ISO/PRF 7240-7

Fire detection and alarm systems — Part 7: Point-type smoke detectors using scattered light, transmitted light or ionization

Systèmes de détection et d'alarme d'incendie — Partie 7: Détecteurs de fumée ponctuels utilisant le principe de la diffusion de la lumière, de la transmission de la lumière ou de l'ionisation

General Information

• Status: Not Published
• ICS: 13.220.20 - Fire protection
• Technical Committee: ISO/TC 21/SC 3 - Fire detection and alarm systems
• Drafting Committee: ISO/TC 21/SC 3/WG 6 - Smoke detectors
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Completion Date: 03-May-2023

Relations

• Revises: ISO 7240-7:2018 - Fire detection and alarm systems — Part 7: Point-type smoke detectors using scattered light, transmitted light or ionization
• Effective Date: 23-Apr-2020

Standards Content (Sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 7240-7
ISO/TC 21/SC 3 Secretariat: SA
Voting begins on: Voting terminates on:
2022-07-11 2022-10-03
Fire detection and alarm systems —
Part 7:
Point-type smoke detectors using scattered light,
transmitted light or ionization
Systèmes de détection et d'alarme d'incendie —

Partie 7: Détecteurs de fumée ponctuels utilisant le principe de la diffusion de la lumière, de la transmission

de la lumière ou de l'ionisation
ICS: 13.220.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 7240-7:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 1 ----------------------
ISO/DIS 7240-7:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 7240-7
ISO/TC 21/SC 3 Secretariat: SA
Voting begins on: Voting terminates on:
Fire detection and alarm systems —
Part 7:
Point-type smoke detectors using scattered light,
transmitted light or ionization
Systèmes de détection et d'alarme d'incendie —

Partie 7: Détecteurs de fumée ponctuels utilisant le principe de la diffusion de la lumière, de la transmission

de la lumière ou de l'ionisation
ICS: 13.220.20
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

NOT BE REFERRED TO AS AN INTERNATIONAL

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

IN ADDITION TO THEIR EVALUATION AS

or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,

TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 7240-7:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 2 ----------------------
ISO/DIS 7240-7:2022(E)
Contents Page

Foreword ....................................................................................................................................................................................................................................... vi

Introduction .............................................................................................................................................................................................................................vii

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 General requirements .................................................................................................................................................................................... 3

4.1 Compliance ................................................................................................................................................................................................. 3

4.2 Response threshold value of detectors using scattered or transmitted light ............................... 3

4.3 Individual alarm indication ........................................................................................................................................................ 3

4.4 Connection of ancillary devices............................................................................................................................................... 3

4.5 Monitoring of detachable detectors ..................................................................................................................................... 3

4.6 Manufacturer's adjustments ...................................................................................................................................................... 4

4.7 On-site adjustment of response behaviour ................................................................................................................... 4

4.8 Protection against the ingress of foreign bodies ..................................................................................................... 4

4.8.1 Closed detectors ................................................................................................................................................................. 4

4.8.2 Open detectors ..................................................................................................................................................................... 4

4.9 Response to slowly developing fires ................................................................................................................................... 4

4.10 Requirements for software-controlled detectors ................................................................................................... 5

4.10.1 General ........................................................................................................................................................................................ 5

4.10.2 Software design .................................................................................................................................................................. 5

4.10.3 Storage of programs and data ................................................................................................................................ 5

5 Tests .................................................................................................................................................................................................................................. 5

5.1 General ........................................................................................................................................................................................................... 5

5.1.1 Atmospheric conditions for tests......................................................................................................................... 5

5.1.2 Operating conditions for tests................................................................................................................................ 5

5.1.3 Mounting arrangements .............................................................................................................................................. 6

5.1.4 Tolerances ................................................................................................................................................................................. 6

5.1.5 Measurement of response threshold value ................................................................................................. 6

5.1.6 Provision for tests ............................................................................................................................................................. 7

5.1.7 Test schedule .......................................................................................................................................................................... 7

5.1.8 Test report ................................................................................................................................................................................ 8

5.2 Repeatability ............................................................................................................................................................................................ 8

5.2.1 Object of test........................................................................................................................................................................... 8

5.2.2 Test procedure...................................................................................................................................................................... 8

5.2.3 Requirements ........................................................................................................................................................................ 8

5.3 Directional dependence .................................................................................................................................................................. 8

5.3.1 Object of test........................................................................................................................................................................... 8

5.3.2 Test procedure...................................................................................................................................................................... 8

5.3.3 Requirements ........................................................................................................................................................................ 8

5.4 Reproducibility ....................................................................................................................................................................................... 9

5.4.1 Object of test........................................................................................................................................................................... 9

5.4.2 Test procedure...................................................................................................................................................................... 9

5.4.3 Requirements ........................................................................................................................................................................ 9

5.5 Variation in supply parameters ............................................................................................................................................... 9

5.5.1 Object of test........................................................................................................................................................................... 9

5.5.2 Test procedure...................................................................................................................................................................... 9

5.5.3 Requirements ........................................................................................................................................................................ 9

5.6 Air movement ....................................................................................................................................................................................... 10

5.6.1 Object of test........................................................................................................................................................................ 10

5.6.2 Test procedure................................................................................................................................................................... 10

5.6.3 Requirements ..................................................................................................................................................................... 10

5.7 Dazzling ..................................................................................................................................................................................................... 10

iii
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ISO/DIS 7240-7:2022(E)

5.7.1 Object of test........................................................................................................................................................................ 10

5.7.2 Test procedure................................................................................................................................................................... 11

5.7.3 Requirements ..................................................................................................................................................................... 11

5.8 Additional tests for open detectors .................................................................................................................................. 11

5.8.1 Object of the test .............................................................................................................................................................. 11

5.8.2 Test procedure................................................................................................................................................................... 11

5.9 Dry heat (operational) .................................................................................................................................................................. 12

5.9.1 Object of test........................................................................................................................................................................ 12

5.9.2 Test procedure...................................................................................................................................................................12

5.9.3 Requirements .....................................................................................................................................................................12

5.10 Cold (operational) .............................................................................................................................................................................12

5.10.1 Object of test........................................................................................................................................................................ 12

5.10.2 Test procedure................................................................................................................................................................... 13

5.10.3 Requirements .....................................................................................................................................................................13

5.11 Damp heat, steady state (operational) ........................................................................................................................... 13

5.11.1 Object of test........................................................................................................................................................................ 13

5.11.2 Test procedure...................................................................................................................................................................13

5.11.3 Requirements ..................................................................................................................................................................... 14

5.12 Damp heat, steady state (endurance) .............................................................................................................................. 14

5.12.1 Object of test........................................................................................................................................................................ 14

5.12.2 Test procedure................................................................................................................................................................... 14

5.12.3 Requirements .....................................................................................................................................................................15

5.13 Sulfur dioxide (SO2) corrosion (endurance) ............................................................................................................. 15

5.13.1 Object of test........................................................................................................................................................................ 15

5.13.2 Test procedure................................................................................................................................................................... 15

5.13.3 Requirements ..................................................................................................................................................................... 16

5.14 Shock (operational) ......................................................................................................................................................................... 16

5.14.1 Object of test........................................................................................................................................................................ 16

5.14.2 Test procedure................................................................................................................................................................... 16

5.14.3 Requirements ..................................................................................................................................................................... 17

5.15 Impact (operational) ...................................................................................................................................................................... 17

5.15.1 Object of test........................................................................................................................................................................ 17

5.15.2 Test procedure................................................................................................................................................................... 17

5.15.3 Requirements ..................................................................................................................................................................... 17

5.16 Vibration, sinusoidal, (operational) .................................................................................................................................. 18

5.16.1 Object of test........................................................................................................................................................................ 18

5.16.2 Test procedure................................................................................................................................................................... 18

5.16.3 Requirements ..................................................................................................................................................................... 19

5.17 Vibration, sinusoidal (endurance) ...................................................................................................................................... 19

5.17.1 Object of test........................................................................................................................................................................ 19

5.17.2 Test procedure................................................................................................................................................................... 19

5.17.3 Requirements ..................................................................................................................................................................... 19

5.18 Electromagnetic compatibility (EMC) immunity tests (operational) ................................................ 20

5.19 Fire sensitivity ..................................................................................................................................................................................... 20

5.19.1 Object of test........................................................................................................................................................................ 20

5.19.2 Test procedure...................................................................................................................................................................20

5.19.3 Requirements .....................................................................................................................................................................22

6 Test report ...............................................................................................................................................................................................................22

7 Marking ........................................................................................................................................... ............................................................................22

8 Data .................................................................................................................................................................................................................................23

8.1 Hardware documentation .........................................................................................................................................................23

8.2 Software documentation ............................................................................................................................................................23

Annex A (normative) Smoke tunnel for response threshold value measurements .......................................25

Annex B (normative) Test aerosol for response threshold value measurements ............................................26

Annex C (normative) Smoke-measuring instruments ...................................................................................................................27

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ISO/DIS 7240-7:2022(E)

Annex D (normative) Apparatus for dazzling test .............................................................................................................................31

Annex E (normative) Apparatus for impact test...................................................................................................................................32

Annex F (normative) Fire test room ..................................................................................................................................................................34

Annex G (normative) Smouldering (pyrolysis) wood fire (TF2) .........................................................................................36

Annex H (normative) Glowing smouldering cotton fire (TF3) ..............................................................................................39

Annex I (normative) Flaming plastics (polyurethane) fire (TF4) .....................................................................................42

Annex J (normative) Flaming liquid (n-heptane) fire (TF5) ....................................................................................................45

Annex K (informative) Information concerning the construction of the smoke tunnel ...........................48

Annex L (informative) Compensation for detector drift .............................................................................................................51

Annex M (informative) Information concerning the construction of the measuring

ionization chamber ........................................................................................................................................................................................55

Annex N (normative) Apparatus for open detector static object test ............................................................................57

Annex O (normative) Apparatus for testing the protection against the effect of moving

objects ..........................................................................................................................................................................................................................58

Bibliography .............................................................................................................................................................................................................................60

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ISO/DIS 7240-7:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire

fighting, Subcommittee SC 3, Fire detection and alarm systems.

This edition cancels and replaces the previous edition (ISO 7240:2018), which has been technically

revised.

The main change compared to the previous edition is the revised response threshold values of Band 1

and Band 2 in Clause 4.2.
A list of all parts in the ISO 7240 series can be found on the ISO website.
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ISO/DIS 7240-7:2022(E)
Introduction

A fire detection and alarm system is required to function satisfactorily not only in the event of fire, but

also during and after exposure to conditions likely to be met in practice, including corrosion, vibration,

direct impact, indirect shock and electromagnetic interference. Specific tests are intended to assess the

performance of the smoke detectors under such conditions.

This document is not intended to place any other restrictions on the design and construction of such

detectors.

This edition of this document introduces a requirement for smoke detectors that operate on the

scattered or transmitted light principle to be marked with one of two possible nominal response

threshold value bands. This marking provides for a clearer choice of response values so that the risk of

unwanted alarms may be decreased in installations where unfavourable environmental conditions are

present.

NOTE For some test fires, smoke detectors that operate on the scattered or transmitted light principle and

that have been factory set to the upper response threshold value band can fall outside one of the classification

limits given in ISO/TS 7240-9.
vii
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