ISO INTERNATIONAL STANDARD 7240-31 First edition 2022-09 Fire detection and alarm systems Part 31: Resettable line-type heat detectors Systemes de détection et d'alarme incendie - Partie 31: Détecteurs de chaleur en ligne resetable Reference number IS0 7240-31:2022(E) ISO @IS02022 IS0 7240-31:2022(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2022 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 or Iso's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @IS02022-Allrightsreserved IS0 7240-31:2022(E) Contents Page Foreword. .vili Introduction ..ix 1 Scope 2 Normative references ..1 3 Terms and definitions 4 Requirements .3 4.1 General. 4.1.1 Conformance. 3 4.1.2 Heat response classes 3 4.2 Individual alarm indication 5 4.3 Signalling 5 4.4 Repeatability .6 4.5 Reproducibility. 6 4.6 Connection of ancillary devices. .6 4.7 Manufacturer's adjustments. 4.8 Software. 6 4.8.1 General .6 4.8.2 Software design 6 4.8.3 The storage of programs and data 4.9 Sensing element fault. 4.10 On-siteadjustmentofresponsebehaviour 7 4.11 Maximum ambient temperature test (sensing element) 4.12 Variation in supply parameters. 7 4.13 Low voltage fault 7 4.14 Fire sensitivity for Class A and ror-only RLTHD 7 4.15 Static response temperature test .7 4.16 .8 4.17 Dry heat (operational) sensor control unit. 8 4.18 Dry heat (endurance) for sensor control unit and sensing element .8 4.19 Cold (operational) for sensing element.. 4.20 Cold (operational) for sensor control unit. 8 4.21 Damp heat, steady-state (endurance) for sensor control unit and sensing element .8 4.22 Damp heat, cyclic (operational) for sensing element .8 4.23 Damp heat, cyclic (operational) for sensor control unit .8 4.24 Damp heat, steady-state (operational) for sensor control unit. .8 4.25 Damp heat, cyclic (endurance) for sensor control unit and sensing element 4.26 Shock (operational) for sensor control unit .8 4.27 Impact (operational) for sensor control unit. 9 4.28 Impact (operational) for sensing element. 9 4.29 Vibration, sinusoidal (operational) for sensor control unit 9 4.30 Vibration, sinusoidal (operational) for sensing element 9 4.31 Vibration, sinusoidal (endurance) for sensor control unit. 9 4.32 Vibration, sinusoidal (endurance) for sensing element. 9 4.33 Sulfur dioxide (SO2) corrosion (endurance) for sensing element .9 4.34 Sulfur dioxide (so2) corrosion (endurance) for sensor control unit 4.35 Electromagnetic immunity .9 5 Test methods .9 5.1 General. .9 5.1.1 Atmospheric conditions for tests. 5.1.2 Operating conditions for tests. 10 5.1.3 Mounting arrangements 10 5.1.4 Tolerances. 10 @ IS0 2022 - All rights reserved iii IS0 7240-31:2022(E) 5.1.5 Procedure for measurement of response time 10 5.1.6 Provision for tests 11 5.1.7 Test schedule. 12 5.2 Individual alarm indication 14 5.3 Signalling 14 5.4 Repeatability. 14 5.4.1 Object of the test. 14 5.4.2 Test procedure.. 14 5.4.3 Requirements. 15 5.5 Reproducibility. 15 5.5.1 Object of the test. 15 5.5.2 Test procedure. 15 5.5.3 Requirements.. 15 5.6 Connection of ancillary devices. 15 5.7 Manufacturer's adjustments 15 5.8 Requirements for software-controlled detectors 15 5.9 Sensing element fault. 15 5.9.1 Object of the test.. 15 5.9.2 Sensing element operational continuity 16 5.9.3 Requirements. 16 5.10 On-site adjustment of response behaviour 16 5.11 Maximum ambient temperature test (sensing element) 16 5.11.1 Object of the test. 16 5.11.2 Mounting of the sensing element 16 5.11.3 Test procedure.. 16 5.11.4 Requirements. 16 5.12 Variation in supply parameters. 16 5.12.1 Object of the test... 16 5.12.2 Test procedure.. 17 5.12.3 Requirements. 17 5.13