ISO 7240-12:2022

INTERNATIONAL ISO
STANDARD 7240-12
Third edition
2022-06
Fire detection and alarm systems —
Part 12:
Line type smoke detectors using a
transmitted optical beam
Systèmes de détection d'incendie et d'alarme —
Partie 12: Détecteurs linéaires de fumée utilisant une transmission
par faisceaux lumineux
Reference number
© ISO 2022
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Published in Switzerland
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Contents Page
Foreword . vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements . 3
4.1 Conformance . 3
4.2 Individual alarm indication . 3
4.3 Connection of ancillary devices. 4
4.4 Monitoring of detachable detectors and connections . 4
4.5 Manufacturer’s adjustments . 4
4.6 On-site adjustment of response threshold value. 4
4.7 Protection of optical components . 4
4.8 Limit of compensation . 4
4.9 Fault signalling . 5
4.10 Software-controlled detectors . . 5
4.10.1 General . 5
4.10.2 Software documentation . 5
4.10.3 Software design . 6
4.10.4 Storage of programs and data . 6
5 Test methods . 6
5.1 General . 6
5.1.1 Atmospheric conditions for tests. 6
5.1.2 Mounting arrangements . 6
5.1.3 Operating conditions for tests. 6
5.1.4 Tolerances . 7
5.1.5 Measurement of response value . 7
5.1.6 Provision for tests . 8
5.1.7 Test schedule . 8
5.1.8 Test report . 9
5.2 Reproducibility . 9
5.2.1 Object of test. 9
5.2.2 Test procedure. 9
5.2.3 Requirements . 9
5.3 Repeatability . 9
5.3.1 Object of test. 9
5.3.2 Test procedure. 9
5.3.3 Requirements . 10
5.4 Alignment dependence . 10
5.4.1 Object of test. 10
5.4.2 Test procedure. 10
5.4.3 Requirements . 11
5.5 Variation of supply parameters . 11
5.5.1 Object . 11
5.5.2 Test procedure. 11
5.5.3 Requirements . 11
5.6 Rapid changes in attenuation . 11
5.6.1 Object of test. 11
5.6.2 Test procedure. 11
5.6.3 Requirements .12
5.7 Slow changes in attenuation . 12
5.7.1 Object of test. 12
iii
5.7.2 Test procedure.12
5.7.3 Requirements .12
5.8 Optical path length dependence . 13
5.8.1 Object of test. 13
5.8.2 Test procedure.13
5.8.3 Requirements .13
5.9 Fire sensitivity . 13
5.9.1 Object of test. 13
5.9.2 Test procedure.13
5.9.3 Requirements .15
5.10 Stray light . 15
5.10.1 Object of test. 15
5.10.2 Test procedure. 15
5.10.3 Requirements . 16
5.11 Dry heat (operational) . 16
5.11.1 Object of test. 16
5.11.2 Test procedure. 16
5.11.3 Requirements . 17
5.12 Cold (operational) . 17
5.12.1 Object of test.
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