ISO INTERNATIONAL STANDARD 7240-27 Second edition 2018-05 Fire detection and alarm systems Part 27: Point type fire detectors using a smoke sensor in combination with a carbon monoxide sensor and, optionally, one or more heat sensors Systemes de détection et d'alarme d'incendie- Partie 27: Deétecteurs ponctuels d'incendie utilisant un capteur de fumée en combinaison avec un capteur de monoxyde de carbone (co) et, optionnellement, un ou plusieurs capteurs de chaleur Reference number IS0 7240-27:2018(E) @ IS0 2018 IS0 7240-27:2018(E) COPYRIGHTPROTECTED DOCUMENT @IS02018 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 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 7240-27:2018(E) Contents Page Foreword ..vii Introduction. .viii 1 Scope. 2 Normative references 3 Terms, definitions and symbols. ..2 4 General requirements. .2 4.1 Compliance. 2 4.2 Response threshold value of detectors using scattered or transmitted light. 2 4.3 Individual alarm indication. .2 4.4 Connection ofancillarydevices .3 4.5 Monitoring of detachable detectors. 3 4.6 Manufacturer's adjustments.. 4.7 On-site adjustment of response behaviour 3 4.8 Protection against the ingress of foreign bodies 3 4.9 Rate-sensitiveCOresponsebehaviour 3 4.10 Smoke response to slowly developing fires .4 4.11 Requirements for software controlled detectors 4 4.11.1 General .4 4.11.2 Software design ..4 4.11.3 Storage of programs and data .4 5 Tests .5 5.1 General .5 5.1.1 Atmosphericconditionsfortests 5 5.1.2 Operating conditions for tests. .5 5.1.3 Mounting arrangement... .5 5.1.4 Tolerances. 5.1.5 Measurement of smoke response threshold value 5 5.1.6 Measurement of cO response threshold value .6 5.1.7 Measurement of heat sensor response value. .6 5.1.8 Provisionfortests ..7 5.1.9 Test schedule .8 5.1.10 Test report. 8 5.2 Repeatability of smoke response .8 5.2.1 Object of the test. .8 5.2.2 Test procedure 5.2.3 Requirements 8 5.3 Repeatability of cO response .8 5.3.1 Object of the test. ..8 5.3.2 Test procedure 5.3.3 Requirements. ..10 5.4 Directional dependence of smoke response .10 5.4.1 Object of the test .10 5.4.2 Test procedure .10 5.4.3 Requirements .10 5.5 Directional dependence of CO response ..10 5.5.1 Object of the test .10 5.5.2 Test procedure .10 5.5.3 Reguirements .10 5.6 Directional dependence of heat response (optional function) ..11 5.6.1 Object of the test ..11 5.6.2 Test procedure .11 5.6.3 Requirements 11 @IS02018-All rightsreserved ili