiche verwendet werden.
Die Ergebnisse werden in µg/m³ (bei 20 °C und 101,3 kPa) angegeben.
Wird diese Norm für andere als in der EU-Richtlinie festgelegte Zwecke eingesetzt, dann brauchen die Anforderungen hinsichtlich Anwendungsbereich und Unsicherheit nicht zur Geltung kommen.
Dieses Dokument enthält Informationen für verschiedene Nutzergruppen.
Air ambiant - Méthode normalisée pour le mesurage de la concentration en dioxyde d'azote et monoxyde d'azote par chimiluminescence
La présente Norme européenne spécifie une méthode de mesurage en continu pour la détermination de la concentration en dioxyde d’azote et en monoxyde d’azote dans l’air ambiant, selon le principe de mesure par chimiluminescence. La présente norme décrit les caractéristiques de performance et fixe les critères minimaux requis pour sélectionner un analyseur par chimiluminescence approprié à l’aide d’essais d’approbation de type. Elle présente également l’évaluation de l’aptitude à l’emploi d’un analyseur sur un site fixe spécifique de manière à répondre aux exigences de qualité des données spécifiées dans l’Annexe I de la Directive 2008/50/CE [1] 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 dioxyde d’azote présent dans l’air ambiant jusqu’à 500 µg/m3. Cette plage de concentration représente l’étendue de mesure certifiée de NO2 pour l’essai d’approbation de type.
La méthode s’applique à la détermination de la concentration en monoxyde d’azote présent dans l’air ambiant jusqu’à 1 200 µg/m3. Cette plage de concentration représente l’étendue de mesure certifiée de NO pour l’essai d’approbation de type.
NOTE 1 D’autres plages peuvent être utilisées selon les niveaux présents dans l’air ambiant.
NOTE 2 Lorsque la norme est utilisée à d’autres fins que la Directive 2008/50/CE, les exigences relatives à la plage et à l’incertitude peuvent ne pas s’appliquer.
La méthode couvre la détermination des concentrations en dioxyde d’azote et en monoxyde d’azote présents dans l’air ambiant dans les zones classées comme zones rurales, urbaines de fond, proches d’axes de circulation automobile et influencées par des sources industrielles.
Les résultats sont exprimés en µg/m3 (à 20 °C et 101,3 kPa).
NOTE 3 500 µg/m3 de NO2 correspondent à 261 nmol/mol de NO2 à 20 °C et 101,3 kPa. 1 200 µg/m3 de NO correspondent à 962 nmol/mol de NO à 20 °C et 101,3 kPa.
La présente Norme 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 mesurage du NOx à l’aide d’un analyseur par chimiluminescence 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 des essais d’approbation de type des analyseurs de NOx. Ces sections contiennent des informations concernant :
- les conditions de l’essai d’approbation de type, les modes opératoires d’essai et les exigences d’essai ;
- les exigences de performance de l’analyseur ;
- l’évaluation des résultats de l’essai d’approbation de type ;
- l’évaluation de l’incertitude des résultats de mesurage de l’analyseur de NOx d’après les résultats de l’essai d’approbation de type.
Les Articles 9 à 11 et les Annexes F et G concernent les réseaux de surveillance effectuant les mesurages pratiques du NOx 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 mesurage ;
- l’évaluation de l’incertitude des résultats de mesurage sous des conditions de surveillance pratiques.
Zunanji zrak - Standardna metoda za določevanje koncentracije dušikovega dioksida in dušikovega monoksida s kemiluminiscenco
Ta evropski standard določa metodo stalnega merjenja za določitev koncentracij dušikovega dioksida in dušikovega monoksida v zunanjem zraku na podlagi kemoluminiscenčnega merilnega principa. Ta standard opisuje lastnosti delovanja in vzpostavlja ustrezna minimalna merila, ki so potrebna za izbiro primernega kemoluminiscenčnega analizatorja s homologacijskimi preizkusi. Vključuje tudi oceno ustreznosti analizatorja za uporabo na specifičnem fiksnem mestu, da se izpolnijo zahteve o kakovosti podatkov, kot je opredeljeno v Prilogi I Direktive 2008/50/EC [1], ter zahteve med vzorčenjem, kalibriranjem in zagotavljanjem kakovosti za uporabo. Ta metoda velja za določitev koncentracije dušikovega dioksida v zunanjem zraku do vrednosti 500 µg/m3. Ta razpon koncentracije predstavlja razpon certificiranja za NO2 za homologacijski preizkus. Ta metoda velja za določitev koncentracije dušikovega monoksida v zunanjem zraku do vrednosti 1.200 µg/m3. Ta razpon koncentracije predstavlja razpon certificiranja za NO za homologacijski preizkus.
OPOMBA 1: mogoča je uporaba drugih razponov, odvisno od ravni v zunanjem zraku.
OPOMBA 2: ko se ta evropski standard uporablja za druge namene, ne za meritve v skladu z Direktivo 2008/50/ES, zahteve glede razponov in negotovosti ne veljajo. Ta metoda pokriva določitev koncentracij dušikovega dioksida in dušikovega monoksida v zunanjem zraku na področjih, ki so uvrščena med podeželska območja, območja v urbanem okolju, prometna območja in lokacije, na katere vplivajo industrijski viri. Rezultati so izraženi v µg/m3 (pri 20 °C in 101,3 kPa).
OPOMBA: 3.500 µg/m3 NO2 ustreza 261 nmol/mol NO2 pri 20 °C in 101,3 kPa. 1.200 µg/m3 NO ustreza 962 nmol/mol NO pri 20 °C in 101,3 kPa. Ta standard vsebuje informacije za različne skupine uporabnikov. Določbe od 5 do 7 ter dodatka B in C vsebujejo splošne informacije o načelih merjenja NOx s kemoluminiscenčnimi analizatorji in opremo za vzorčenje. Osrednji predmet obravnave določbe 8 in dodatka E so laboratoriji, ki izvajajo homologacijske preizkuse analizatorjev NOx. Ti razdelki vsebujejo informacije o naslednjem:
– pogoji homologacijskega preizkusa, preizkusni postopki in zahteve;
– zahteve glede učinkovitosti analizatorja;
– ocena rezultatov homologacijskega preizkusa;
– ocena negotovosti rezultatov analizatorja NOx na podlagi rezultatov homologacijskega preizkusa. Osrednji predmet obravnave določb od 9 do 11 ter Dodat F in G je spremljanje delovanja mrež pri praktičnih meritvah NOx v zunanjem zraku. Ti razdelki vsebujejo informacije o naslednjem:
– začetna namestitev analizatorja v mreži za spremljanje stanja in preizkušanje ustreznosti;
– tekoče zagotavljanje kakovosti/nadzor kakovosti;
– računanje in poročanje rezultatov merjenja;
– ocena negotovosti rezultatov merjenja v okviru pogojev praktičnega spremljanja.
General Information
- Status
- Withdrawn
- Publication Date
- 21-Aug-2012
- Withdrawal Date
- 13-Apr-2025
- Technical Committee
- CEN/TC 264 - Air quality
- Current Stage
- 9960 - Withdrawal effective - Withdrawal
- Start Date
- 18-Dec-2024
- Completion Date
- 14-Apr-2025
Relations
- Effective Date
- 22-Dec-2008
- Effective Date
- 19-Jan-2023
Frequently Asked Questions
EN 14211:2012 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 nitrogen dioxide and nitrogen monoxide by chemiluminescence". This standard covers: This European Standard specifies a continuous measurement method for the determination of the concentrations of nitrogen dioxide and nitrogen monoxide present in ambient air based on the chemiluminescence measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate chemiluminescence 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 nitrogen dioxide present in ambient air up to 500 µg/m3. This concentration range represents the certification range for NO2 for the type approval test. The method is applicable to the determination of the concentration of nitrogen monoxide present in ambient air up to 1 200 µg/m3. This concentration range represents the certification range for NO for the type approval test. NOTE 1 It is possible to use other ranges depending on the levels present in ambient air. NOTE 2 When this European Standard is used for other purposes than for measurements required by Directive 2008/50/EC, the ranges and uncertainty requirements may not apply. The method covers the determination of ambient air concentrations of nitrogen dioxide and nitrogen monoxide in zones classified as rural areas, urban-background areas and traffic-orientated locations and locations influenced by industrial sources. The results are expressed in µg/m3 (at 20 °C and 101,3 kPa). NOTE 3 500 µg/m3 of NO2 corresponds to 261 nmol/mol of NO2 at 20 °C and 101,3 kPa. 1 200 µg/m3 of NO corresponds to 962 nmol/mol of NO 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 NOx measurement by chemiluminescence analyser and sampling equipment. Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of NOx 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 NOx 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 NOx 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 nitrogen dioxide and nitrogen monoxide present in ambient air based on the chemiluminescence measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate chemiluminescence 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 nitrogen dioxide present in ambient air up to 500 µg/m3. This concentration range represents the certification range for NO2 for the type approval test. The method is applicable to the determination of the concentration of nitrogen monoxide present in ambient air up to 1 200 µg/m3. This concentration range represents the certification range for NO for the type approval test. NOTE 1 It is possible to use other ranges depending on the levels present in ambient air. NOTE 2 When this European Standard is used for other purposes than for measurements required by Directive 2008/50/EC, the ranges and uncertainty requirements may not apply. The method covers the determination of ambient air concentrations of nitrogen dioxide and nitrogen monoxide in zones classified as rural areas, urban-background areas and traffic-orientated locations and locations influenced by industrial sources. The results are expressed in µg/m3 (at 20 °C and 101,3 kPa). NOTE 3 500 µg/m3 of NO2 corresponds to 261 nmol/mol of NO2 at 20 °C and 101,3 kPa. 1 200 µg/m3 of NO corresponds to 962 nmol/mol of NO 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 NOx measurement by chemiluminescence analyser and sampling equipment. Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of NOx 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 NOx 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 NOx 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 14211:2012 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 14211:2012 has the following relationships with other standards: It is inter standard links to EN 14211:2005, EN 14211:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 14211:2012 is associated with the following European legislation: EU Directives/Regulations: 1999/30/EC, 2008/50/EC; Standardization Mandates: M/561. 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.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.LNRYHJDAußenluft - Messverfahren zur Bestimmung der Konzentration von Stickstoffdioxid und Stickstoffmonoxid mit ChemilumineszenzAir ambiant - Méthode normalisée pour le mesurage de la concentration en dioxyde d'azote et monoxyde d'azote par chimiluminescenceAmbient air - Standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by chemiluminescence13.040.20Kakovost okoljskega zrakaAmbient atmospheresICS:Ta slovenski standard je istoveten z:EN 14211:2012SIST EN 14211:2012en,fr,de01-december-2012SIST EN 14211:2012SLOVENSKI
STANDARDSIST EN 14211:20051DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14211
August 2012 ICS 13.040.20 Supersedes EN 14211:2005English Version
Ambient air - Standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by chemiluminescence
Air ambiant - Méthode normalisée pour le mesurage de la concentration en dioxyde d'azote et monoxyde d'azote par chimiluminescence
Luftqualität - Messverfahren zur Bestimmung der Konzentration von Stickstoffdioxid und Stickstoffmonoxid mit Chemilumineszenz This European Standard was approved by CEN on 10 May 2012.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14211:2012: ESIST EN 14211:2012
Test of lack of fit . 53Annex B (informative)
Sampling equipment. 55Annex C (informative)
Types of chemiluminescence analysers . 57Annex D (informative)
Manifold testing . 60Annex E (normative)
Type approval . 62Annex F (informative)
Calculation of uncertainty in field operation at the hourly limit value . 81Annex G (informative)
Calculation of uncertainty in field operation at the annual limit value . 89Annex H (informative)
Significant technical changes . 99Bibliography . 100 SIST EN 14211:2012
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14211:2012
NOTE 2 When this European Standard is used for other purposes than for measurements required by Directive 2008/50/EC, the ranges and uncertainty requirements may not apply. The method covers the determination of ambient air concentrations of nitrogen dioxide and nitrogen monoxide in zones classified as rural areas, urban-background areas and traffic-orientated locations and locations influenced by industrial sources.
The results are expressed in µg/m3 (at 20 °C and 101,3 kPa). NOTE 3 500 µg/m3 of NO2 corresponds to 261 nmol/mol of NO2 at 20 °C and 101,3 kPa. 1 200 µg/m3 of NO corresponds to 962 nmol/mol of NO 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 NOx measurement by chemiluminescence analyser and sampling equipment. Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of NOx 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 NOx 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 NOx 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 14211:2012
(ISO 6144) EN ISO 6145-6, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 6: Critical orifices (ISO 6145-6) EN ISO 6145-7, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 7: Thermal mass-flow controllers (ISO 6145-7) EN ISO 6145-10, Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 10: Permeation method (ISO 6145-10)
EN ISO 14956, Air quality — Evaluation of the suitability of a measurement procedure by comparison with a required measurement uncertainty (ISO 14956) EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
(ISO/IEC 17025) ENV 13005:1999, Guide to the expression of uncertainty in measurement 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 adjustment 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. [SOURCE: JCGM 200:2012 (VIM) [2]] Note 3 to entry:
In the context of this standard, adjustment is generally performed on measurement data rather than on the analyser. SIST EN 14211:2012
[SOURCE: Council Directive 2008/50/EC [1]]
3.3 analyser measuring system that provides an output signal which is a function of the concentration, partial pressure, flow or temperature of one or more components of a gas mixture 3.4 availability of the analyser fraction of the time period for which valid measuring data of the ambient air concentration is available from an analyser
3.5 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 to entry: A calibration may be expressed by a statement, calibration function, calibration diagram, calibration curve, or calibration table. In some cases, it may consist of an additive or multiplicative correction of the indication with associated measurement uncertainty. Note 2 to entry: Calibration should not be confused with adjustment of a measuring system, often mistakenly called “self-calibration”, nor with verification of a calibration. Note 3 to entry: Often, the first step alone in the above definition is perceived as being calibration. [SOURCE: JCGM 200:2012 (VIM) [2]] Note 4 to entry: In the context of this standard, calibration is a comparison of the analyser response to a known gas concentration with a known uncertainty when the information obtained from the comparison is used for the successive adjustment (if needed) of the analyser. 3.6 certification range concentration range for which the analyser is type-approved 3.7 check verification that the analyser is still operating within specified performance limits
3.8 combined standard uncertainty standard uncertainty of the result of a measurement when that result is obtained from the values of a number of other quantities, equal to the positive square root of a sum of terms, the terms being the variances or co-variances of these other quantities weighted according to how the measurement result varies with changes in these quantities
[SOURCE: ENV 13005:1999]
3.9 converter efficiency degree of conversion of NO2 present in the sample gas into NO, given as a percentage SIST EN 14211:2012
[SOURCE: ENV 13005:1999]
3.11 designated body body which has been designated for a specific task (type approval tests and/or QA/QC activities in the field) by the competent authority in the Member States 3.12 detection limit smallest concentration of a measurand that can be reliably detected by a specific measurement process
Note 1 to entry: The detection limit is calculated as 3,3 x (sz/B) where sz is the standard deviation of analyser response at zero measurand concentration (see 8.4.5) and B is the slope of the calibration function [3]. 3.13 expanded uncertainty quantity defining an interval about the result of a measurement that may be expected to encompass a large fraction of the distribution of values that could reasonably be attributed to the measurand
Note 1 to entry:
The fraction may be viewed as the coverage probability or level of confidence of the interval. Note 2 to entry:
To associate a specific level of confidence with the interval defined by the expanded uncertainty requires explicit or implicit assumptions regarding the probability distribution characterised by the measurement result and its combined standard uncertainty. The level of confidence that may be attributed to this interval can be known only to the extent to which such assumptions may be justified. [SOURCE: ENV 13005:1999] Note 3 to entry: For the purpose of this standard, the expanded uncertainty is the combined standard uncertainty multiplied by a coverage factor k=2 resulting in an interval with a level of confidence of 95 %. 3.14 fall time difference between the response time (fall) and the lag time (fall) 3.15 independent measurement individual measurement that is not influenced by a previous individual measurement by separating two individual measurements by at least four response times Note 1 to entry: The largest value of response time (rise) and response time (fall) are intended. 3.16 individual measurement measurement averaged over a time period equal to the response time of the analyser Note 1 to entry: The largest value of response time (rise) and response time (fall) are intended.
Note 2 to entry: This definition differs from the meaning of the concept “individual measurement” in Directive 2008/50/EC [1]. 3.17 influence quantity quantity that is not the measurand but that affects the result of the measurement
[SOURCE: ENV 13005:1999] SIST EN 14211:2012
3.20 lag time time interval from the moment at which a step change of sample concentration occurs at the inlet of the analyser to the moment at which the output reading reaches a level corresponding to a predefined change of the stable output reading 3.21 limit value level fixed on the basis of scientific knowledge, with the aim of avoiding, preventing or reducing harmful effects on human health and/or the environment as a whole, to be attained within a given period and not to be exceeded once attained [SOURCE: Council Directive 2008/50/EC [1]] 3.22 long term drift difference between zero or span readings over a determined period of time (e.g. period of unattended operation) 3.23 monitoring station enclosure located in the field in which an analyser has been installed to monitor concentrations of one or more ambient air pollutants
3.24 parallel measurements measurements from different analysers, sampling from one and the same sampling manifold, starting at the same time and ending at the same time 3.25 performance characteristic one of the parameters assigned to equipment in order to define its performance 3.26 performance criterion limiting quantitative numerical value assigned to a performance characteristic, to which conformance is tested 3.27 period of unattended operation time period over which the drift complies with the performance criterion for long term drift 3.28 repeatability (of results of measurement) closeness of the agreement between the results of successive individual measurements of nitrogen monoxide and nitrogen dioxide carried out under the same conditions of measurement Note 1 to entry: These conditions include: a) the same measurement procedure; b) the same observer; c) the same analyser, used under the same conditions; d) at the same location; e) repetition over a short period of time. SIST EN 14211:2012
Note 1 to entry: The term "gas" may refer to a test gas used in type-approval testing or to ambient air transferred to the analyser. 3.35 sampling system the assembly of components needed to transfer ambient air to the analyser 3.36 short-term drift difference between zero or span readings at the beginning and end of a 12 h period 3.37 standard uncertainty uncertainty of the result of a measurement expressed as a standard deviation
[SOURCE: ENV 13005:1999] 3.38 surrounding temperature temperature of the air directly surrounding the analyser 3.39 total residence time sum of the residence time in the sampling system and the residence time inside the analyser 3.40 type approval decision taken by a designated body that the pattern of an analyser conforms to specified requirements
FEP
perfluoro-ethylene-propylene MFC mass flow controller PTFE polytetrafluoroethylene 5 Principle 5.1 General This standard describes the method for measurement of the concentrations of nitrogen dioxide and nitrogen monoxide in ambient air by means of chemiluminescence. The requirements, the specific components of the chemiluminescence analyser and its sampling system are described. A number of performance characteristics with associated minimum performance criteria are given for the analyser. The actual values of these performance characteristics for a specific type of analyser shall be determined in a so-called type approval test for which procedures have been described. The type approval test comprises a laboratory test and a field test. The selection of a type-approved analyser for a specific measuring task in the field is based on the calculation of the expanded uncertainty of the measurement method. In this expanded uncertainty calculation, the actual values of various performance characteristics of a type-approved analyser and the site-specific conditions at the monitoring station are taken into account (see 9.6). The expanded uncertainty of the method shall not exceed 15% for fixed measurements or 25 % for indicative measurements, as specified in Annex I of Directive 2008/50/EC [1]. Requirements and recommendations for quality assurance and quality control are given for the measurements in the field (see 9.4). 5.2 Measuring principle Chemiluminescence is based on the reaction of nitrogen monoxide with ozone. In a chemiluminescence analyser, air is sampled through a filter (to prevent contamination of the gas conveying system, especially the optical components of the analyser) and fed at a constant flow rate into the reaction chamber of the analyser, where it is mixed with an excess of ozone for the determination of nitrogen monoxide only. The emitted radiation (chemiluminescence) is proportional to the number of nitrogen monoxide molecules in the detection volume and thus proportional to the concentration of nitrogen monoxide. The emitted radiation is filtered by a selective optical filter and converted into an electric signal by a photomultiplier tube or a photodiode. For the determination of nitrogen dioxide, the sampled air is fed through a converter where the nitrogen dioxide is reduced to nitrogen monoxide and analysed in the same way as previously described. The electrical signal obtained from the photomultiplier tube or photodiode is proportional to the sum of concentrations of nitrogen dioxide and nitrogen monoxide. The amount of nitrogen dioxide is calculated from the difference between this concentration and that obtained for nitrogen monoxide only (when the sampled air has not passed through the converter). Chemiluminescence is the emission of light during a chemical reaction. During the gas-phase reaction of NO and ozone light with an intensity proportional to the concentration of NO is produced when electrons of the excited NO2 molecules decay to lower energy states. SIST EN 14211:2012
The material of the sample inlet as well as the sampling line or manifold can influence the composition of the sample. In practice, the best materials, such as polytetrafluoroethylene (PTFE), perfluoro-ethylene-propylene (FEP), borosilicate glass or stainless steel, shall be used. The influence of the material of the sampling inlet and line or manifold on the measured concentrations of nitrogen monoxide and nitrogen dioxide due to losses shall be
< 2,0 %.
The sampling line or manifold may be moderately heated to avoid condensation. Condensation may occur in the case of high ambient temperature and/or humidity. The influence of the pressure drop along the sampling inlet and line or manifold and the particle filter on the measured concentrations shall be ≤ 1,0 %. 6.3.2 Particle filter A particle filter shall be placed between the sampling line or manifold and the inlet of the analyser. The filter shall retain all particles likely to alter the performance of the analyser. It shall be made of PTFE. The material of the filter housing shall be chemically inert to nitrogen monoxide and nitrogen dioxide. NOTE 1 The filter may be internal to the analyser (see 7.9) or external. In case the analyser contains a built-in filter, an external filter is not necessary. NOTE 2 A pore size of the filter of 5 µm usually fulfils this requirement. NOTE 3 Suitable materials for the filter housing are for example PTFE, stainless steel, or borosilicate glass.
The particle filter shall be conditioned before used in measurements. The filter shall be changed periodically depending on the dust loading at the sampling site (as indicated in 9.7). The filter housing shall be cleaned at least every six months. Overloading of the filter may cause loss of nitrogen dioxide by adsorption on the particle matter and may increase the pressure drop in the sampling line. 6.3.3 Formation of NO2 and loss of NO
As O3 is generally present in the sampled air, a change in concentrations of NO and NO2 will occur due to the reaction of NO with O3 in the sampling inlet and line or manifold, and in the analyser. In practice a significant change in the concentrations of NO and NO2 may be avoided when the residence time in the sampling system is
≤ 3 s. The requirement for the residence time in the analyser is ≤ 3 s (see Table 1). The residence time shall be evaluated for the NO channel. It is not necessary to evaluate the residence time for the NOx channel (in which the converter is present) as all the NO2 is converted to NO in the converter. Consequently, the total residence time in the sampling system plus analyser shall comply with the performance criterion in Table 1.
Depending on the location of the particle filter, the sampling system can be contaminated by deposition of dust. This can induce losses of NO2.The sampling system shall be cleaned (as stated in 9.4.1) with a frequency which is dependent on the site-specific conditions. 6.3.4 Conditioning The sampling system and the particle filter shall be conditioned (at initial installation and after each cleaning) to avoid temporary decreases in the measured NO and NO2 concentrations by sampling ambient air for a period of at least 30 min at the nominal sample flow rate. Conditioning may also be done in the laboratory before installation. These conditioning periods shall not be included in the calculation of the availability of the analyser during the type approval test (see 8.5.7). NOTE Conditioning during field operation is considered a part of normal maintenance. Consequently, the concentrations measured during conditioning need not be included in the calculation of data capture, and hourly and annual averages. 6.4 Control and regulation of sample flow rate The sample flow rate into the analyser shall be maintained within the specifications of the manufacturer of the analyser.
The influence of the pressure drop induced by the manifold sampling pump on the measured concentration shall be ≤ 1,0 %. 7 Analyser equipment 7.1 General Generally, three types of analysers are available, those with: a) two reaction chambers and one common photo multiplier or photodiode; b) two reaction chambers each with a separate photo multiplier or photodiode;
c) one reaction chamber (with one photo multiplier or photodiode). In Types a) and b) the airflow is divided into two streams, one passing directly to one of the reaction chambers for measurement of the nitrogen monoxide content. The other stream is fed through the converter for conversion of the nitrogen dioxide to nitrogen monoxide and then to the other reaction chamber for measurement of the total content of nitrogen dioxide and nitrogen monoxide. In the Type c) analyser, the air sample alternately bypasses or passes through the converter. This type of analyser measures during a certain time period the amount of nitrogen monoxide and during the next time period the sum of nitrogen dioxide and nitrogen monoxide concentrations. NOTE 1 Schematic diagrams of typical analysers are given in Figure C.1 and Figure C.2 (Types a) and b)) and Figure C.3 (Type c)). NOTE 2 Some Type c) analysers do not fulfil the requirements for use at traffic-orientated locations, due to the rapid fluctuations of the nitrogen dioxide and nitrogen monoxide concentrations. These rapid fluctuations may result in erroneous determination of the NO2 concentrations, as these are the result of the subtraction of two consecutive readings (NOx and NO). The use of a delay loop reduces this problem. The averaging error is quantified in the type approval test.
A chemiluminescence analyser consists of the principal components which are described in 7.2 to 7.8. 7.2 Converter The converter converts nitrogen dioxide in the sampled air into nitrogen monoxide.
Most converters use a heated furnace maintained at a constant temperature and are made of materials such as stainless steel, copper, molybdenum, tungsten or spectroscopically pure carbon. Other types are available, for example those based on photolysis of nitrogen dioxide. The converter shall be capable of converting at least 95 % of the nitrogen dioxide to nitrogen monoxide. The conversion efficiency shall be checked according to 8.4.14. A mathematical correction for the NO2 concentration shall be made when the converter efficiency is < 98 %.
NOTE Heated-furnace converters are not specific for nitrogen dioxide but also convert other components such as nitric acid, nitrous acid, ammonia and PAN to nitrogen monoxide. This may be particularly relevant for rural sites. Photolytic converters are sp
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The EN 14211:2012 standard provides a comprehensive framework for the continuous measurement of nitrogen dioxide (NO2) and nitrogen monoxide (NO) concentrations in ambient air using the chemiluminescence method. Its scope is well-defined, addressing a critical aspect of air quality monitoring and control, including the performance characteristics necessary for choosing an appropriate chemiluminescence analyser based on established type approval tests. A notable strength of this standard lies in its applicability across various environmental contexts, from rural areas to urban and traffic-influenced locations, making it relevant for diverse monitoring needs. Moreover, it sets specific certification ranges-up to 500 µg/m3 for nitrogen dioxide and 1,200 µg/m3 for nitrogen monoxide-providing a clear framework for measurement that is consistent with regulatory requirements such as those outlined in Directive 2008/50/EC. The inclusion of detailed clauses that outline procedures for type-approval testing, analyser performance requirements, and ongoing quality assurance emphasizes the standard's thoroughness and commitment to data quality. The information provided for different user groups enhances its accessibility and usability, making it easier for test houses, laboratories, and monitoring networks to implement effective and reliable measurement practices. Additionally, the method's emphasis on evaluating uncertainty in measurement results adds significant value, as it directly addresses the complexities associated with ambient air quality measurement. Overall, the EN 14211:2012 standard stands as a crucial and significant document in the realm of air quality monitoring, ensuring that the measurement of nitrogen dioxide and nitrogen monoxide is performed accurately and consistently across various environments.
SIST EN 14211:2012は、環境空気中の二酸化窒素（NO2）および一酸化窒素（NO）の濃度を化学発光法により測定するための欧州標準であり、そのスコープは非常に明確です。この標準は、周囲の空気におけるNO2およびNOの連続測定方法を規定しており、測定原理としての化学発光法に基づいています。また、適切な化学発光分析計を選択するための最低基準や性能特性についても説明しています。 この標準の強みは、特定の固定サイトでの分析計の適合性を評価するための詳細なガイドラインを提供している点です。具体的には、2008/50/EC指令の附属書Iに記載されたデータの質に関する要件を満たすように設計されています。このため、環境空気中のNO2の濃度測定において最大500 µg/m3、NOにおいては最大1,200 µg/m3という認証範囲を設けており、実務における信頼性を保証します。 さらに、SIST EN 14211:2012は、農村地域、都市背景地域、交通集約地域、産業影響を受ける場所といった様々な地域でのNOx濃度測定に適用可能です。これは、多様な環境条件下での環境モニタリングにおいて非常に重要な要素です。測定結果は20°Cおよび101.3 kPaでµg/m3で表現され、結果の解釈に必要な情報が明確にされています。 また、標準の各条項（第5条から第11条、および附属書BからG）には、化学発光分析計によるNOx測定の原理、型式承認試験の条件や手順、性能要件、測定結果の不確かさ評価など、異なるユーザーグループに向けた有用な情報が網羅されています。特に、型式承認試験を実施する試験機関や研究所、NOxの実務的測定を行うモニタリングネットワークに向けた情報が豊富であり、実際の運用においても非常に役立ちます。 SIST EN 14211:2012は、環境空気の質を監視し効果的に管理するための基盤を提供するものであり、化学発光法を用いたNOxの測定における国際的な整合性と標準化の重要性を強調しています。これは、データの質を保証し、適切な健康政策や環境対策を構築するために不可欠な仕様と言えるでしょう。
표준 EN 14211:2012는 대기 중 이산화질소(NO2) 및 일산화질소(NO) 농도를 측정하기 위한 화학발광 방법을 규정하고 있습니다. 이 표준의 범위는 지속적인 측정 방법으로, 대기 중 이산화질소와 일산화질소의 농도를 정량적으로 분석할 수 있도록 설계되었습니다. 이는 특히 2008/50/EC 지침에 명시된 데이터 품질 요구 사항을 충족하기 위해 필수적입니다. 이 표준의 강점 중 하나는 다양한 환경 요인에 대한 적응성과 포괄성입니다. 농촌, 도시 배경, 교통 지향 지역 및 산업 영향 지역 등 다각적인 환경에서 NO2 및 NO 농도를 측정할 수 있는 방법을 제공합니다. 주의해야 할 점은 이 표준이 500 µg/m³까지의 NO2와 1,200 µg/m³까지의 NO 농도를 위한 인증 범위를 설정한다는 것입니다. 또한, 본 표준은 측정 기구의 성능 특성 및 적합성을 평가하는 데 필요한 최소 기준을 마련하고 있습니다. 특히, 5조에서 7조 및 부록 B와 C는 화학발광 분석기를 사용한 NOx 측정의 원리에 대한 일반 정보를 포함하고 있어 사용자에게 유용한 지침을 제공합니다. 8조 및 부록 E는 NOx 분석기의 타입 승인 테스트를 수행하는 테스트 하우스 및 실험실에 초점을 맞추어, 테스트 조건, 절차 및 성능 요구 사항 등을 상세히 설명함으로써 정확하고 신뢰할 수 있는 분석 결과를 보장합니다. 마지막으로, 9조에서 11조 및 부록 F와 G는 대기 중 NOx의 실질적인 측정을 수행하는 모니터링 네트워크에 대한 정보를 제공하며, 분석기의 초기 설치, 품질 보증 및 측정 결과 보고 방식 등에 관한 지침을 포함하고 있습니다. 종합적으로, EN 14211:2012 표준은 대기 오염 측정의 신뢰성을 높이고, 다양한 환경에서의 NOx 농도 측정을 위한 체계적인 접근 방식을 제공함으로써 환경 관리에 중요한 기여를 하고 있습니다.
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