ISO 7240-22:2007

Fire detection and alarm systems - Part 22: Smoke-detection equipment for ducts

ISO 7240-22:2007 specifies requirements, test methods and performance criteria for smoke detection equipment for ducts (s.d.e.d.) for use in fire-detection and fire alarm systems installed in buildings. The s.d.e.d. samples the air from a duct and detects smoke in the sample. A common method of operation is to use differential pressure arising from airflow in the duct. The s.d.e.d. can use smoke detectors complying with ISO 7240-7 or other detectors complying with tests specified in ISO 7240-22:2007. A common application for s.d.e.d. is to detect visible smoke, for which detectors using scattered light or transmitted light can be more suitable. However, requirements for detectors using ionization are also included in ISO 7240-22:2007 for use in applications where detection of less visible fire aerosols is desired. For the testing of other types of smoke detectors or smoke detectors working on different principles, ISO 7240-22:2007 can be used for guidance. Smoke detectors with special characteristics, developed for specific risks, are not covered.

Systèmes de détection et d'alarme d'incendie — Partie 22: Équipement de détection des fumées dans les conduits

General Information

• Status: Withdrawn
• Publication Date: 06-May-2007
• Withdrawal Date: 06-May-2007
• 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 - Fire detection and alarm systems
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 05-Sep-2017
• Completion Date: 13-Dec-2025

Relations

• Revised: ISO 7240-22:2017 - Fire detection and alarm systems - Part 22: Smoke-detection equipment for ducts
• Effective Date: 04-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7240-22
First edition
2007-05-15
Fire detection and alarm systems —
Part 22:
Smoke-detection equipment for ducts
Systèmes de détection et d'alarme d'incendie —
Partie 22: Équipement de détection des fumées dans les conduits

Reference number
©
ISO 2007
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©  ISO 2007
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ii © ISO 2007 – All rights reserved

Contents Page
Foreword. iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 General requirements. 2
4.1 Compliance. 2
4.2 Visual 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 Marking . 3
4.8 Data . 4
4.9 Requirements for software-controlled smoke-detection equipment for ducts. 4
5 Tests. 5
5.1 General. 5
5.2 Repeatability. 8
5.3 Reproducibility. 8
5.4 Variation in supply parameters . 8
5.5 Dazzling . 9
5.6 Dry heat (operational). 10
5.7 Cold (operational) . 11
5.8 Damp heat, steady state (operational). 12
5.9 Damp heat, steady state (endurance). 12
5.10 Sulfur dioxide, SO , corrosion (endurance). 13
5.11 Shock (operational) . 14
5.12 Impact (operational). 15
5.13 Vibration, sinusoidal (operational). 16
5.14 Vibration, sinusoidal (endurance). 17
5.15 Air leakage. 18
5.16 Electromagnetic compatibility (EMC) immunity tests (operational). 19
5.17 Fire sensitivity. 20
6 Test report . 21
Annex A (normative) Smoke tunnel and fire test room arrangement for response measurements . 23
Annex B (normative) Test aerosol for response threshold value measurements. 24
Annex C (normative) Smoke-measuring instruments. 25
Annex D (normative) Apparatus for dazzling test. 29
Annex E (normative) Apparatus for impact test . 30
Annex F (informative) Air-leakage test apparatus . 32
Annex G (normative) Smouldering (pyrolysis) wood fire (TF2). 33
Annex H (normative) Flaming plastics (polyurethane) fire (TF4) . 35
Annex I (informative) Information concerning the construction of the smoke tunnel. 37
Annex J (informative) Information concerning the construction of the measuring
ionization chamber . 40

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 committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 7240-22 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 3, Fire detection and alarm systems.
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 4: Power supply equipment
⎯ Part 5: Point-type heat detectors
⎯ Part 6: Carbon monoxide fire detectors using electro-chemical cells
⎯ Part 7: Point-type smoke detectors using scattered light, transmitted light or ionization
⎯ Part 8: Carbon monoxide fire detectors using an electro-chemical cell in combination with a heat sensor
⎯ Part 9: Test fires for fire detectors [Technical specification]
⎯ Part 10: Point-type flame detectors
⎯ Part 11: Manual call points
⎯ Part 12: Line type smoke detectors using a transmitted optical beam
⎯ Part 13: Compatibility assessment of system components
⎯ Part 14: Guidelines for drafting codes of practice for design, installation and use of fire detection and fire
alarm systems in and around buildings [Technical report]
⎯ Part 15: Point type fire detectors using scattered light, transmitted light or ionization sensors in
combination with a heat sensor
iv © ISO 2007 – All rights reserved

⎯ Part 16: Sound system control and indicating equipment
⎯ Part 19: Design, installation, commissioning and service of sound systems for emergency purposes
⎯ Part 21: Routing equipment
⎯ Part 22: Smoke-detection equipment for ducts
The following parts are under preparation:
⎯ Part 26, dealing with oil-mist detectors
⎯ Part 27, dealing with carbon fire detectors using optical or ionization smoke sensors, electrochemical cell
carbon monoxide sensors and heat sensors
⎯ Part 28, dealing with fire protection control equipment
Introduction
Smoke-detection equipment for ducts (s.d.e.d.) is used as part of a fire detection system to sample the
environment within air ducts of a building. Detection of smoke releases a signal to the connected control and
indicating equipment and can be used as a signal to an air-handling system to prevent the spread of smoke
within the building.
A fire-detection and alarm system is required to function satisfactorily not only in the event of a fire, but also
during and after exposure to conditions likely to be met in practice such as corrosion, vibration, direct impact,
indirect shock and electromagnetic interference. Some tests specified are intended to assess the performance
of the s.d.e.d. under such conditions.
The performance of s.d.e.d. is assessed from results obtained in specific tests. This part of ISO 7240 is not
intended to place any other restrictions on the design and construction of such equipment.

vi © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 7240-22:2007(E)

Fire detection and alarm systems —
Part 22:
Smoke-detection equipment for ducts
1 Scope
This part of ISO 7240 specifies requirements, test methods and performance criteria for smoke-detection
equipment for ducts (s.d.e.d.) for use in fire-detection and fire alarm systems installed in buildings; see
ISO 7240-1.
The s.d.e.d. samples the air from a duct and detects smoke in the sample.
NOTE 1 A common method of operation is to use differential pressure arising from airflow in the duct.
The s.d.e.d. can use smoke detectors complying with ISO 7240-7 or other detectors complying with tests
specified in this part of ISO 7240.
A common application for s.d.e.d. is to detect visible smoke, for which detectors using scattered light or
transmitted light can be more suitable. However, requirements for detectors using ionization are also included
in this part of ISO 7240 for use in applications where detection of less visible fire aerosols is desired.
For the testing of other types of smoke detectors or smoke detectors working on different principles, this part
of ISO 7240 can be used for guidance. Smoke detectors with special characteristics, developed for specific
risks, are not covered.
NOTE 2 Certain types of detectors contain radioactive materials. The national requirements for radiation protection
differ from country to country and are not specified in this part of ISO 7240.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 209-1, Wrought aluminium and aluminium alloys — Chemical composition and forms of products —
Part 1: Chemical composition
ISO 7240-1, Fire detection and fire alarm systems — Part 1: General and definition
ISO 7240-7:2003, Fire detection and fire alarm systems — Part 7: Point-type smoke detectors using scattered
light, transmitted light or ionization
IEC 60068-1, Environmental testing — Part 1: General and guidance
IEC 60068-2-1, Environmental testing — Part 2: Tests. Tests A: Cold
IEC 60068-2-2, Environmental testing — Part 2: Tests. Tests B: Dry heat
IEC 60068-2-6, Environmental testing — Part 2: Tests — Test Fc: Vibration (sinusoidal)
IEC 60068-2-27:1987, Environmental testing — Part 2: Test Ea and guidance: Shock
IEC 60068-2-42, Environmental testing — Part 2-42: Tests. Tests Kc: Sulphur dioxide tests for contacts and
connections
IEC 60068-2-78, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state
EN 50130-4, Alarm systems — Part 4: Electromagnetic compatibility — Product family standard: Immunity
requirements for components of fire, intruder and social alarm systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7240-1 and the following apply.
3.1
response threshold value
A
th
aerosol concentration in the proximity of the specimen at the moment that it generates a signal which
indicates the presence of smoke, when tested as specified in 5.1.5
NOTE The response threshold value may depend on signal processing in the detector and in the control and
indicating equipment.
3.2
smoke-detection equipment for ducts
s.d.e.d.
apparatus with an integral or associated point-type smoke detector that samples the air moving in a duct and
detects smoke in the sample
4 General requirements
4.1 Compliance
In order to comply with this part of ISO 7240, the s.d.e.d. shall meet the requirements in 4.2 to 4.8, which shall
be verified by visual inspection or engineering assessment, shall be tested as described in Clause 5 and shall
meet the requirements of these tests.
4.2 Visual alarm indication
Each s.d.e.d. shall be provided with a red visual indicator, by which the s.d.e.d. can be identified when the
associated detector releases an alarm and which remains illuminated until the alarm condition is reset. Where
other conditions of the s.d.e.d. can be visually indicated, they shall be clearly distinguishable from the alarm
indication, except when the s.d.e.d. is switched into a service mode. The alarm indicator may be the smoke
detector indicator provided the indicator is visible when the detector is in-situ as part of the s.d.e.d.
The visual indicator shall be visible from a distance of 6 m in an ambient light intensity up to 500 lx at an angle
of up to
a) 5° from the axis of the detector in any direction, and
b) 45° from the axis of the detector in at least one direction.
2 © ISO 2007 – All rights reserved

4.3 Connection of ancillary devices
The s.d.e.d. may provide for connections to ancillary devices (remote indicators, control relays, etc.), but
open- or short-circuit failures of these connections shall not prevent the correct operation of the s.d.e.d.
4.4 Monitoring of detachable detectors
For detachable detectors, a means shall be provided for a remote monitoring system (e.g. the control and
indicating equipment) to detect the removal of the head from the base, in order to give a fault signal.
4.5 Manufacturer's adjustments
It shall not be possible to change the manufacturer's settings except by special means (e.g. the use of a
special code or tool) or by breaking or removing a seal.
4.6 On-site adjustment of response behaviour
If there is provision for on-site adjustment of the response behaviour of the s.d.e.d., then
a) for all of the settings at which the manufacturer claims compliance with this part of ISO 7240, the s.d.e.d.
shall comply with the requirements of this part of ISO 7240 and access to the adjustment means shall be
possible only by the use of a code or special tool or by removing the s.d.e.d. from its base or mounting;
b) any setting(s) at which the manufacturer does not claim compliance with this part of ISO 7240 shall be
accessible only by the use of a code or special tool, and it shall be clearly marked on the s.d.e.d. or in the
associated data that if these setting(s) are used, the s.d.e.d. does not comply with this part of ISO 7240.
These adjustments may be carried out at the s.d.e.d., the detector or the control and indicating equipment.
4.7 Marking
Each s.d.e.d. shall be clearly marked with the following information:
a) number of this part of ISO 7240 (i.e. ISO 7240-22);
b) name or trademark of the manufacturer or supplier;
c) model designation (type or number);
d) wiring-terminal designations;
e) some mark(s) or code(s) (e.g. serial number or batch code), by which the manufacturer can identify at
least the date or batch and place of manufacture, and the version number(s) of any software contained
within the s.d.e.d.
Where any marking on the s.d.e.d. uses symbols or abbreviations not in common use, then these should be
explained in the data supplied with the device.
The marking shall be visible during installation of the s.d.e.d. and shall be accessible during maintenance.
The markings shall not be placed on screws or other easily removable parts.
4.8 Data
Either the s.d.e.d. shall be supplied with sufficient technical, installation and maintenance data to enable
correct installation and operation or, if all of this data is not supplied with each s.d.e.d. unit, reference to the
appropriate data sheet shall be given on, or with, each s.d.e.d. unit. These data shall include
⎯ the range of operating differential pressures between the inlet and outlet sampling tubes and the
recommended method for measuring the pressures,
⎯ the range of operating duct air velocities,
⎯ the range of applicable duct sizes for specific sampling tube lengths, and
⎯ the models of point smoke detectors for which the s.d.e.d. meets the requirements of this part of
ISO 7240.
NOTE Additional information can be required by organizations certifying that s.d.e.d. units produced by a
manufacturer conform to the requirements of this part of ISO 7240.
4.9 Requirements for software-controlled smoke-detection equipment for ducts
4.9.1 General
The requirements of 5.8.2 and 5.8.3 shall be met for s.d.e.d. that rely on software control in order to fulfil the
requirements of this part of ISO 7240.
4.9.2 Software documentation
4.9.2.1 The manufacturer shall submit documentation that gives an overview of the software design. This
documentation shall be in sufficient detail for the design to be inspected for compliance with this part of
ISO 7240 and shall include at least the following:
a) functional description of the main program flow (e.g. as a flow diagram or structogram) including
1) a brief description of the modules and the functions that they perform,
2) the way in which the modules interact,
3) the overall hierarchy of the program,
4) the way in which the software interacts with the hardware of the detector, and
5) the way in which the modules are called, including any interrupt processing;
b) description of which areas of memory are used for the various purposes (e.g. the program, site-specific
data and running data);
c) designation by which the software and its version can be uniquely identified.
4.9.2.2 The manufacturer shall have available detailed design documentation, which needs to be
provided only if required by the testing authority. It shall be comprised of at least the following:
a) overview of the whole system configuration, including all software and hardware components;
b) description of each module of the program, containing at least
1) the name of the module,
2) a description of the tasks performed, and
3) a description of the interfaces, including the type of data transfer, the valid data range and the
checking for valid data;
4 © ISO 2007 – All rights reserved

c) full source-code listings, as hard copy or in machine-readable form (e.g. ASCII-code), including all global
and local variables, constants and labels used, and sufficient comment for the program flow to be
recognized;
d) details of any software tools used in the design and implementation phase (e.g. CASE-Tools, Compilers
etc.).
4.9.3 Software design
In order to ensure the reliability of the s.d.e.d., the following requirements for software design shall apply.
a) The software shall have a modular structure.
b) The design of the interfaces for manually and automatically generated data shall not permit invalid data to
cause an error in the program operation.
c) The software shall be designed to avoid the occurrence of deadlock of the program flow.
4.9.4 The storage of programs and data
The program necessary to comply with this part of ISO 7240 and any preset data, such as manufacturer's
settings, shall be held in non-volatile memory. Writing to areas of memory containing this program and data
shall be possible only by the use of some special tool or code and shall not be possible during normal
operation of the detector.
Site-specific data shall be held in memory that retains data for at least two weeks without external power to
the s.d.e.d., unless provision is made for the automatic renewal of such data, following loss of power, within
1 h of power being restored.
5 Tests
5.1 General
5.1.1 Atmospheric conditions for tests
Unless otherwise stated in a test procedure, the testing shall be carried out after the test specimen has been
allowed to stabilize in the standard atmospheric conditions for testing as described in IEC 60068-1 as follows:
⎯ temperature: (15 to 35) °C;
⎯ relative humidity: (25 to 75) %;
⎯ air pressure: (86 to 106) kPa.
The temperature and humidity shall be substantially constant for each environmental test where the standard
atmospheric conditions are applied.
5.1.2 Operating conditions for tests
If a test method requires a specimen to be operational, then the specimen shall be connected to suitable
supply and monitoring equipment with characteristics as required by the manufacturer's data. Unless
otherwise specified in the test method, the supply parameters applied to the specimen shall be set within the
manufacturer's specified range(s) and shall remain substantially constant throughout the tests. The value
chosen for each parameter shall normally be the nominal value or the mean of the specified range. If a test
procedure requires a specimen to be monitored to detect any alarm or fault signals, then connections shall be
made to any necessary ancillary devices (e.g. through wiring to an end-of-line device for collective detectors)
to allow a fault signal to be recognized.
The details of the supply and monitoring equipment and the alarm criteria used shall be given in the test report
(Clause 6).
5.1.3 Mounting arrangements
Mount the specimen by its normal means of attachment in accordance with the manufacturer's instructions. If
these instructions describe more than one method of mounting, then the method considered to be least
favourable shall be chosen for each test.
5.1.4 Tolerances
Unless otherwise stated, the tolerances for the environmental test parameters shall be as given in the basic
reference standards for the test (e.g. the relevant part of IEC 60068).
If a specific tolerance or deviation limit is not specified in a requirement or test procedure, then a tolerance of
± 5 % shall be applied.
5.1.5 Response threshold value
Install the specimen for which the response threshold value, A , is being measured in the smoke tunnel
th
described in Annex A, in its normal operating position, by its normal means of attachment.
NOTE This measurement can be taken only where the sampling apparatus of the s.d.e.d. can fit inside the smoke
tunnel. Where the sampling apparatus is too large, it will be necessary to agree other arrangements with the manufacturer.
Before commencing each measurement, purge the smoke tunnel to ensure that the tunnel and the specimen
are free from the test aerosol.
Unless otherwise specified in the test procedure, the air temperature in the tunnel shall be (23 ± 5) °C and
shall not vary by more than 5 K for all the measurements on a particular s.d.e.d. type.
Connect the specimen to its supply and monitoring equipment as specified in 5.1.2, and allow it to stabilize for a
period of at least 15 min, unless otherwise specified by the manufacturer.
Introduce the test aerosol, as specified in Annex B, into the tunnel such that the rate of increase of aerosol
density is as follows:
⎯ for s.d.e.d. incorporating detectors using scattered or transmitted light, in decibels per metre per minute:
∆m
0,015uu 0,1;
∆t
∆y
⎯ for s.d.e.d. incorporating detectors using ionization, per minute: 0,05uu 0,3 .
∆t
NOTE These ranges are intended to allow the selection of a convenient rate, depending upon the sensitivity of the
s.d.e.d., so that a response can be obtained in a reasonable time.
The rate of increase in aerosol density shall be similar for all measurements on a particular s.d.e.d. type.
Conduct tests on the s.d.e.d. specimen at each of the following air velocities:
a) the minimum specified by the manufacturer,
b) the maximum specified by the manufacturer, and
c) the mean of the minimum and maximum.
The response threshold value is the aerosol density (in terms of m or y) at the moment that the specimen
gives an alarm at each air velocity. This shall be recorded as m, expressed in decibels per metre, for detectors
using scattered or transmitted light, or as y for detectors using ionization (see Annex C).
Designate the greater of the response threshold value as y or m for each air velocity; the lesser as y
max max min
or m for each air velocity.
min
6 © ISO 2007 – All rights reserved

5.1.6 Provision for tests
The following shall be provided for testing compliance with this part of ISO 7240:
a) 13 s.d.e.d. specimens;
b) data required in 4.7.
The specimens submitted shall be deemed representative of the manufacturer's normal production with
regard to their construction and calibration. This implies that the mean response threshold value of the twelve
specimens found in the reproducibility test (5.3) should also represent the production mean, and that the limits
specified in the response threshold value test should also be applicable to the manufacturer's production.
5.1.7 Test schedule
The specimens shall be tested according to the test schedule given in Table 1. After the reproducibility test,
number the two least sensitive specimens (i.e. those with the highest response thresholds) 12 and 13, and the
others 1 to 11 arbitrarily.
Table 1 — Test schedule
Test Subclause Specimen number(s)

Repeatability 5.2 One chosen arbitrarily

Reproducibility 5.3 All specimens
a
Variation of supply parameters 5.4 1
b
Dazzling 5.5 2
Dry heat (operational) 5.6 3
Cold (operational) 5.7 4
Damp heat, steady state (operational) 5.8 5
Damp heat, steady state (endurance) 5.9 6
Sulfur dioxide, SO , corrosion (endurance) 5.10 7
Shock (operational) 5.11 8
Impact (operational) 5.12 9
Vibration, sinusoidal (operational) 5.13 10
Vibration, sinusoidal (endurance) 5.14 10
c
Air leakage 5.15 7, 10
Electromagnetic compatibility (EMC), Immunity tests (operational) 5.16 11
Fire sensitivity 5.17 12, 13
a
This test duplicates a test undertaken as part of the assessment of point type smoke detectors for conformance to ISO 7240-7.
Where the s.d.e.d. includes a smoke detector conforming to ISO 7240-7 and does not include any additional active electronic
components, this test may be omitted.
b
This test only applies to detectors using scattered or transmitted light principle of operation. Where the s.d.e.d. includes a smoke
detector conforming to ISO 7240-7 or the sensing element is mounted within an opaque enclosure, this test may be omitted.
c
Air leakage test is undertaken after the corrosion test and the vibration tests.

5.1.8 Test report
The test results shall be reported in accordance with Clause 6.
5.2 Repeatability
5.2.1 Object of test
To show that the s.d.e.d. has stable behaviour with respect to its sensitivity even after a number of alarm
conditions.
5.2.2 Test procedure
Measure the response threshold value of the specimen to be tested six times for each air velocity as specified
in 5.1.5.
Designate the maximum response threshold value as y or m for each air velocity, the minimum value as
max max
y or m for each air velocity.
min min
5.2.3 Requirements
The ratio of the response threshold values, y : y or m : m , shall be not greater than 1,6 for each air
max min max min
velocity.
The lower response threshold value, y , shall be not less than 0,2, or m shall be not less than 0,05 dB/m.
min min
5.3 Reproducibility
5.3.1 Object of test
To show that the sensitivity of the s.d.e.d. does not vary unduly from specimen to specimen and to establish
response threshold value data for comparison with the response threshold values measured after the
environmental tests.
5.3.2 Test procedure
Measure the response threshold value of each of the test specimens for each air velocity as specified in 5.1.5.
Calculate the mean of these response threshold values for each air velocity, which shall be designated y
or m .
Designate the maximum response threshold value as y or m for each air velocity, the minimum value as
max max
y or m for each air velocity.
min min
5.3.3 Requirements
The ratio of the response threshold values, y : y or m : m , shall be not greater than 1,33 for each air
max max
velocity, and the ratio of the response threshold values, y : y or m : m , shall be not greater than 1,5 for
min min
each air velocity.
The lower response threshold value, y , shall be not less than 0,2, or m shall be not less than 0,05 dB/m.
min min
5.4 Variation in supply parameters
5.4.1 Object of test
To show that, within the specified range(s) of the supply parameters (e.g. voltage), the sensitivity of the s.d.e.d.
is not unduly dependent on these parameters.
8 © ISO 2007 – All rights reserved

5.4.2 Test procedure
At the mean air velocity specified in 5.1.5, measure the response threshold value of the specimen as specified
in 5.1.5, at the upper and lower limits of the supply parameter (e.g. voltage) range(s) specified by the
manufacturer.
Designate the greater of the response threshold value as y or m ; the lesser as y or m .
max max min min
NOTE For collective (conventional) detectors, the supply parameter is the d.c. voltage applied to the detector. For
other types of detector (e.g. analogue addressable), it can be necessary to consider signal levels and timing. If necessary,
the manufacturer can be requested to provide suitable supply equipment to allow the supply parameters to be changed as
required.
5.4.3 Requirements
The ratio of the response threshold values, y : y or m : m , shall not be greater than 1,6.
max min max min
The lower response threshold value, y , shall be not less than 0,2, or m shall be not less than 0,05 dB/m.
min min
5.5 Dazzling
5.5.1 Object of test
To show that the sensitivity of the s.d.e.d. is not unduly influenced by the close proximity of artificial light
sources. This test is applied only to s.d.e.d. with detectors using scattered light or transmitted light, as
detectors using ionization are considered unlikely to be influenced.
5.5.2 Test procedure
Mount the specimen as specified in 5.1.3 and connect it to supply and monitoring equipment as specified in
5.1.2. Install the dazzling apparatus (see Annex D) over the portion of the specimen mounted outside the duct,
such that the smoke-sensing element and housing are fully enclosed by the apparatus. Perform the following
procedure.
a) At the mean air velocity specified in 5.1.5, measure the response threshold value as specified in 5.1.5.
b) Switch the five lamps ON simultaneously for 10 s and then OFF for 10 s. Repeat this ten times.
c) Switch the five lamps ON again and, after at least 1 min, measure the response threshold value as
specified in 5.1.5, with the lamps ON.
d) Then switch the five lamps OFF.
Designate the maximum response threshold value as m and the minimum response threshold value as
max
m .
min
5.5.3 Requirements
During the periods when the lamps are being switched ON and OFF, and when the lamps are ON before the
response threshold value is measured, the specimen shall not emit either an alarm or a fault signal.
The ratio of the response thresholds, m : m , shall be not greater than 1,6.
max min
5.6 Dry heat (operational)
5.6.1 Object of test
To demonstrate the ability of the s.d.e.d. to function correctly at high ambient temperatures that may occur for
short periods in the service environment.
5.6.2 Test procedure
5.6.2.1 Reference
Use the test apparatus and perform the procedure as specified in IEC 60068-2-2, Test Bb, and in 5.6.2.2 to
5.6.2.4.
5.6.2.2 State of specimen during conditioning
Mount the specimen being tested as specified in 5.1.3 in the smoke tunnel (see Annex A) and connect it to its
supply and monitoring equipment as specified in 5.1.2.
5.6.2.3 Conditioning
Apply the following conditioning:
⎯ tunnel air velocity: maximum is specified by the manufacturer;
⎯ temperature: starting at an initial air temperature of (23 ± 5) °C, increase the air temperature in
the smoke tunnel to (55 ± 2) °C;
⎯ duration: maintain this temperature for 2 h.
NOTE Test Bb specifies rates of change of temperature of < 1 °C/min for the transitions to and from the conditioning
temperature.
5.6.2.4 Measurements during conditioning
Monitor the specimen during the conditioning period to detect any alarm or fault signals.
5.6.2.5 Final measurements
Measure the response threshold value at the maximum air velocity as specified in 5.1.5, but at a temperature
of (55 ± 2) °C.
Designate the greater of the response threshold value measured in this test and that measured for the same
specimen in the reproducibility test as y or m and the lesser as y or m .
max max min min
5.6.3 Requirements
No alarm or fault signals shall be given during the period that the temperature is increasing to the conditioning
temperature or during the conditioning period until the response threshold value is measured.
The ratio of the response threshold values, y : y or m : m , shall be not greater than 1,6.
max min max min
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5.7 Cold (operational)
5.7.1 Object of test
To demonstrate the ability of the s.d.e.d. to function correctly at low ambient temperatures appropriate to the
anticipated service environment.
5.7.2 Test procedure
5.7.2.1 Reference
Use the test apparatus and perform the procedure as specified in IEC 60068-2-1, Test Ab, and in 5.7.2.2 to
5.7.2.5.
5.7.2.2 State of specimen during conditioning
Mount the specimen as specified in 5.1.3 and connect it to supply and monitoring equipment as specified in
5.1.2.
5.7.2.3 Conditioning
Apply the following conditioning:
⎯ tunnel air velocity: maximum is specified by the manufacturer;
⎯ temperature: starting at an initial temperature of (23 ± 5) °C, decrease the air temperature in the
smoke tunnel to (−10 ± 3) °C;
⎯ duration: 16 h.
NOTE Test Ab specifies rates of change of temperature of < 1 °C/min for the transitions to and from the conditioning
temperature.
5.7.2.4 Measurements during conditioning
Monitor the specimen during the conditioning period to detect any alarm or fault signals.
5.7.2.5 Final measurements
After a recovery period of at least 1 h at the standard atmospheric conditions, measure the response threshold
value at the mean air velocity specified in 5.1.5.
Designate the greater of the response threshold value measured in this test and that measured for the same
specimen in the reproducibility test as y or m and the lesser as y or m .
max max min min
5.7.3 Requirements
No alarm or fault signals shall be given during the transition to or the period at the conditioning temperature.
The ratio of the response threshold values, y : y or m : m , shall not be greater than 1,6.
max min max min
5.8 Damp heat, steady state (operational)
5.8.1 Object of test
To demonstrate the ability of the s.d.e.d. to function correctly at high relative humidity (without condensation),
which can occur for short periods in the anticipated service environment.
5.8.2 Test procedure
5.8.2.1 Reference
Use the test apparatus and perform the procedure as specified in IEC 60068-2-78, Test Cab, and in 5.8.2.2 to
5.8.2.5.
5.8.2.2 State of the specimen during conditioning
Mount the specimen as specified in 5.1.3 and connect it to supply and monitoring equipment as specified in
5.1.2.
5.8.2.3 Conditioning
Apply the following conditioning:
⎯ tunnel air velocity: maximum specified by the manufacturer;
⎯ temperature: (40 ± 2) °C in the smoke tunnel;
⎯ relative humidity: (93 ± 3) % in the smoke tunnel;
⎯ duration: 4 d.
5.8.2.4 Measurements during conditioning
Monitor the specimen during the conditioning period to detect any alarm or fault signals.
5.8.2.5 Final measurements
After a recovery period of at least 1 h at the standard atmospheric conditions, measure the response threshold
value at the mean air velocity as specified in 5.1.5.
Designate the greater of the response threshold value measured in this test and that measured for the same
specimen in the reproducibility test as y or m and the lesser as y or m .
max max min min
5.8.3 Requirements
No alarm or fault signals shall be given during the conditioning.
The ratio of the response threshold values, y : y or m : m , shall be not greater than 1,6.
max min max min
5.9 Damp heat, steady state (endurance)
5.9.1 Object of test
To demonstrate the ability of the s.d.e.d. to withstand the long-term effects of humidity in the service
environment (e.g. changes in electrical properties of materials, chemical reactions involving moisture, galvanic
corrosion).
12 © ISO 2007 – All rights reserved

5.9.2 Test procedure
5.9.2.1 Reference
Use the test apparatus and perform the procedure as specified in IEC 60068-2-78, Test Cab, and in 5.9.2.2 to
5.9.2.4.
5.9.2.2 State of the specimen during conditioning
Mount the specimen as specified in 5.1.3. Do not supply it with power during the conditioning.
NOTE As power is not supplied to the specimen during conditioning, it is not necessary to mount the specimen in the
smoke tunnel and it can be mounted on a plate simulating the smoke tunnel wall.
5.9.2.3 Conditioning
Apply the following conditioning to the whole of the s.d.e.d., including any portion that might not normally be
mounted inside a duct:
⎯ temperature: (40 ± 2) °C;
⎯ relative humidity: (93 ± 3) %;
⎯ duration: 21 d.
5.9.2.4 Final measurements
After a recovery period of at least 1 h in standard atmospheric conditions, measure the response threshold
value at the mean air velocity as specified in 5.1.5.
Designate the greater of the response threshold value measured in this test and that measured for the same
specimen in the reproducibility test as y or m and the lesser as y or m .
max max min min
5.9.3 Requirements
No fault signal attributable to the endurance conditioning shall be given on reconnection of the specimen.
The ratio of the response threshold values, y : y or m : m , shall be not greater than 1,6.
max min max min
5.10 Sulfur dioxide, SO , corrosion (endurance)
5.10.1 Object of test
To demonstrate the ability of the s.d.e.d to withstand the corrosive effects of sulfur dioxide as an atmospheric
pollutant.
5.10.2 Test procedure
5.10.2.1 Reference
Use the test apparatus and perform the procedure generally as specified in IEC 60068-2-42: Test Kc, but
carry out the conditioning as specified in 5.10.2.3.
5.10.2.2 State of the specimen during conditioning
Mount the specimen as specified in 5.1.3. Do not supply it with power during the conditioning, but equip it with
untinned copper wires, of the appropriate diameter, connected to sufficient terminals to allow the final
measurement to be made, without making further connections to the specimen.
NOTE As power is not supplied to the specimen during conditioning, it is not necessary to mount the specimen in the
smoke tunnel and it can be mounted on a plate simulating the smoke tunnel wall.
5.10.2.3 Conditioning
Apply the following conditioning to the whole of the s.d.e.d., including any portion that may not normally be
mounted inside a duct:
⎯ temperature: (25 ± 2) °C;
⎯ relative humidity: (93 ± 3) %;
⎯ SO concentration: (25 ± 5) µl/l;
⎯ duration: 21 d.
5.10.2.4 Final measurements
Immediately after the conditioning, subject the specimen to a drying period of 16 h at (40 ± 2) °C, u 50 % RH,
followed by a recovery period of at least 1 h at the
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