ISO INTERNATIONAL STANDARD 12239 Third edition 2021-11 Smoke alarms using scattered light, transmitted light or ionization Dispositifs d'alarme de fumée fonctionnant suivant le principe de la diffusion de la lumiere, de la transmission de la lumiere ou de I'ionisation Reference number IS0 12239:2021(E) ISO @IS02021 IS0 12239:2021(E) COPYRIGHT PROTECTED DOCUMENT @ IS02021 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved