ISO INTERNATIONAL STANDARD 15900 Second edition 2020-10-20 Determination of particle size distribution Differential electrical mobility analysis for aerosol particles Determinationde la distributiongranulometrique-Analysede mobilite électrique differentiellepour les particules d'aerosol Reference number ISO15900:2020(E) ISO @ISO 2020 IS0 2020,Published in Switzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii @IS0 2020 - All rights reserved Contents Page Foreword ..V Introduction. .. i. 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols. 5 General principle .5 5.1 Particle sizeclassificationwiththeDEMC .5 5.2 Relationship between electrical mobility and particle size .6 5.3 Measurementand data inversion .7 5.4 Transfer function oftheDEMC. 5.5 Charge distribution function. .9 5.5.1 General 5.5.2 Charge distribution function for radioactive bipolar charge conditioners .9 5.5.3 Charge distribution functions for other bipolar and unipolar charge ..10 conditioners 5.6 Particle losses in the DMAS ..11 5.7 ..11 Effects due to non-spherical particles. 5.8 Measurement of particle sizesbelow10 nm .11 5.9 Traceability of measurement results ..11 System and apparatus .13 6 General configuration ..13 6.1 6.2 Components. ..14 6.2.1 Pre-conditioner ..14 6.2.2 Charge conditioner ..14 6.2.3 DEMC .15 6.2.4 Aerosolparticledetector .15 ..15 6.2.5 System controller, data acquisition and analysis 7 Measurementprocedures. ..16 7.1 Setupandpreparation ofthe instrument ..16 7.1.1 General. ..16 7.1.2 Aerosol pre-conditioning: Adapting the aerosol to be measured to the ..16 requirements oftheDMAS .16 7.1.3 Aerosol pre-conditioning: Separation of large particles 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 Periodictests and calibrations .20 8.1 Overview 20 8.2 Zerotests .21 8.2.1 ..21 General. iii IS0 2020-All rights reserved