ISO INTERNATIONAL STANDARD 27891 First edition 2015-03-01 Aerosol particle number concentration Calibration of condensation particle counters Densité de particules d'aérosol - Etalonnage de compteurs de particules d'aérosol a condensation Reference number IS0 27891:2015(E) ISO International Organization for Standardization ee=Zhejang Institute of Standardization 5956617 @IS02015 vided by IHS under I No reproduction or networking permitted without license from IHS IS0 27891:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2015 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 Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland DrganizationforStandardization HS und Not for Resale, 2015/6/2 06:53:51 networking permited without license from IHS IS0 27891:2015(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references. 3 Terms and definitions 4 Symbols. 5 .8 Calibration using reference instruments - General principles 5.1 General principles .8 5.2 Objectives for the calibration aerosol .9 5.3 Setup overview .9 5.4 Components and their requirements ..10 5.4.1 Primary aerosol source .10 5.4.2 Charge conditioner. .11 5.4.3 DEMC .11 5.4.4 Make-up or bleed air ..11 5.4.5 Mixing device, flow splitter and connection tubing ..12 5.4.6 Reference instrument: FCAE or CPC ..12 5.4.7 Other tools ..14 5.5 Differences between FCAE and CPC as a reference instrument ..14 6 Calibration using an FCAE as reference instrument. ..15 6.1 Overview of the setup and calibration procedure. .15 6.2 Preparation.. ..18 6.2.1 General preparation 6.2.2 Primary aerosol ..18 6.2.3 Other equipment. ..18 6.2.4 DEMC .18 6.2.5 FCAE. .19 6.2.6 Test CPC .20 6.2.7 Check of the complete setup 21 6.3 Calibration procedure of detection efficiency 23 6.3.1 General. 23 6.3.2 DEMC diameter adjustment. 23 6.3.3 Primary aerosol adjustment. 23 6.3.4 Splitter bias β measurement. 24 6.3.5 Test CPC efficiency measurement 24 6.3.6 Measurement of different particle concentrations 26 6.3.7 Measurement of different sizes. .26 6.3.8 Repetitionoffirstmeasurementpoint .26 6.3.9 Preparation of the calibration certificate .26 6.4 Measurement uncertainty 26 6.4.1 General. 26 6.4.2 Particle size 27 6.4.3 Detection efficiency. 27 6.4.4 Particle number concentration .28 ii icensee=Zhejiang Institute of Standardization 5956617 d without license from IHS Not for Resale, 2015/6/2 06:53:51 IS0 27891:2015(E) Contents Page 7 Calibration using a CPC as reference instrument 28 7.1 Overview of the setup and calibration procedure 28 7.2 Preparation 31 7.2.1 General preparation 31 7.2.2 Primary aerosol .31 7.2.3 Other equipment 31 7.2.4 DEMC. 31 7.2.5 Reference CPC. 32 7.2.6 Test CPC 33 7.2.7 Check of the complete setup .33 7.3 Calibration procedure of detection efficiency 35 7.3.1 General. .35 7.3.2 DEMC diameter adjustment 35 7.3.3 Primary aerosol adjustment 36 7.3.4 Splitter bias β measurement. 36 7.3.5 Test CPC efficiency measurement .37 7.3.6 Measurement of different particle concentrations 38 7.3.7 Measurement of different sizes. 38 7.3.8 Repetition of first measurement point 38 7.3.9 Preparation of the calibration certificate 38 7.4 Measurement uncertainty 38 7.4.1 General. 38 7.4.2 Particle size 39 7.4.3 Detection efficiency 39 7.4.4 Particle number concentration 40 8 Reporting of results 40 Annex A (informative) CPC performance characteristics 42 Annex B (informative) Effect of particle surface properties on the CPC detection efficiency .51 Annex C (informative) Example calibration certificates .53 Annex D (normative) Calculation of t