oSIST prEN 14212:2022
(Main)Ambient air - Standard method for the measurement of the concentration of sulphur dioxide by ultraviolet fluorescence
Ambient air - Standard method for the measurement of the concentration of sulphur dioxide by ultraviolet fluorescence
This European Standard specifies a continuous measurement method for the determination of the concentration of sulphur dioxide present in ambient air based on the ultraviolet fluorescence measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate ultraviolet fluorescence 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 mass concentration of sulphur dioxide present in ambient air up to 1000 μg/m3. This concentration range represents the certification range for SO2 for the type approval test.
NOTE 1 Other ranges may be used depending on the levels present in ambient air.
NOTE 2 When the 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 sulphur dioxide 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 1 000 μg/m3 of SO2 corresponds to 376 nmol/mol of SO2.
This standard contains information for different groups of users.
Clauses 5 to 7 and Annexes C and D contain general information about the principles of sulphur dioxide
measurement by ultraviolet fluorescence analyser and sampling equipment.
Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type-approval testing of sulphur dioxide 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 sulphur dioxide 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 sulphur dioxide 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 Schwefeldioxid mit Ultraviolett-Fluoreszenz
Dieses Dokument legt ein kontinuierliches Ultraviolett-Fluoreszenz-Messverfahren zur Bestimmung der Konzentration von Schwefeldioxid in Luft fest. Dieses Dokument nennt die Leistungskenngrößen und legt die Mindestanforderungen für die Eignungsprüfung von Ultraviolett-Fluoreszenz-Messgeräten fest. Es beinhaltet auch die Bewertung der Eignung eines Messgeräts für den Einsatz an einem bestimmten ortsfesten Messstandort bezüglich der Anforderungen an die Datenqualität nach Anhang I der Richtlinie 2008/50/EG [1] und bezüglich der Anforderungen für Probennahme, Kalibrierung und Qualitätssicherung.
Das Verfahren ist anwendbar zur Bestimmung der Massenkonzentration von Schwefeldioxid in Luft im Bereich bis 1 000 µg/m3. Dieser Konzentrationsbereich entspricht dem Zertifizierungsbereich für Schwefeldioxid für die Eignungsprüfung.
ANMERKUNG 1 Je nach Konzentrationsniveau in der Luft können auch andere Bereiche gewählt werden.
ANMERKUNG 2 Wird dieses Dokument für andere Zwecke als für Messungen nach Richtlinie 2008/50/EG eingesetzt, dann brauchen die Anforderungen hinsichtlich Anwendungsbereich und Unsicherheit nicht zur Geltung kommen.
Das Verfahren umfasst die Bestimmung der Konzentration von Schwefeldioxid an Standorten, die als ländlich, städtischer Hintergrund, verkehrsbezogen und für Probenahmen unter dem Einfluss von Verkehr oder industrielle Quellen klassifiziert sind.
Die Ergebnisse werden in µg/m3 (bei 20 °C und 101,3 kPa) angegeben.
ANMERKUNG 3 1 000 µg/m3 von SO2 entsprechen 376 nmol/mol SO2.
Dieses Dokument enthält Informationen für verschiedene Nutzergruppen.
Abschnitt 5 bis Abschnitt 7 und Anhang B und Anhang C enthalten allgemeine Informationen über die Grundlagen der Schwefeldioxid-Messung mit einem Ultraviolett-Fluoreszenz-Messgerät sowie über die Probennahmeeinrichtung.
Abschnitt 8 und Anhang E richten sich speziell an Prüfinstitute und -laboratorien, die Eignungsprüfungen von Schwefeldioxid-Messgeräten durchführen. Diese Abschnitte enthalten Informationen über
— Prüfbedingungen, -verfahren und -anforderungen bei der Eignungsprüfung;
— Anforderungen an die Leistungsfähigkeit des Messgeräts;
— die Bewertung der Ergebnisse der Eignungsprüfung;
— die Bewertung der Unsicherheit der Messergebnisse des Schwefeldioxid-Messgeräts anhand der Eignungsprüfungsergebnisse.
Abschnitt 9 bis Abschnitt 11 und Anhang F und Anhang G richten sich an die Betreiber von Messnetzen, mit denen Schwefeldioxid-Messungen in Luft durchgeführt werden. Diese Abschnitte enthalten Informationen über
— die Erstinstallation des Messgeräts im Messnetz und Eignungsbewertung;
— die laufende Qualitätssicherung und -kontrolle;
— die Berechnung und Übermittlung der Messergebnisse;
— die Bewertung der Unsicherheit der Messergebnisse unter Messbedingungen.
Das vorliegende Dokument stellt eine Weiterentwicklung der vorangegangenen Ausgaben (EN 14212:2005 und EN 14212:2012) dar. Es wird empfohlen, dass bei der Beschaffung von Geräten diese vollständig mit diesem Dokument übereinstimmen.
ANMERKUNG 4 Eignungsprüfungen, die vor der Veröffentlichung dieses Dokuments zum Zweck des Nachweises der Gleichwertigkeit durchgeführt wurden, sind weiterhin gültig.
ANMERKUNG 5 Eignungsprüfungen von Messgeräten, die vor der Veröffentlichung dieses Dokuments durchgeführt wurden, bleiben weiterhin für die Verwendung für regulierte Beobachtungszwecke gültig.
Air ambiant - Méthode normalisée pour le mesurage de la concentration en dioxyde de soufre par fluorescence U.V.
Le présent document spécifie une méthode de mesure en continu pour la détermination de la concentration en dioxyde de soufre dans l’air ambiant, selon le principe de mesure par fluorescence U.V. Le présent document décrit les caractéristiques de performance et fixe les critères minimaux requis pour sélectionner un analyseur par fluorescence U.V. à l’aide d’essais de type. Il présente également l’évaluation de l’aptitude d’un analyseur sur un site fixe spécifique de manière à répondre aux exigences de qualité des données spécifiées à 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 massique en dioxyde de soufre présent dans l’air ambiant jusqu’à 1 000 µg/m3. Cette plage de concentration représente l’étendue de mesure certifiée en dioxyde de soufre pour les essais de type.
NOTE 1 D’autres plages peuvent être utilisées selon les niveaux présents dans l’air ambiant.
NOTE 2 Lorsque le présent document est utilisé à d’autres fins que les mesurages requis par 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 de soufre présent dans l’air ambiant dans les emplacements classés comme zones rurales, urbaines, et le prélèvement influencé par la circulation ou les sources industrielles.
Les résultats sont exprimés en µg/m3 (à 20 °C et 101,3 kPa).
NOTE 3 1 000 µg/m3 de SO2 correspondent à 376 nmol/mol de SO2.
Le présent document contient des informations pour différents groupes d’utilisateurs.
Les Articles 5 à 7 et les Annexes C et D contiennent des informations générales relatives aux principes de mesure du dioxyde de soufre à l’aide d’un analyseur par fluorescence U.V. et d’un équipement de prélèvement.
L’Article 8 et l’Annexe E concernent tout particulièrement les organismes et les laboratoires d’essai qui effectuent des essais de type des analyseurs de dioxyde de soufre. Ces sections contiennent des informations concernant :
les conditions des essais de type, les modes opératoires d’essai et les exigences d’essai ;
les exigences de performance de l’analyseur ;
l’évaluation des résultats des essais de type ;
l’évaluation de l’incertitude des résultats de mesure de l’analyseur de dioxyde de soufre d’après les résultats des essais de type.
Les Articles 9 à 11 et les Annexes F et G concernent les réseaux de surveillance effectuant les mesurages en conditions réelles du dioxyde de soufre dans l’air ambiant. Ces sections contiennent des informations concernant :
l’installation initiale de l’analyseur dans le réseau de surveillance et l’essai de réception ;
l’assurance qualité / le contrôle qualité en continu ;
le calcul et le compte-rendu des résultats de mesure ;
l’évaluation de l’incertitude des résultats de mesure sous des conditions de surveillance réelles.
Le présent document représente une évolution par rapport aux éditions antérieures (EN 14212:2005 et EN 14212:2012). Il est conseillé que l’équipement acheté soit parfaitement conforme au présent document.
NOTE 4 Les essais de type effectués avant la publication du présent document afin de démontrer l’équivalence restent valables.
NOTE 5 L’utilisation des analyseurs soumis aux essais de type avant la publication du présent document reste valable à des fins de surveillance réglementée.
Zunanji zrak - Standardna metoda za določanje koncentracije žveplovega dioksida z ultravijolično fluorescenco
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 14212:2022
01-december-2022
Zunanji zrak - Standardna metoda za določanje koncentracije žveplovega dioksida
z ultravijolično fluorescenco
Ambient air - Standard method for the measurement of the concentration of sulphur
dioxide by ultraviolet fluorescence
Außenluft - Messverfahren zur Bestimmung der Konzentration von Schwefeldioxid mit
Ultraviolett-Fluoreszenz
Air ambiant - Méthode normalisée pour le mesurage de la concentration en dioxyde de
soufre par fluorescence U.V.
Ta slovenski standard je istoveten z: prEN 14212
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
oSIST prEN 14212:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14212:2022
DRAFT
EUROPEAN STANDARD
prEN 14212
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2022
ICS 13.040.20 Will supersede EN 14212:2012
English Version
Ambient air - Standard method for the measurement of the
concentration of sulphur dioxide by ultraviolet
fluorescence
Air ambiant - Méthode normalisée pour le mesurage de Außenluft - Messverfahren zur Bestimmung der
la concentration en dioxyde de soufre par fluorescence Konzentration von Schwefeldioxid mit Ultraviolett-
U.V. Fluoreszenz
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 264.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14212:2022 E
worldwide for CEN national Members.
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Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Abbreviated terms . 12
5 Principle . 12
5.1 General . 12
5.2 Measuring principle . 12
5.3 Type testing . 13
5.4 Field operation and quality control. 13
6 Sampling . 14
6.1 General . 14
6.2 Sampling location . 14
6.3 Sampling system . 14
6.4 Control and regulation of sample flow rate . 16
6.5 Sampling pump for the manifold . 16
7 Analyser equipment . 16
7.1 General . 16
7.2 Selective traps for interfering agents . 16
7.3 Optical assembly. 16
7.4 Pressure measurement . 17
7.5 Flow rate indicator . 17
7.6 Sampling pump for the analyser . 17
7.7 Internal sulfur dioxide span source . 17
7.8 Particle filter . 17
8 Type testing of ultraviolet fluorescence sulfur dioxide analysers . 17
8.1 General . 17
8.2 Relevant performance characteristics and performance criteria. 18
8.3 Design change . 21
8.4 Procedure for determination of the performance characteristics during
the laboratory test . 21
8.5 Determination of the performance characteristics during the field test. 34
8.6 Type testing and uncertainty calculation . 37
9 Field operation and ongoing quality control . 38
9.1 General . 38
9.2 Suitability evaluation . 38
9.3 Initial installation . 40
9.4 Ongoing quality assurance/quality control . 41
9.5 Calibration of the analyser . 45
9.6 Checks . 46
9.7 Maintenance . 51
9.8 Data handling and data reports . 51
9.9 Measurement uncertainty . 52
10 Expression of results . 52
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11 Test reports and documentation . 52
11.1 Type testing . 52
11.2 Field operation . 54
A.1 Establishment of the regression line . 55
A.2 Calculation of the residuals of the averages . 55
E.1 Type testing and uncertainty calculation . 62
E.2 Type testing Requirement a) . 62
E.3 Type testing Requirement b). 64
E.4 Type testing Requirement c) . 76
E.5 Type testing Requirement d). 76
F.1 General . 83
F.2 Combined standard uncertainty . 83
F.3 Standard uncertainties . 84
F.4 Example calculation . 90
G.1 General . 92
G.2 Combined standard uncertainty . 92
G.3 Standard uncertainties . 93
G.4 Example calculation . 102
H.1 General . 104
I.1 General . 105
J.1 Details of significant technical changes between this document and the previous
edition . 107
Bibliography . 108
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European foreword
This document (prEN 14212:2022) has been prepared by Technical Committee CEN/TC 264 “Air quality”,
the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14212:2012.
The technical modifications in comparison with the previous edition are listed in Annex J
of this document.
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1 Scope
This document specifies a continuous measurement method for the determination of the concentration
of sulfur dioxide present in ambient air based on the ultraviolet fluorescence measuring principle. This
document describes the performance characteristics and sets the relevant minimum criteria required to
select an appropriate ultraviolet fluorescence analyser by means of type testing. 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 mass concentration of sulphur dioxide present
3
in ambient air up to 1000 µg/m . This concentration range represents the certification range for sulfur
dioxide for type testing.
NOTE 1 It is possible to use other ranges depending on the levels present in ambient air.
NOTE 2 When this document is used for purposes other than for measurements required by
Directive 2008/50/EC, the ranges and uncertainty requirements possibly do not apply.
The method covers the determination of ambient air concentrations of sulfur dioxide in locations
classified as rural areas, urban-background areas, and for sampling influenced by traffic or industrial
sources.
3
The results are expressed in µg/m (at 20 °C and 101,3 kPa).
3
NOTE 3 1 000 µg/m of SO corresponds to 376 nmol/mol of SO .
2 2
This document contains information for different groups of users.
Clause 5 to Clause 7 and Annex C and Annex D contain general information about the principles of sulfur
dioxide measurement by ultraviolet fluorescence analyser and sampling equipment.
Clause 8 and Annex E are specifically directed towards test houses and laboratories that perform type
testing of sulfur dioxide analysers. These sections contain information about:
— type testing conditions, test procedures and test requirements;
— analyser performance requirements;
— evaluation of the type testing results;
— evaluation of the uncertainty of the measurement results of the sulfur dioxide analyser based
on the type testing results.
Clause 9 to Clause 11 and Annex F and Annex G are directed towards monitoring networks performing
the practical measurements of sulfur dioxide 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 the measurement results under practical monitoring conditions.
This document represents an evolution of earlier editions (EN 14212:2005 and EN 14212:2012).
It is advisable that when equipment is procured it complies fully with this document.
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NOTE 4 Type testing performed prior to the publication of this document for the purpose of demonstrating
equivalence are still valid.
NOTE 5 Analysers type tested prior to the publication of this document remain valid for use for regulated
monitoring purposes.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any amendments)
applies.
EN 15267-1, Air quality - 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 method (ISO 6144)
EN ISO 6145-6, Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 6:
Critical flow orifices (ISO 6145-6)
EN ISO 6145-7, Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 7:
Thermal mass-flow controllers (ISO 6145-7)
EN ISO 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)
ISO 19229, Gas analysis - Purity analysis and the treatment of purity data
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
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3.1
adjustment
adjustment of a measuring system
set of operations carried out on a measuring system so that it provides prescribed indications
corresponding to given values of a quantity to be measured
Note 1 to entry: Types of adjustment of a measuring system include zero adjustment of a measuring system,
offset adjustment, and span adjustment (sometimes called gain adjustment).
Note 2 to entry: Adjustment of a measuring system should not be confused with calibration, which is a
prerequisite for adjustment.
Note 3 to entry: In the context of this document, adjustment is generally performed on measurement data rather
than on the analyser.
[SOURCE: JCGM 200:2012, 3.11 [2]]
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.
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Note 4 to entry: In the context of this document, 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.
[SOURCE: JCGM 200:2012, 2.39 [2]]
3.6
certification range
concentration range for which the analyser is type tested
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: JCGM 100:2008, 2.3.4 [3]
3.9
coverage factor
numerical factor used as a multiplier of the combined standard uncertainty in order to obtain
an expanded uncertainty
[SOURCE: JCGM 100:2008, 2.3.6 [3]
3.10
designated body
body which has been designated for a specific task (type testing and/or QA/QC activities in the field)
by the competent authority in the Member States
3.11
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 × (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 [4].
3.12
expanded uncertainty
quantity defining an interval about the result of a measurement that can 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 characterized 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.
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Note 3 to entry: For the purpose of this document, 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 %.
[SOURCE: JCGM 100:2008, 2.3.5 [3]
3.13
fall time
difference between the response time (fall) and the lag time (fall)
3.14
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.
3.15
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].
3.16
influence quantity
quantity that is not the measurand but that affects the result of the measurement
[SOURCE: JCGM 100:2008, B.2.10] [3]
3.17
interferent
component of the air sample, excluding the measured constituent, that affects the output signal
3.18
lack of fit
maximum deviation from the linear regression line of the average of a series of measurement results
at the same concentration
3.19
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
3.20
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]]
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3.21
long-term drift
difference between zero or span readings over a determined period of time (e.g. period of unattended
operation)
3.22
monitoring station
enclosure located in the field in which an analyser has been installed to monitor concentrations of one
or more ambient air pollutants
3.23
parallel measurement
measurement from different analysers, sampling from one and the same sampling manifold starting
at the same time and ending at the same time
3.24
performance characteristic
one of the parameters assigned to equipment in order to define its performance
3.25
performance criterion
limiting quantitative numerical value assigned to a performance characteristic, to which conformance
is tested
3.26
period of unattended operation
time period over which the drift complies with the performance criterion for long term drift
3.27
repeatability (of results of measurement)
closeness of the agreement between the results of successive individual measurements of sulfur 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.
3.28
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;
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c) at the same monitoring station;
d) the period of unattended operation.
3.29
residence time inside the analyser
time period for the sampled air to be transported from the inlet of the analyser to the reaction chamber
3.30
residence time in the sampling system
time period for the sampled air to be transferred to the inlet of the analyser
3.31
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
3.32
sampled air
part of ambient air that is transferred through the sampling inlet and sampling system for subsequent
measurement
3.33
sample gas temperature
temperature of the sampled gas at the sample inlet
Note 1 to entry: The term “gas” can refer to a test gas used in type testing or to ambient air transferred to the
analyser.
3.34
sampling system
assembly of components needed to transfer ambient air to the analyser
3.35
short-term drift
difference between zero or span readings at the beginning and end of a 12 h period
3.36
standard uncertainty
uncertainty of the result of a measurement expressed as a standard deviation
[SOURCE: JCGM 100:2008, 2.3.1 [3]
3.37
surrounding temperature
temperature of the air directly surrounding the analyser
3.38
total residence time
sum of the residence time in the sampling sy
...
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