CEN/TS 17434:2020
(Main)Ambient air - Determination of the particle number size distribution of atmospheric aerosol using a Mobility Particle Size Spectrometer (MPSS)
Ambient air - Determination of the particle number size distribution of atmospheric aerosol using a Mobility Particle Size Spectrometer (MPSS)
This document describes a standard method for determining particle number size distributions in ambient air in the size range from 10 nm to 800 nm at total concentrations up to approximately 10^5 cm^-3 with a time resolution of a few minutes. The standard method is based on a Mobility Particle Size Spectrometer (MPSS) used with a bipolar diffusion charger and a Condensation Particle Counter (CPC) as the detector. The document describes the performance characteristics and minimum requirements of the instruments and equipment to be used, and describes sampling, operation, data processing and QA/QC procedures, including calibration.
Außenluft - Bestimmung der Partikelanzahlgrößenverteilung des atmosphärischen Aerosols mit einem Mobilitäts-Partikelgrößenspektrometer (MPSS)
Dieses Dokument beschreibt ein Standardverfahren zur Ermittlung von Partikelanzahlgrößenverteilungen in Außenluft im Größenbereich von 10 nm bis 800 nm bei Gesamtkonzentrationen bis etwa 10^5 cm^−3 mit einer zeitlichen Auflösung von wenigen Minuten. Das Standardverfahren beruht auf einem Mobilitäts-Partikelgrößen¬spektrometer (MPSS), das mit einem bipolaren Diffusionsauflader sowie einem Kondensations¬partikelzähler (CPC) als Detektor betrieben wird. Dieses Dokument legt die Leistungskenngrößen und Mindestanforderungen an zu verwendende Geräte und Ausrüstung fest und beschreibt Probenahme, Betrieb, Datenverarbeitung und QA/QC Maßnahmen, einschließlich Kalibrierung.
Air ambiant - Détermination de la distribution granulométrique de particules d’un aérosol atmosphérique à l’aide d’un spectromètre de granulométrie à mobilité électrique (MPSS)
Le présent document décrit une méthode normalisée de détermination des distributions granulométriques de particules dans l’air ambiant dans la gamme de tailles allant de 10 nm à 800 nm à des concentrations totales allant jusqu’à environ 10^5 cm^-3 avec une résolution temporelle de quelques minutes. La méthode normalisée repose sur un spectromètre de granulométrie à mobilité électrique (MPSS) associé à un chargeur à diffusion bipolaire et à un compteur de particules à noyaux de condensation (CPC) pour la détection. Le présent document décrit les caractéristiques de performance et les exigences minimales relatives aux instruments et au matériel à utiliser, ainsi que les procédures de prélèvement, d’utilisation, de traitement des données, et d’assurance qualité et de contrôle qualité, y compris l’étalonnage.
Zunanji zrak - Določevanje spektra velikosti delcev atmosferskih aerosolov s spektrometrom na osnovi mobilnosti (MPSS)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2020
Zunanji zrak - Določevanje spektra velikosti delcev atmosferskih aerosolov s
spektrometrom na osnovi mobilnosti (MPSS)
Ambient air - Determination of the particle size spectra of atmospheric aerosol using a
Mobility Particle Size Spectrometer (MPSS)
Außenluft - Bestimmung des Partikelgrößenspektrums des atmosphärischen Aerosols
mit einem Partikelgrößenmobilitätsspektrometer (MPSS)
Air ambiant - Détermination de la distribution granulométrique de particules d’un aérosol
atmosphérique à l’aide d’un spectromètre de granulométrie à mobilité électrique (MPSS)
Ta slovenski standard je istoveten z: CEN/TS 17434:2020
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 17434
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
April 2020
TECHNISCHE SPEZIFIKATION
ICS 13.040.20
English Version
Ambient air - Determination of the particle number size
distribution of atmospheric aerosol using a Mobility
Particle Size Spectrometer (MPSS)
Air ambiant - Détermination de la distribution Außenluft - Bestimmung der
granulométrique de particules d'un aérosol Partikelanzahlgrößenverteilung des atmosphärischen
atmosphérique à l'aide d'un spectromètre de Aerosols mit einem Mobilitäts-
granulométrie à mobilité électrique (MPSS) Partikelgrößenspektrometer (MPSS)
This Technical Specification (CEN/TS) was approved by CEN on 22 December 2019 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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17434:2020 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 Symbols and abbreviations . 8
5 Atmospheric aerosol . 8
6 Description of the method . 10
6.1 Sampling and conditioning . 10
6.1.1 Sampling . 10
6.1.2 Aerosol Drying . 11
6.2 Determination of particle number size distribution with an MPSS . 12
6.2.1 Physical principle . 12
6.2.2 Particle charging . 12
6.2.3 Mobility analysis. 12
6.2.4 Data inversion . 16
6.2.5 Correction for particle losses due to diffusion . 16
6.2.6 Correction for CPC detection efficiency . 16
7 MPSS performance criteria and test procedures . 17
7.1 MPSS design and performance criteria . 17
7.2 Test procedures for MPSS performance criteria . 18
7.2.1 Actual aerosol flow rate . 18
7.2.2 Particle size range . 18
7.2.3 Particle size calibration accuracy . 19
7.2.4 Accuracy of integrated particle number concentration . 19
7.2.5 False background number concentration . 19
7.2.6 Flow condition . 19
7.2.7 Accuracy of the particle number size distribution. 20
8 Performance criteria and test procedures for the sampling and conditioning system . 20
8.1 General requirements . 20
8.2 Performance characteristics and criteria . 20
8.3 Particle losses due to diffusion . 21
8.4 Relative humidity . 21
8.5 Dilution factor . 21
8.6 Primary sampling flow . 22
9 Measurement procedure . 22
9.1 Measurement planning . 22
9.2 Environmental operating conditions . 22
9.3 Initial installation . 22
9.4 Initial checks on site. 22
9.5 Data reporting . 23
10 Quality control, quality assurance and measurement uncertainty . 24
10.1 General . 24
10.2 General operating procedures . 24
10.3 Frequency of calibrations, checks and maintenance . 24
10.3.1 General . 24
10.3.2 Aerosol flow rate calibration (MPSS) . 25
10.3.3 Aerosol flow rate calibration (CPC) . 25
10.3.4 Humidity, temperature and pressure sensors calibration . 26
10.3.5 CPC calibration . 26
10.3.6 Delay time check . 26
10.3.7 Mean false background concentration check (CPC) . 26
10.3.8 Leak check . 26
10.3.9 Sampling system maintenance . 26
10.3.10 Humidity sensor calibration . 26
10.3.11 Dilution factor calibration (where applicable) . 26
10.3.12 Leak check . 26
10.4 Measurement uncertainty . 27
Annex A (normative) Bipolar charge distribution . 28
Annex B (normative) Calculation of particle losses due to diffusion . 30
B.1 General equations and constants . 30
B.2 Particle losses due to diffusion in straight tubes of circular cross section . 31
B.3 Particle losses due to diffusion in a MPSS . 32
Annex C (informative) Example of the calculation of particle losses due to diffusion in a
sampling system . 33
C.1 Description of the sampling system . 33
C.2 Air properties and diffusion coefficient . 34
C.3 Losses in the primary sampling tube . 34
C.4 Particle losses due to diffusion in the secondary sampling tube and the MPSS . 35
C.5 Overall sampling losses . 36
Annex D (informative) Example of an MPSS design . 37
Annex E (informative) Dilution system . 39
E.1 Background . 39
E.2 Criteria for dilution systems . 39
E.3 Design example of a dilution system . 39
E.4 Operating parameters of a dilution system . 40
E.5 Example for the calculation of the uncertainty of the dilution factor . 42
Annex F (informative) Laminar flow .
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