ISO 7240-27:2025
(Main)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
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
This document specifies requirements, test methods and performance criteria for multi-sensor point fire detectors that incorporate a smoke sensor, a carbon monoxide (CO) sensor and, optionally, one or more heat sensors, for use in fire detection and alarm systems installed in buildings (see ISO 7240-1). This document is not applicable to fire detectors using smoke, CO and, optionally heat sensors, which have special characteristics, and which have been developed for specific risks. For the testing of other types of fire detectors using smoke, CO and, optionally, heat sensors working on different principles, this document can therefore be used only for guidance.
Systèmes de détection et d'alarme d'incendie — Partie 27: Détecteurs 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
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ISO 7240-27
Third edition
Fire detection and alarm systems —
2025-04
Part 27:
Point type fire detectors using a
smoke sensor in combination with
a carbon monoxide sensor and,
optionally, one or more heat sensors
Systèmes de détection et d'alarme d'incendie —
Partie 27: Détecteurs 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
© ISO 2025
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Published in Switzerland
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Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General requirements . 2
4.1 Conformance .2
4.2 Response threshold value of detectors using scattered or transmitted light .2
4.3 Individual alarm indication .2
4.4 Connection of ancillary devices.3
4.5 Monitoring of detachable detectors . .3
4.6 Manufacturer’s adjustments .3
4.7 On-site adjustment of response behaviour .3
4.8 Protection against the ingress of foreign bodies .3
4.9 Rate-sensitive CO response behaviour .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 Test methods . 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 .5
5.1.4 Tolerances .5
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 response value .6
5.1.8 Provision for tests .7
5.1.9 Test schedule .7
5.1.10 Test report .9
5.2 Repeatability of smoke response .9
5.2.1 Objective of the test .9
5.2.2 Test procedure.9
5.2.3 Requirements .9
5.3 Repeatability of CO response . .9
5.3.1 Objective of the test .9
5.3.2 Test procedure.9
5.3.3 Requirements .9
5.4 Directional dependence of smoke response .9
5.4.1 Objective of the test .9
5.4.2 Test procedure.10
5.4.3 Requirements .10
5.5 Directional dependence of CO response .10
5.5.1 Objective of the test .10
5.5.2 Test procedure.10
5.5.3 Requirements .10
5.6 Directional dependence of heat response (optional function) .10
5.6.1 Objective of the test .10
5.6.2 Test procedure.10
5.6.3 Requirements .11
5.7 Lower limit of heat response (optional function) .11
iii
5.7.1 Objective of the test .11
5.7.2 Test procedure.11
5.7.3 Requirements .11
5.8 Reproducibility of smoke response .11
5.8.1 Objective of the test .11
5.8.2 Test procedure.11
5.8.3 Requirements . 12
5.9 Reproducibility of CO response . 12
5.9.1 Objective of the test . 12
5.9.2 Test procedure. 12
5.9.3 Requirements . 12
5.10 Reproducibility of heat response (optional function). 12
5.10.1 Objective of the test . 12
5.10.2 Test procedure. 12
5.10.3 Requirements . 12
5.11 Exposure to chemical agents at environmental concentrations . 13
5.11.1 Objective of the test .
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