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
Published
Public Enquiry End Date
19-May-2010
Publication Date
13-Nov-2012
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Oct-2012
Due Date
21-Dec-2012
Completion Date
14-Nov-2012

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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
SIST EN 14211:2012
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

EN 14211:2012 (E) 2 Contents Contents ....................................................................................................................................................................... 2Foreword ...................................................................................................................................................................... 41Scope .............................................................................................................................................................. 52Normative references .................................................................................................................................... 63Terms and definitions .................................................................................................................................... 64Abbreviated terms ....................................................................................................................................... 115Principle ........................................................................................................................................................ 115.1General .......................................................................................................................................................... 115.2Measuring principle ..................................................................................................................................... 115.3Type approval test ....................................................................................................................................... 125.4Field operation and quality control ............................................................................................................ 126Sampling ....................................................................................................................................................... 136.1General .......................................................................................................................................................... 136.2Sampling location ........................................................................................................................................ 136.3Sampling system.......................................................................................................................................... 136.4Control and regulation of sample flow rate ............................................................................................... 146.5Sampling pump for the manifold ................................................................................................................ 157Analyser equipment ..................................................................................................................................... 157.1General .......................................................................................................................................................... 157.2Converter ...................................................................................................................................................... 157.3Ozone generator........................................................................................................................................... 167.4Reaction chamber ........................................................................................................................................ 167.5Optical filter .................................................................................................................................................. 167.6Detector ......................................................................................................................................................... 167.7Ozone removal device ................................................................................................................................. 167.8Sampling pump for the analyser ................................................................................................................ 167.9Particle filter ................................................................................................................................................. 168Type approval of nitrogen dioxide and nitrogen monoxide analysers .................................................. 168.1General .......................................................................................................................................................... 168.2Relevant performance characteristics and performance criteria ........................................................... 178.3Design change.............................................................................................................................................. 198.4Procedures for determination of the performance characteristics during the laboratory test ........... 208.5Determination of the performance characteristics during the field test ................................................ 328.6Type approval and uncertainty calculation ............................................................................................... 359Field operation and ongoing quality control ............................................................................................. 369.1General .......................................................................................................................................................... 369.2Suitability evaluation ................................................................................................................................... 369.3Initial installation .......................................................................................................................................... 389.4Ongoing quality assurance/quality control ............................................................................................... 399.5Calibration of the analyser .......................................................................................................................... 419.6Checks .......................................................................................................................................................... 439.7Maintenance ................................................................................................................................................. 489.8Data handling and data reports .................................................................................................................. 489.9Measurement uncertainty ........................................................................................................................... 4910Expression of results .................................................................................................................................. 4911Test reports and documentation ................................................................................................................ 5011.1Type approval test ....................................................................................................................................... 5011.2Field operation ............................................................................................................................................. 51SIST EN 14211:2012

EN 14211:2012 (E) 3 Annex A (normative)

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

EN 14211:2012 (E) 4 Foreword This document (EN 14211:2012) 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 February 2013, and conflicting national standards shall be withdrawn at the latest by February 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14211:2005. The technical changes made since EN 14211:2005 are listed in Annex H of this European Standard.

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

EN 14211:2012 (E) 5 1 Scope 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. SIST EN 14211:2012

EN 14211:2012 (E) 6 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 — Certification of automated measuring systems — Part 1: General principles EN 15267-2, Air quality — Certification of automated measuring systems — Part 2: Initial assessment of the AMS manufacturer’s quality management system and post certification surveillance for the manufacturing process EN ISO 6142, Gas analysis — Preparation of calibration gas mixtures — Gravimetric method (ISO 6142) EN ISO 6143, Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures (ISO 6143) EN ISO 6144, Gas analysis — Preparation of calibration gas mixtures — Static volumetric methods

(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

EN 14211:2012 (E) 7 3.2 ambient air outdoor air in the troposphere, excluding workplaces as defined by Directive 89/654/EEC, where provisions concerning health and safety at work apply and to which members of the public do not have regular access

[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

EN 14211:2012 (E) 8 3.10 coverage factor numerical factor used as a multiplier of the combined standard uncertainty in order to obtain an expanded uncertainty

[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

EN 14211:2012 (E) 9 3.18 interferent component of the air sample, excluding the measured constituent, that affects the output signal 3.19 lack of fit maximum deviation from the linear regression line of the average of a series of measurement results at the same concentration

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

EN 14211:2012 (E) 10 3.29 reproducibility under field conditions closeness of the agreement between the results of simultaneous measurements with two analysers in ambient air carried out under the same conditions of measurement Note 1 to entry: These conditions are called field reproducibility conditions and include: a) the same measurement procedure; b) two identical analysers, used under the same conditions; c) at the same monitoring station; d) the period of unattended operation. 3.30 residence time inside the analyser time period for the sampled air to be transported from the inlet of the analyser to the reaction chamber for the NO-channel 3.31 residence time in the sampling system time period for the sampled air to be transferred to the inlet of the analyser 3.32 response time time interval from the instant at which a step change of sample concentration occurs at the inlet of the analyser to the instant at which the output reading reaches a level corresponding to a predefined change of the output reading 3.33 sampled air part of ambient air that is transferred through the sampling inlet and sampling system for subsequent measurement 3.34 sample gas temperature temperature of the sampled gas at the sample inlet

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

SIST EN 14211:2012

EN 14211:2012 (E) 11 3.41 type approval test examination of two or more analysers of the same pattern which are submitted by a manufacturer to a designated body including the tests necessary for approval of the pattern 3.42 uncertainty (of measurement) parameter associated with the result of a measurement that characterises the dispersion of the values that could reasonably be attributed to the measurand [SOURCE: ENV 13005:1999] 4 Abbreviated terms

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

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