CEN/TS 16976:2016
(Main)Ambient air - Determination of the particle number concentration of atmospheric aerosol
Ambient air - Determination of the particle number concentration of atmospheric aerosol
This Technical Specification describes a standard method for determining the particle number concentration in ambient air in a range up to about 107 cm–3 for averaging times equal to or larger than 1 min. The standard method is based on a Condensation Particle Counter (CPC) operated in the counting mode and an appropriate dilution system for concentrations exceeding the counting mode range. It also defines the performance characteristics and the minimum requirements of the instruments to be used. The lower and upper sizes considered within this document are 7 nm and a few micrometres, respectively. This document describes sampling, operation, data processing and QA/QC procedures including calibration parameters.
Außenluft - Bestimmung der Partikelanzahlkonzentration des atmosphärischen Aerosols
Diese Technische Spezifikation stellt ein Standardverfahren zur Bestimmung der Partikelanzahl-konzentration in Außenluft im Bereich bis etwa 107 cm−3 für Mittelungszeiten von mindestens 1 min auf. Das Standardverfahren basiert auf einem im Zählmodus betriebenen Kondensationspartikelzähler (en: condensation particle counter, CPC), gegebenenfalls mit geeignetem Verdünnungssystem, falls die Konzentrationen den Bereich des Zählmodus überschreiten. Weiterhin werden Leistungskenngrößen und Mindestanforderungen für die zu verwendenden Geräte definiert. Der betrachtete Partikelgrößenbereich reicht von 7 nm bis zu einigen Mikrometern. Diese Technische Spezifikation beschreibt Probenahme, Betrieb des Geräts, Datenverarbeitung und QA/QC-Maßnahmen, einschließlich der Kalibrierparameter.
Air ambiant - Détermination de la concentration en nombre de particules de l'aérosol atmosphérique
La présente Spécification technique décrit une méthode normalisée de détermination de la concentration en nombre de particules dans l’air ambiant sur une plage allant jusqu’à environ 107 cm-3, pour des durées de calcul des moyennes supérieures ou égales à 1 min. La méthode normalisée repose sur un compteur de particules à noyaux de condensation (CPC) fonctionnant en mode comptage et sur un système de dilution approprié pour les concentrations excédant la plage du mode comptage. Elle définit également les caractéristiques de performance et les exigences minimales relatives aux instruments à utiliser. Les tailles de particules minimale et maximale considérées dans le présent document sont, respectivement, de 7 nm et quelques micromètres. Le présent document décrit le prélèvement, le fonctionnement, le traitement des données et les procédures d’assurance qualité et de contrôle qualité, y compris les paramètres d’étalonnage.
Zunanji zrak - Določevanje številčne koncentracije delcev atmosferskih aerosolov
Ta dokument opisuje standardno metodo za določevanje številčne koncentracije delcev v zunanjem zraku na območju do približno 10 na kvadrat 7 cm-3 za čase povprečenja, ki so dolgi največ 1 minuto. Standardna metoda temelji na kondenzacijskem števcu delcev (CPC), ki deluje v načinu štetja, in ustreznem sistemu redčenja za koncentracije, ki presegajo obseg načina štetja. Določa tudi lastnosti zmogljivosti in minimalne zahteve instrumentov, ki jih je treba uporabiti. Spodnje in zgornje velikosti, obravnavane tem dokumentu, so 7 nm in nekaj mikrometrov. Ta dokument opisuje vzorčenje, delovanje, obdelavo podatkov ter postopke zagotavljanja in nadzora kakovosti, vključno z umerjanjem.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2017
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Ambient air - Determination of the particle number concentration of atmospheric aerosol
Außenluft - Bestimmung der Partikelanzahlkonzentration des atmosphärischen Aerosols
Air ambiant - Détermination de la concentration en nombre de particules de l'aérosol
atmosphérique
Ta slovenski standard je istoveten z: CEN/TS 16976:2016
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN/TS 16976
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
August 2016
TECHNISCHE SPEZIFIKATION
ICS 13.040.20
English Version
Ambient air - Determination of the particle number
concentration of atmospheric aerosol
Air ambiant - Détermination de la concentration en Außenluft - Bestimmung der
nombre de particules de l'aérosol atmosphérique Partikelanzahlkonzentration des atmosphärischen
Aerosols
This Technical Specification (CEN/TS) was approved by CEN on 26 June 2016 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.
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
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16976:2016 E
worldwide for CEN national Members.
Contents Page
European Foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Atmospheric aerosol . 8
5 Description of the method . 9
5.1 Sampling and conditioning . 9
5.1.1 Sampling . 9
5.1.2 Drying . 10
5.1.3 Dilution . 11
5.2 Determination of the number concentration with a CPC . 11
5.2.1 Condensation growth . 11
5.2.2 Optical detection . 13
6 CPC performance criteria and test procedures . 14
6.1 General . 14
6.2 General requirements of the CPC . 14
6.3 Test conditions . 15
6.4 Performance characteristics and criteria . 15
6.5 Test procedures . 16
6.5.1 Inlet flow rate accuracy . 16
6.5.2 Number concentration measurement range . 16
6.5.3 Number concentration detection limit . 16
6.5.4 Linearity and slope of response . 16
6.5.5 Detection efficiency curve at low particle size . 17
6.5.6 Upper particle size detection limit . 17
6.5.7 Zero count rate . 17
6.5.8 Response time . 17
6.5.9 Dependence of flow rate on supply voltage . 17
6.5.10 Accuracy of temperature and pressure sensor calibration . 18
6.5.11 Effect of failure of mains voltage . 18
7 Performance criteria and test procedures for the sampling and conditioning system . 18
7.1 General requirements . 18
7.2 Performance characteristics and criteria . 18
7.3 Diffusion losses . 19
7.4 Relative humidity . 19
7.5 Dilution factor . 19
7.6 Primary sampling flow . 19
8 Measurement procedure . 20
8.1 Measurement planning . 20
8.2 Environmental operating conditions . 20
8.3 Initial installation . 20
8.4 Initial checks on site. 20
8.5 Data processing and reporting . 21
9 Quality control, quality assurance and measurement uncertainty . 21
9.1 General. 21
9.2 Frequency of calibrations, checks and maintenance . 21
9.2.1 General. 21
9.2.2 Maintenance of CPC . 22
9.2.3 Calibration of CPC plateau region and linearity . 22
9.2.4 Determination of CPC low size cut-off . 22
9.2.5 CPC zero check . 22
9.2.6 Number concentration check . 23
9.2.7 CPC flow rate calibration . 23
9.2.8 Temperature and pressure sensor calibration . 23
9.2.9 CPC internal diagnostics . 23
9.2.10 Sample system maintenance . 23
9.2.11 Relative humidity sensor . 23
9.2.12 Dilution factor (where applicable) . 23
9.2.13 Leak check . 23
9.3 Measurement uncertainty . 24
9.3.1 General. 24
9.3.2 CPC plateau detection efficiency . 24
9.3.3 CPC detection efficiency drift. 24
9.3.4 Flow determination . 25
9.3.5 Correction to standard temperature and pressure . 25
9.3.6 Sampling losses due to diffusion to walls . 25
9.3.7 Dilution factor (where applicable) . 25
9.3.8 Calculation of overall uncertainty . 25
Annex A (normative) Determination of diffusion losses in sampling lines . 27
Annex B (informative) Example of the calculation of diffusion losses in a sampling system . 29
B.1 Description of the sampling system . 29
B.2 Air properties and diffusion coefficient . 30
B.3 Losses in the primary sampling tube . 30
B.4 Losses in the secondary sampling tube and the dryer . 31
B.5 Overall sampling losses . 31
Annex C (informative) Data reporting . 32
C.1 Motivation . 32
C.2 Level 0 (annotated raw data) .
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