Stationary source emissions - Determination of mass concentration of nitrogen oxides - Standard reference method: chemiluminescence

This European Standard specifies the standard reference method (SRM) based on the chemiluminescence principle for the determination of the nitrogen oxides (NOx) in flue gases emitted to the atmosphere from ducts and stacks. It includes the sampling and the gas conditioning system, as well as the analyser.
This European Standard specifies the characteristics to be determined and the performance criteria to be fulfilled by measuring systems based on this measurement method. It applies for periodic monitoring and for the calibration or control of automatic measuring systems (AMS) permanently installed on a stack, for regulatory or other purposes.
This European Standard specifies criteria for demonstration of equivalence of an alternative method to the SRM by application of prEN 14793.
This European standard has been validated during field tests on waste incineration, co-incineration and large combustion installations and on a recognized test-bench. It has been validated for sampling periods of 30 min in the range of 0 mg/m3 to 1 300 mg/m3 of NO2 for large combustion plants and 0 mg/m3 to 400 mg/m3 of NO2 for waste incineration, according to emission limit values (ELV) laid down in the Directive 2010/75/EC.
The ELV for NOx (NO + NO2) in EU directives are expressed in mg/m3 of NO2 on a dry basis, at a specified value for oxygen and at reference conditions (273 K and 101,3 kPa).
NOTE    The characteristics of installations, the conditions during field tests and the values of repeatability and reproducibility in the field are given in Annex F.

Emissionen aus stationären Quellen - Bestimmung der Massenkonzentration von Stickstoffoxiden - Standardreferenzverfahren: Chemilumineszenz

Diese Europäische Norm legt das Standardreferenzverfahren (SRM) auf Basis des Chemilumineszenz-Verfahrens zur Bestimmung der Stickstoffoxide (NOx) in Abgasen, die aus Abgaskanälen in die Atmosphäre emittiert werden, fest. Es beinhaltet die Einrichtungen zur Probenahme und zur Probengasaufbereitung sowie das Analysegerät.
Diese Europäische Norm legt zu bestimmende Verfahrenskenngrößen und Mindestanforderungen fest, die von portablen automatischen Messeinrichtungen (P AMS) auf Basis dieses Messverfahrens eingehalten werden müssen. Sie gilt für wiederkehrende Messungen und für die Kalibrierung oder Überprüfung von automatischen Messeinrichtungen (AMS), die aus gesetzgeberischen oder anderen Gründen stationär an einem Abgaskanal installiert sind.
Diese Europäische Norm legt Anforderungen zum Nachweis der Gleichwertigkeit von Alternativverfahren (AM) mit dem Standardreferenzverfahren (SRM) durch Anwendung der EN 14793:2017 fest.
Diese Europäische Norm wurde in Feldversuchen an Abfallverbrennungsanlagen, Mitverbrennungsanlagen und Großfeuerungsanlagen sowie an einem anerkannten Prüfstand validiert. Sie wurde mit Probenahmedauern von 30 min für NOx-Konzentrationen im Bereich von 0 mg/m3 bis 1 300 mg/m3 für Großfeuerungsanlagen und im Bereich von 0 mg/m3 bis 400 mg/m3 für Abfallverbrennungsanlagen, jeweils gemessen als NO2, entsprechend den in der Richtlinie 2010/75/EU geforderten Emissionsgrenzwerten (ELV) validiert.
In den EU-Richtlinien wird der Grenzwert für NOx (NO + NO2) gemessen als NO2 in Milligramm je Kubikmeter (mg/m3) für trockenes Gas bei einem Bezugssauerstoffgehalt und Normbedingungen (273 K und 101,3 kPa) angegeben.
ANMERKUNG   Die Einzelheiten der Anlagen, die Bedingungen bei den Feldversuchen und die Werte der Wiederhol- und der Vergleichpräzision im Feld werden in Anhang A aufgeführt.

Emissions de sources fixes - Détermination de la concentration massique des oxydes d'azote - Méthode de référence normalisée : chimiluminescence

La présente Norme européenne spécifie la méthode de référence normalisée (SRM) basée sur le principe de chimiluminescence pour la détermination des oxydes d'azote (NOx) des effluents gazeux émis dans l'atmosphère par les conduits et cheminées. Elle inclut le système de prélèvement et de conditionnement du gaz ainsi que l'analyseur.
La présente Norme européenne spécifie les caractéristiques devant être déterminées et les critères de performance devant être remplis par les systèmes de mesurage fondés sur cette méthode de mesurage. Elle s'applique à la surveillance périodique et à l'étalonnage ou au contrôle des systèmes de mesurage automatisés (AMS, Automatic Measuring Systems) installés à demeure sur une cheminée, à des fins réglementaires ou à d'autres fins.
La présente Norme européenne spécifie les critères permettant de démontrer l'équivalence entre une méthode « alternative » et la méthode de référence normalisée par l'application du prEN 14793.
La présente Norme européenne a été validée au cours d'essais sur site pratiqués sur des installations destinées à l'incinération des déchets, à la coincinération et sur de grandes installations de combustion ainsi que sur un banc d'essai reconnu. Elle a été validée pour des périodes de prélèvement de 30 min, dans la gamme comprise entre 0 mg/m3 et 2 000 mg/m3 de NO2 pour de grandes installations de combustion et entre 0 mg/m3 à 400 mg/m3 of NO2 pour l'incinération des déchets, conformément aux valeurs limites d'émission (VLE) spécifiées dans la Directive 2010/75/CE.
Les VLE des Directives UE pour NOx (NO + NO2) sont exprimées en mg/m3 de NO2 sur sec, à une valeur spécifiée de l'oxygène et dans les conditions de référence (273 K et 101,3 kPa).
NOTE   Les caractéristiques des installations, les conditions des essais sur site et les valeurs de répétabilité et de reproductibilité sur site sont indiquées à l'Annexe F.

Emisije nepremičnih virov - Določevanje masne koncentracije dušikovih oksidov - Standardna referenčna metoda: kemiluminiscenca

Ta evropski standard določa standardno referenčno metodo (SRM) na podlagi kemoluminiscence za določanje dušikovih oksidov (NOx) v dimnih plinih, ki prehajajo v ozračje iz vodov in odvodnikov. Vključuje sistem za vzorčenje in kondicioniranje plinov ter tudi analizator.
Ta evropski standard določa lastnosti in merila zmogljivosti, ki jih morajo izpolnjevati merilni sistemi na podlagi te merilne metode. Uporablja se za redno spremljanje in kalibracijo ali nadzor avtomatskih merilnih sistemov (AMS), ki so trajno nameščeni na odvodnik, in sicer za zakonske ter druge namene.
Ta evropski standard določa merila za prikaz enakovrednosti alternativne metode standardni referenčni metodi z uporabo standarda prEN 14793.
Ta evropski standard je bil potrjen med preskusi sežiganja odpadkov, sosežiga in velikih kurilnih naprav na terenu ter na ustrezni preskusni mizi. Potrjen je bil za 30-minutna obdobja vzorčenja v razponu od 0 mg/m3 do 1300 mg/m3 NO2 za velike kurilne naprave in od 0 mg/m3 do 400 mg/m3 NO2 za sežig odpadkov glede na mejne vrednosti emisij (ELV), opredeljene v Direktivi 2010/75/ES.
Mejne vrednosti emisij za NOx (NO + NO2) v direktivah EU so izražene v mg/m3 NO2 na suhi osnovi pri podani vrednosti kisika in referenčnih pogojih (273 K in 101,3 kPa).
OPOMBA: Lastnosti naprav, pogoji med preskusi na terenu ter vrednosti ponovljivosti in reprodukcije na terenu so podani v dodatku F.

General Information

Status
Published
Publication Date
10-Jan-2017
Technical Committee
Drafting Committee
Current Stage
9020 - Submission to 2 Year Review Enquiry - Review Enquiry
Due Date
15-Apr-2022
Completion Date
15-Apr-2022

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Emissionen aus stationären Quellen - Bestimmung der Massenkonzentration von Stickstoffoxiden - Standardreferenzverfahren: ChemilumineszenzEmissions de sources fixes - Détermination de la concentration massique des oxydes d'azote - Méthode de référence normalisée : chimiluminescenceStationary source emissions - Determination of mass concentration of nitrogen oxides - Standard reference method: chemiluminescence13.040.40Stationary source emissionsICS:Ta slovenski standard je istoveten z:EN 14792:2017SIST EN 14792:2017en,fr,de01-marec-2017SIST EN 14792:2017SLOVENSKI

STANDARDSIST EN 14792:20061DGRPHãþD
SIST EN 14792:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14792
January
t r s y ICS
s uä r v rä v r Supersedes EN
s v y { tã t r r wEnglish Version

Stationary source emissions æ Determination of mass concentration of nitrogen oxides æ Standard reference methodã chemiluminescence Emissions de sources fixes æ Détermination de la concentration massique des oxydes d 5azote æ Méthode de référence normalisée ã chimiluminescence

Emissionen aus stationären Quellen æ Bestimmung der Massenkonzentration von Stickstoffoxiden æ Standardreferenzverfahrenã Chemilumineszenz This European Standard was approved by CEN on

t x September
t r s xä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s v y { tã t r s y ESIST EN 14792:2017
EN 14792:2017 (E) 2 Contents Page

European foreword ....................................................................................................................................................... 5 1 Scope .................................................................................................................................................................... 6 2 Normative references .................................................................................................................................... 6 3 Terms and definitions ................................................................................................................................... 7 4 Symbols and abbreviations ...................................................................................................................... 13 4.1 Symbols ............................................................................................................................................................ 13 4.2 Abbreviated terms ....................................................................................................................................... 14 5 Principle .......................................................................................................................................................... 14 5.1 General ............................................................................................................................................................. 14 5.2 Measuring principle .................................................................................................................................... 14 6 Description of the measuring system ................................................................................................... 15 6.1 General ............................................................................................................................................................. 15 6.2 Sampling and sample gas conditioning system ................................................................................. 16 6.2.1 Sampling probe ............................................................................................................................................. 16 6.2.2 Filter .................................................................................................................................................................. 17 6.2.3 Sample gas line .............................................................................................................................................. 17 6.2.4 Sample gas conditioning system ............................................................................................................. 17 6.2.5 Sample gas pump .......................................................................................................................................... 18 6.2.6 Secondary filter ............................................................................................................................................. 18 6.2.7 Flow controller and flow meter .............................................................................................................. 18 6.3 Analyser equipment .................................................................................................................................... 18 6.3.1 General ............................................................................................................................................................. 18 6.3.2 Converter ........................................................................................................................................................ 19 6.3.3 Ozone generator ........................................................................................................................................... 19 6.3.4 Reaction chamber ........................................................................................................................................ 19 6.3.5 Optical filter ................................................................................................................................................... 19 6.3.6 Photomultiplier tube .................................................................................................................................. 20 6.3.7 Ozone removal .............................................................................................................................................. 20 7 Performance characteristics of the SRM .............................................................................................. 20 8 Suitability of the measuring system to the measurement task ................................................... 21 9 Field operation .............................................................................................................................................. 22 9.1 Measurement planning .............................................................................................................................. 22 9.2 Sampling strategy......................................................................................................................................... 22 9.2.1 General ............................................................................................................................................................. 22 9.2.2 Measurement section and measurement plane ................................................................................ 22 9.2.3 Minimum number and location of measurement points ............................................................... 22 9.2.4 Measurement ports and working platform ........................................................................................ 22 9.3 Choice of the measuring system ............................................................................................................. 23 9.4 Setting of the measuring system on site .............................................................................................. 23 9.4.1 General ............................................................................................................................................................. 23 9.4.2 Preliminary zero and span check, and adjustments ....................................................................... 23 9.4.3 Zero and span checks after measurement .......................................................................................... 24 SIST EN 14792:2017

EN 14792:2017 (E) 3 10 Ongoing quality control .............................................................................................................................. 25 10.1 General ............................................................................................................................................................. 25 10.2 Frequency of checks .................................................................................................................................... 25 11 Expression of results ................................................................................................................................... 26 12 Equivalence of an alternative method .................................................................................................. 27 13 Measurement report ................................................................................................................................... 27 Annex A (informative)

Validation of the method in the field ..................................................................... 28 A.1 General ............................................................................................................................................................. 28 A.2 Characteristics of installations ................................................................................................................ 28 A.3 Repeatability and reproducibility in the field .................................................................................... 29 A.3.1 General ............................................................................................................................................................. 29 A.3.2 Repeatability .................................................................................................................................................. 30 A.3.3 Reproducibility .............................................................................................................................................. 31 Annex B (informative)

Sampling and conditioning configurations ......................................................... 32 Annex C (normative)

Determination of conversion efficiency ................................................................. 33 C.1 General ............................................................................................................................................................. 33 C.2 First method: cylinder gases for calibration ....................................................................................... 33 C.3 Second method: gaseous phase titration ............................................................................................. 33 Annex D (informative)

Examples of different types of converters ......................................................... 35 D.1 Quartz converter ........................................................................................................................................... 35 D.2 Low temperature converter (molybdenum) ...................................................................................... 35 D.3 Stainless steel converter ............................................................................................................................ 35 Annex E (informative)

Calculation of the uncertainty associated with a concentration expressed for dry gas and at an oxygen reference concentration .............................................. 36 E.1 Uncertainty associated with a concentration expressed on dry gas .......................................... 36 E.2 Uncertainty associated with a concentration expressed at a oxygen reference concentration ................................................................................................................................................. 38 Annex F (informative)

Example of assessment of compliance of chemiluminescence method for NOx with requirements on emission measurements ................................................................ 40 F.1 General ............................................................................................................................................................. 40 F.2 Elements required for the uncertainty determinations ................................................................. 40 F.2.1 Model equation .............................................................................................................................................. 40 F.2.2 Combined uncertainty ................................................................................................................................ 41 F.2.3 Expanded uncertainty ................................................................................................................................. 41 F.2.4 Determination of uncertainty contributions in case of rectangular distributions ............... 43 F.2.5 Determination of uncertainty contributions by use of sensitivity coefficients ..................... 44 F.3 Example of an uncertainty calculation.................................................................................................. 44 F.3.1 Site specific conditions ............................................................................................................................... 44 SIST EN 14792:2017

EN 14792:2017 (E) 4 F.3.2 Performance characteristics of the method ....................................................................................... 45 F.3.3 Calculation of concentration values ...................................................................................................... 46 F.3.4 Determination of the uncertainty contributions .............................................................................. 47 F.3.5 Result of uncertainty calculation ........................................................................................................... 50 F.3.5.1 Standard uncertainties .............................................................................................................................. 50 F.3.5.2 Combined uncertainty ................................................................................................................................ 51 F.3.5.3 Expanded uncertainty ................................................................................................................................ 52 F.3.5.4 Evaluation of the compliance with the required measurement quality .................................. 52 Annex G (informative) Example of correction of data from drift effect ................................................. 53 Annex H (informative)

Significant technical changes .................................................................................. 55 Bibliography ................................................................................................................................................................. 56

SIST EN 14792:2017

EN 14792:2017 (E) 5 European foreword This document (EN 14792:2017) has been prepared by Technical Committee CEN/TC 264 “Air quality”, the secretariat of which is held by DIN. This document supersedes EN 14792:2005. 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 July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017. 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. Annex H provides details of significant technical changes between this document and the previous edition. According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14792:2017

EN 14792:2017 (E) 6 1 Scope This European Standard specifies the standard reference method (SRM) based on the chemiluminescence principle for the determination of the nitrogen oxides (NOx) in flue gases emitted to the atmosphere from ducts and stacks. It includes the sampling and the gas conditioning system, as well as the analyser.

This European Standard specifies the characteristics to be determined and the performance criteria to be fulfilled by portable automated measuring systems (P-AMS) based on this measurement method. It applies for periodic monitoring and for the calibration or control of automated measuring systems (AMS) permanently installed on a stack, for regulatory or other purposes.

This European Standard specifies criteria for demonstration of equivalence of an alternative method to the SRM by application of EN 14793:2017. This European Standard has been validated during field tests on waste incineration, co-incineration and large combustion installations and on a recognized test-bench. It has been validated for sampling periods of 30 min in the range of 0 mg/m3 to 1 300 mg/m3 of NOx for large combustion plants and 0 mg/m3 to 400 mg/m3 of NOx for waste incineration, according to emission limit values (ELV) laid down in the Directive 2010/75/EU. The ELV for NOx (NO + NO2) in EU Directives is expressed in mg/m3 of NO2 on a dry basis, at a specified value for oxygen and at standard conditions (273 K and 101,3 kPa). NOTE The characteristics of installations, the conditions during field tests and the values of repeatability and reproducibility in the field are given in Annex A. 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 14793:2017, Stationary source emission – Demonstration of equivalence of an alternative method with a reference method EN 15259:2007, Air quality - Measurement of stationary source emissions - Requirements for measurement sections and sites and for the measurement objective, plan and report EN 15267-4:2017, Air quality — Certification of automated measuring systems — Part 4: Performance criteria and test procedures for automated measuring systems for periodic measurements of emissions from stationary sources EN ISO 14956:2002, Air quality - Evaluation of the suitability of a measurement procedure by comparison with a required measurement uncertainty (ISO 14956:2002) ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) SIST EN 14792:2017

EN 14792:2017 (E) 7 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE In this European Standard, NOx is defined as the sum of NO and NO2. The mass concentration of NOx is expressed as the equivalent NO2 concentration in milligrams per cubic metre at standard conditions. 3.1 standard reference method

SRM reference method prescribed by European or national legislation

[SOURCE: EN 15259:2007] 3.2 reference method RM measurement method taken as a reference by convention, which gives the accepted reference value of the measurand Note 1 to entry: A reference method is fully described. Note 2 to entry: A reference method can be a manual or an automated method. Note 3 to entry: Alternative methods can be used if equivalence to the reference method has been demonstrated. [SOURCE: EN 15259:2007] 3.3 measurement method method described in a written procedure containing all the means and procedures required to sample and analyse, namely: field of application, principle and/or reactions, definitions, equipment, procedures, presentation of results, and other requirements and measurement report [SOURCE: EN 14793:2017] 3.4 alternative method

measurement method which complies with the criteria given by this European Standard with respect to the reference method

Note 1 to entry: An alternative method can consist of a simplification of the reference method. [SOURCE: EN 14793:2017] 3.5 measuring system set of one or more measuring instruments and often other devices, including any reagent and supply, assembled and adapted to give information used to generate measured quantity values within specified intervals for quantities of specified kinds [SOURCE: JCGM 200:2012] SIST EN 14792:2017

EN 14792:2017 (E) 8 3.6 automated measuring system AMS entirety of all measuring instruments and additional devices for obtaining a result of measurement Note 1 to entry: Apart from the actual measuring device (the analyser), an AMS includes facilities for taking samples (e.g. probe, sample gas lines, flow meters and regulator, delivery pump) and for sample conditioning (e.g. dust filter, pre-separator for interferents, cooler, converter). This definition also includes testing and adjusting devices that are required for functional checks and, if applicable, for commissioning. Note 2 to entry: The term “automated measuring system” (AMS) is typically used in Europe. The term “continuous emission monitoring system” (CEMS) is also typically used in the UK and USA. [SOURCE: EN 15267-4:2017] 3.7 portable automated measuring system P-AMS automated measuring system which is in a condition or application to be moved from one to another measurement site to obtain measurement results for a short period Note 1 to entry: The measurement period is typically 8 h for a day.

Note 2 to entry: The P-AMS can be configured at the measurement site for the special application but can be also set-up in a van or mobile container. The probe and the sample gas lines are installed often just before the measurement task is started.

[SOURCE: EN 15267-4:2017] 3.8 calibration

set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring method or measuring system, and the corresponding values given by the applicable reference

Note 1 to entry: In case of automated measuring system (AMS) permanently installed on a stack the applicable reference is the standard reference method (SRM) used to establish the calibration function of the AMS. Note 2 to entry: Calibration should not be confused with adjustment of a measuring system. 3.9 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: The adjustment can be made directly on the instrument or using a suitable calculation procedure. 3.10 span gas test gas used to adjust and check a specific point on the response line of the measuring system SIST EN 14792:2017

EN 14792:2017 (E) 9 3.11 measurand particular quantity subject to measurement
[SOURCE: EN 15259:2007] Note 1 to entry:

The measurand is a quantifiable property of the stack gas under test, for example mass concentration of a measured component, temperature, velocity, mass flow, oxygen content and water vapour content. 3.12 interference negative or positive effect upon the response of the measuring system, due to a component of the sample that is not the measurand 3.13 influence quantity quantity that is not the measurand but that affects the result of the measurement Note 1 to entry: Influence quantities are e.g. presence of interfering gases; ambient temperature, pressure of the gas sample. 3.14 ambient temperature

temperature of the air around the measuring device 3.15 emission limit value ELV limit value given in regulations such as EU Directives, ordinances, administrative regulations, permits, licences, authorisations or consents Note 1 to entry: ELV can be stated as concentration limits expressed as half-hourly, hourly and daily averaged values, or mass flow limits expressed as hourly, daily, weekly, monthly or annually aggregated values. 3.16 measurement site place on the waste gas duct in the area of the measurement plane(s) consisting of structures and technical equipment, for example working platforms, measurement ports, energy supply

Note 1 to entry: Measurement site is also known as sampling site. [SOURCE: EN 15259:2007] 3.17 measurement plane plane normal to the centreline of the duct at the sampling position Note 1 to entry: Measurement plane is also known as sampling plane. [SOURCE: EN 15259:2007] SIST EN 14792:2017

EN 14792:2017 (E) 10 3.18 measurement port opening in the waste gas duct along the measurement line, through which access to the waste gas is gained Note 1 to entry: Measurement port is also known as sampling port or access port. [SOURCE: EN 15259:2007] 3.19 measurement line line in the measurement plane along which the measurement points are located, bounded by the inner duct wall Note 1 to entry: Measurement line is also known as sampling line. [SOURCE: EN 15259:2007] 3.20 measurement point position in the measurement plane at which the sample stream is extracted or the measurement data are obtained directly

Note 1 to entry: Measurement point is also known as sampling point. [SOURCE: EN 15259:2007] 3.21 performance characteristic one of the quantities (described by values, tolerances, range) assigned to equipment in order to define its performance 3.22 response time duration between the instant when an input quantity value of a measuring instrument or measuring system is subjected to an abrupt change between two specified constant quantity values and the instant when a corresponding indication settles within specified limits around its final steady value

Note 1 to entry: By convention time taken for the output signal to pass from 0 % to 90 % of the final variation of indication. 3.23 short-term zero drift difference between two zero readings at the beginning and at the end of the measurement period 3.24 short-term span drift difference between two span readings at the beginning and at the end of the measurement period SIST EN 14792:2017

EN 14792:2017 (E) 11 3.25 lack of fit systematic deviation, within the measurement range, between the measurement result obtained by applying the calibration function to the observed response of the measuring system measuring test gases and the corresponding accepted value of such test gases Note 1 to entry: Lack of fit can be a function of the measurement result. Note 2 to entry: The expression “lack of fit” is often replaced in everyday language by “linearity” or “deviation from linearity”. 3.26 repeatability in the laboratory closeness of the agreement between the results of successive measurements of the same measurand carried out under the same conditions of measurement Note 1 to entry: Repeatability conditions include: — same measurement method; — same laboratory; — same measuring system, used under the same conditions; — same location; — repetition over a short period of time. Note 2 to entry: Repeatability may be expressed quantitatively in terms of the dispersion characteristics of the results. Note 3 to entry: In this European Standard the repeatability is expressed as a value with a level of confidence of 95 %. SIST EN 14792:2017

EN 14792:2017 (E) 12 3.27 repeatability in the field closeness of the agreement between the results of simultaneous measurements of the same measurand carried out with two sets of equipment under the same conditions of measurement Note 1 to entry: These conditions include: — same measurement method; — two sets of equipment, the performance of which fulfils the requirements of the measurement method,

used under the same conditions; — same location; — implemented by the same laboratory; — typically calculated on short periods of time in order to avoid the effect of changes of influence

parameters (e.g. 30 min). Note 2 to entry: Repeatability may be expressed quantitatively in terms of the dispersion characteristics of the results. Note 3 to entry: In this European Standard the repeatability under field conditions is expressed as a value with a level of confidence of 95 %. 3.28 reproducibility in the field

closeness of the agreement between the results of simultaneous measurements of the same measurand carried out using several sets of equipment under the same conditions of measu

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