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 7240-8:2014(E)
©
ISO 2014

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ISO 7240-8:2014(E)

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© ISO 2014
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Published in Switzerland
ii © ISO 2014 – All rights reserved

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ISO 7240-8:2014(E)

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
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ISO 7240-8:2014(E)

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 .15
5.13 Air movement.15
5.13.1 Object of the test .15
5.13.2 Test procedure .15
5.13.3 Requirements .15
5.14 Dry heat (operational) .16
5.14.1 Object of the test .16
5.14.2 Test procedure .16
5.14.3 Requirements .16
5.15 Dry heat endurance .16
5.15.1 Object .16
5.15.2 Test procedure .17
5.15.3 Requirements .17
5.16 Cold (operational) .17
5.16.1 Object of the test .17
5.16.2 Test procedure .18
5.16.3 Requirements .18
5.17 Damp heat, cyclic (operational) .19
5.17.1 Object .19
5.17.2 Test procedure .19
5.17.3 Requirements .19
5.18 Damp heat, steady-state (endurance) .20
5.18.1 Object of the test .20
5.18.2 Test procedure .20
5.18.3 Requirements .20
5.19 Low humidity, steady-state (endurance) .21
5.19.1 Object of the test .21
5.19.2 Test procedure .21
5.19.3 Requirements .21
5.20 Sulfur dioxide SO corrosion (endurance) .22
2
5.20.1 Object of the test .22
5.20.2 Test procedure .22
5.20.3 Requirements .22
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ISO 7240-8:2014(E)

5.21 Shock (operational) .23
5.21.1 Object of the test .23
5.21.2 Test procedure .23
5.21.3 Requirements .24
5.22 Impact (operational) .24
5.22.1 Object of the test .24
5.22.2 Test procedure .24
5.22.3 Requirements .25
5.23 Vibration, sinusoidal, (operational) .25
5.23.1 Object of the test .25
5.23.2 Test procedure .25
5.23.3 Requirements .26
5.24 Vibration, sinusoidal (endurance) .26
5.24.1 Object of the test .26
5.24.2 Test procedure .26
5.24.3 Requirements .27
5.25 Electromagnetic Compatibility (EMC), Immunity tests (operational) .27
5.26 Fire sensitivity .28
5.26.1 Object of the test .28
5.26.2 Test procedure .28
6 Test report .30
7 Marking .30
8 Data .31
8.1 Hardware documentation .31
8.2 Software documentation .31
Annex A (normative) Gas test chamber for CO response value and cross
sensitivity measurements .33
Annex B (normative) Heat tunnel for response time and response temperature measurements .34
Annex C (normative) Apparatus for impact test .35
Annex D (normative) Fire test room .37
Annex E (normative) Smouldering (pyrolysis) wood fire (TF2) .39
Annex F (normative) Glowing smouldering cotton fire (TF3) .43
Annex G (normative) Open plastics (polyurethane) fire (TF4) .47
Annex H (normative) Liquid (n-heptane) fire (TF5) .50
Annex I (informative) Information concerning the construction of the gas test chamber .53
Annex J (informative) Construction of the heat tunnel .55
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ISO 7240-8:2014(E)

Foreword
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The committee responsible for this document is ISO/TC 21, Equipment for fire protection and firefighting,
Subcommittee SC 3, Fire detection and alarm systems.
This second edition cancels and replaces the first edition (ISO 7240-8:2007), which has been
technically revised.
ISO 7240 consists of the following parts, under the general title Fire detection and alarm systems:
— Part 1: General and definitions
— Part 2: Control and indicating equipment
— Part 3: Audible alarm devices
— Part 4: Power supply equipment
— Part 5: Point-type heat detectors
— Part 6: Carbon monoxide fire detectors
...