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ISO

ISO 15900:2020

(Main)

Determination of particle size distribution — Differential electrical mobility analysis for aerosol particles

Determination of particle size distribution — Differential electrical mobility analysis for aerosol particles

This document provides guidelines and requirements for the determination of aerosol particle number size distribution by means of the analysis of electrical mobility of aerosol particles. This measurement is usually called "differential electrical mobility analysis for aerosol particles". This analytical method is applicable to particle size measurements ranging from approximately 1 nm to 1 µm. This document does not address the specific instrument design or the specific requirements of particle size distribution measurements for different applications but includes the calculation method of uncertainty. In this document, the complete system for carrying out differential electrical mobility analysis is referred to as DMAS (differential mobility analysing system), while the element within this system that classifies the particles according to their electrical mobility is referred to as DEMC (differential electrical mobility classifier). NOTE This document does not include technical requirements and specifications for the application of DMAS, which are defined in application specific standards or guidelines, e.g. for road vehicle applications (ISO/TC 22), environmental measurements (ISO/TC 146) or nanotechnologies (ISO/TC 229).

Détermination de la distribution granulométrique — Analyse de mobilité électrique différentielle pour les particules d'aérosol

General Information

Status
Published
Publication Date
19-Oct-2020
ICS
19.120 - Particle size analysis. Sieving
Technical Committee
ISO/TC 24/SC 4 - Particle characterization
Drafting Committee
ISO/TC 24/SC 4/WG 12 - Electrical mobility and number concentration analysis for aerosol particles
Current Stage
9020 - International Standard under periodical review
Start Date
15-Oct-2025
Completion Date
15-Oct-2025
Ref Project

Relations

Revises
ISO 15900:2009 - Determination of particle size distribution — Differential electrical mobility analysis for aerosol particles
Effective Date
11-Oct-2014
ISO 15900:2020 - Determination of particle size distribution -- Differential electrical mobility analysis for aerosol particlesISO 15900:2020 - Determination of particle size distribution -- Differential electrical mobility analysis for aerosol particles
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Standard
ISO 15900:2020 - Determination of particle size distribution -- Differential electrical mobility analysis for aerosol particles
English language
92 pages
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Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 15900
Second edition
2020-10
Determination of particle size
distribution — Differential electrical
mobility analysis for aerosol particles
Détermination de la distribution granulométrique — Analyse de
mobilité électrique différentielle pour les particules d'aérosol
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 4
5 General principle . 5
5.1 Particle size classification with the DEMC . 5
5.2 Relationship between electrical mobility and particle size . 6
5.3 Measurement and data inversion . 7
5.4 Transfer function of the DEMC . 8
5.5 Charge distribution function . 9
5.5.1 General. 9
5.5.2 Charge distribution function for radioactive bipolar charge conditioners . 9
5.5.3 Charge distribution functions for other bipolar and unipolar charge
conditioners .10
5.6 Particle losses in the DMAS .11
5.7 Effects due to non-spherical particles.11
5.8 Measurement of particle sizes below 10 nm .11
5.9 Traceability of measurement results .11
6 System and apparatus .13
6.1 General configuration .13
6.2 Components .14
6.2.1 Pre-conditioner .14
6.2.2 Charge conditioner .14
6.2.3 DEMC .15
6.2.4 Aerosol particle detector .15
6.2.5 System controller, data acquisition and analysis .15
7 Measurement procedures .16
7.1 Setup and preparation of the instrument .16
7.1.1 General.16
7.1.2 Aerosol pre-conditioning: Adapting the aerosol to be measured to the
requirements of the DMAS .16
7.1.3 Aerosol pre-conditioning: Separation of large particles .16
7.1.4 Charge conditioning .17
7.1.5 DEMC: Flows .17
7.1.6 DEMC: Voltage .18
7.1.7 DEMC: Temperature and pressure .18
7.1.8 Particle detection: CPC . . .18
7.1.9 Particle detection: FCAE .18
7.1.10 Data acquisition .18
7.2 Pre-measurement checks.18
7.2.1 General.18
7.2.2 Overall DMAS check .19
7.2.3 Data acquisition check .19
7.3 Measurement .19
7.4 Maintenance .19
8 Periodic tests and calibrations .20
8.1 Overview .20
8.2 Zero tests .21
8.2.1 General.21
8.2.2 Particle detector zero test .21
8.2.3 Overall DMAS zero test with inlet filter .21
8.2.4 Overall DMAS zero test with DEMC voltage set to 0 V .21
8.3 Flow rate tests .21
8.4 Voltage calibration .22
8.5 Charge conditioner test .22
8.6 Calibration for size measurement .22
8.6.1 General.22
8.6.2 Purpose of calibration .22
8.6.3 Particle size standards .22
8.6.4 Dynamic DMAS particle size calibration procedure .23
8.6.5 Static DMAS particle size calibration procedure .24
8.7 Size resolution test .28
8.8 Number concentration calibration .28
9 Using a DEMC at a fixed voltage to generate particles of a chosen size .29
9.1 General .29
9.2 Multiply-charged particles .30
9.3 Size calibration with certified spheres .30
9.4 Sheath flow .30
9.5 Slip correction (if applicable) .31
9.6 Voltage (if applicable) .31
9.7 Calculation of overall uncertainty .31
10 Reporting of results .31
Annex A (informative) Charge conditioners and charge distributions .33
Annex B (informative) Particle detectors .44
Annex C (informative)
...

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