ISO 7240-8:2014

INTERNATIONAL ISO
STANDARD 7240-8
Second edition
2014-12-15
Fire detection and alarm systems —
Part 8:
Point-type fire detectors using
a carbon monoxide sensor in
combination with a heat sensor
Systèmes de détection et d’alarme d’incendie —
Partie 8: Détecteurs ponctuels utilisant un capteur de monoxide de
carbone en combinaison avec un capteur de chaleur
Reference number
©
ISO 2014
© ISO 2014
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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

Contents Page
Foreword .vi
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 2
4 Requirements . 2
4.1 Compliance . 2
4.2 Individual alarm indication . 2
4.3 Connection of ancillary devices . 3
4.4 Monitoring of detachable detectors . 3
4.5 Manufacturer’s adjustments . 3
4.6 On-site adjustment of response behaviour . 3
4.7 Rate-sensitive response behaviour . 3
4.8 Requirements for software-controlled detectors . 4
4.8.1 General. 4
4.8.2 Software design. 4
4.8.3 The storage of programs and data . 4
5 Tests . 4
5.1 General . 4
5.1.1 Atmospheric conditions for tests. 4
5.1.2 Mounting arrangements . 4
5.1.3 Operating conditions for tests . 5
5.1.4 Tolerances . 5
5.1.5 Measurement of CO response value . 5
5.1.6 Measurement of heat sensor response value . 6
5.1.7 Provision for tests . 6
5.1.8 Test schedule . 7
5.1.9 Test report . 7
5.2 Repeatability of CO response . 7
5.2.1 Object of the test . 7
5.2.2 Test procedure . 7
5.2.3 Requirements . 7
5.3 Directional dependence of CO response . 8
5.3.1 Object of the test . 8
5.3.2 Test procedure . 8
5.3.3 Requirements . 9
5.4 Directional dependence of heat response . 9
5.4.1 Object of the test . 9
5.4.2 Test procedure . 9
5.4.3 Requirements . 9
5.5 Lower limit of heat sensitivity . 9
5.5.1 Object of the test . 9
5.5.2 Test procedure . 9
5.5.3 Requirements .10
5.6 Reproducibility of CO response .10
5.6.1 Object of the test .10
5.6.2 Test procedure .10
5.6.3 Requirements .10
5.7 Reproducibility of heat response .10
5.7.1 Object of the test .10
5.7.2 Test procedure .10
5.7.3 Requirements .11
5.8 Exposure to chemical agents at environmental concentrations .11
5.8.1 Object of the test .11
5.8.2 Test procedure .11
5.8.3 Requirements .11
5.9 Long-term stability of CO response.12
5.9.1 Object of the test .12
5.9.2 Test procedure .12
5.9.3 Requirements .12
5.10 Saturation .12
5.10.1 Object of the test .12
5.10.2 Test procedure .13
5.10.3 Requirements .13
5.11 Exposure to chemical agents which may be present during a fire .13
5.11.1 Object of the test .13
5.11.2 Test procedure .13
5.11.3 Requirements .14
5.12 Variation in supply parameters .14
5.12.1 Object of the test .14
5.12.2 Test procedure .14
5.12.3 Requirements .
...