SIST EN 54-27:2015

SLOVENSKI STANDARD
01-maj-2015
6LVWHPL]DRGNULYDQMHLQMDYOMDQMHSRåDUDWHUDODUPLUDQMHGHO'LPQLMDYOMDOQLN
]DSUH]UDþHYDOQHNDQDOH
Fire detection and fire alarms systems - Part 27: Duct smoke detectors
Brandmeldeanlagen - Teil 27: Rauchmelder für die Überwachung von Lüftungsleitungen
Systèmes de détection et d'alarme incendie - Partie 27 : Détecteurs de fumées dans les
conduits
Ta slovenski standard je istoveten z: EN 54-27:2015
ICS:
13.220.20 3RåDUQD]DãþLWD Fire protection
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 54-27
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2015
ICS 13.220.20
English Version
Fire detection and fire alarms systems - Part 27: Duct smoke
detectors
Systèmes de détection et d'alarme incendie - Partie 27 : Brandmeldeanlagen - Teil 27: Rauchmelder für die
Détecteurs de fumées dans les conduits Überwachung von Lüftungsleitungen
This European Standard was approved by CEN on 11 January 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 54-27:2015 E
worldwide for CEN national Members.

Contents Page
Foreword .5
Introduction .7
1 Scope .8
2 Normative references .8
3 Terms, abbreviated terms and definitions .9
3.1 Terms and definitions .9
3.2 Abbreviated terms . 10
4 Requirements . 10
4.1 General . 10
4.2 Nominal activation conditions/sensitivity . 10
4.2.1 Individual alarm indication . 10
4.2.2 Additional visual indication (option with requirement) . 10
4.2.3 Alarm resetting for stand-alone systems (option with requirement) . 11
4.2.4 Connection of ancillary devices (option with requirement) . 11
4.2.5 Response to slowly developing fires. 11
4.2.6 Dazzling . 11
4.3 Operational reliability . 11
4.3.1 Repeatability . 11
4.3.2 Reproducibility . 11
4.3.3 On-site adjustment of response behaviour . 11
4.3.4 Manufacturer's adjustments . 12
4.3.5 Monitoring of detachable detectors . 12
4.3.6 Software controlled detectors (when provided) . 12
4.4 Tolerance to supply voltage — Variation in supply parameters . 13
4.5 Performance parameters under fire conditions — Fire sensitivity . 13
4.6 Durability of Nominal activation conditions/sensitivity . 13
4.6.1 Temperature resistance . 13
4.6.2 Humidity resistance . 14
4.6.3 Corrosion resistance — Sulfur dioxide (SO ) corrosion (endurance) . 14
4.6.4 Shock and vibration resistance . 14
4.6.5 Electrical stability — EMC, immunity tests (operational) . 14
4.6.6 Air leakage . 14
5 Testing, assessment and sampling methods . 15
5.1 General . 15
5.1.1 Atmospheric conditions for tests . 15
5.1.2 Operating conditions for tests . 15
5.1.3 Mounting arrangements . 15
5.1.4 Tolerances . 15
5.1.5 Response threshold value . 16
5.1.6 Provision for tests . 16
5.1.7 Reduced function tests . 17
5.1.8 Test schedule . 17
5.2 Nominal activation conditions/sensitivity . 18
5.2.1 Individual alarm indication . 18
5.2.2 Additional visual indication (when provided) . 18
5.2.3 Alarm resetting for stand-alone system (when provided) . 18
5.2.4 Connection of ancillary devices (when provided) . 18
5.2.5 Response to slowly developing fires . 18
5.2.6 Dazzling . 18
5.3 Operational reliability . 19
5.3.1 Repeatability . 19
5.3.2 Reproducibility . 20
5.3.3 On-site adjustment of response behaviour . 20
5.3.4 Manufacturer's adjustments . 20
5.3.5 Monitoring of detachable detectors . 20
5.3.6 Software controlled devices . 20
5.4 Tolerance to supply voltage . 20
5.4.1 Variation in supply parameters . 20
5.5 Performance parameters under fire conditions . 21
5.5.1 Fire sensitivity . 21
5.6 Durability of Nominal activation conditions/sensitivity . 23
5.6.1 Temperature resistance . 23
5.6.2 Humidity resistance . 25
5.6.3 Corrosion resistance — Sulfur dioxide (SO ) corrosion (endurance) . 27
5.6.4 Shock and vibration resistance . 28
5.6.5 Electrical stability . 32
5.6.6 Air leakage . 33
6 Assessment and verification of constancy of performance (AVCP) . 34
6.1 General . 34
6.2 Type testing . 34
6.2.1 General . 34
6.2.2 Test samples, testing and compliance criteria . 35
6.2.3 Test reports . 35
6.3 Factory production control (FPC) . 35
6.3.1 General . 35
6.3.2 Requirements . 36
6.3.3 Product specific requirements . 38
6.3.4 Initial inspection of factory and FPC . 39
6.3.5 Continuous surveillance of FPC . 39
6.3.6 Procedure for modifications. 40
6.3.7 One-off products, pre-production products, (e.g. prototypes) and products produced in

very low quantities . 40
7 Classification . 40
8 Marking, labelling and packaging . 41
9 Data . 41
Annex A (normative) Aerosol tunnel arrangement for response measurements . 42
Annex B (normative) Test aerosol for response threshold value measurements . 43
Annex C (normative) Smoke measuring instruments . 44
Annex D (normative) Apparatus for dazzling test . 48
Annex E (normative) Fire test room and working volume arrangements for fire tests . 49
Annex F (normative) Smouldering (pyrolysis) wood fire (TF2D) . 51
Annex G (normative) Flaming plastics (polyurethane) fire (TF4D) . 54
Annex H (normative) Low temperature black smoke (decaline) liquid fire (TF8D) . 56
Annex I (informative) Information concerning the construction of the tunnel for fire tests . 59
Annex J (informative) Information concerning the construction of the measuring ionization

chamber . 61
Annex K (informative) Information about DSD used as a stand-alone system. 64
Annex L (informative) Power supply . 65
Annex M (informative) Information concerning test procedures and requirements for the

response to slowly developing fires . 66
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU

Construction Products Regulation . 70
ZA.1 Scope and relevant characteristics . 70
ZA.2 Procedure for assessment and verification of constancy of performance (AVCP) of duct

smoke detectors . 72
ZA.2.1 System of AVCP . 72
ZA.2.2 Declaration of performance (DoP) . 73
ZA.3 CE marking and labelling . 78
Bibliography . 81

Foreword
This document (EN 54-27:2015) has been prepared by Technical Committee CEN/TC 72 “Fire detection and
fire alarm systems”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2015 and conflicting national standards shall be withdrawn
at the latest by March 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports basic requirements of EU Regulation 305/2011.
For relationship with EU Regulation(s), see informative Annex ZA, which is an integral part of this document.
Information on the relationship between this European Standard and other standards of the EN 54 series is
given in EN 54-1.
EN 54, Fire detection and fire alarm systems, consists of the following parts:
— Part 1: Introduction;
— Part 2: Control and indicating equipment;
— Part 3: Fire alarm devices — Sounders;
— Part 4: Power supply equipment;
— Part 5: Heat detectors — Point detectors;
— Part 7: Smoke detectors — Point detectors using scattered light, transmitted light or ionization;
— Part 10: Flame detector — Point detectors;
— Part 11: Manual call points;
— Part 12: Smoke detectors — Line detectors using an optical light beam;
— Part 13: Compatibility assessment of system components;
— Part 14: Guidelines for planning, design, installation, commissioning, use and maintenance [CEN
Technical specification];
— Part 16: Voice alarm control and indicating equipment;
— Part 17: Short circuit isolators;
— Part 18: Input/output devices;
— Part 20: Aspirating smoke detectors;
— Part 21: Alarm transmission and fault warning routing equipment;
— Part 22: Resettable line type heat detectors;
— Part 23 Fire alarm devices — Visual alarm devices;
— Part 24: Components of voice alarm systems — Loudspeakers;
— Part 25: Components using radio links;
— Part 26: Point fire detectors using carbon monoxide sensors;
— Part 27: Duct smoke detectors [the present document];
— Part 28: Non-resettable line type heat detectors;
— Part 29: Multi-sensor fire detectors — Point detectors using a combination of smoke and heat sensors;
— Part 30: Multi-sensor fire detectors — Point detectors using a combination of carbon monoxide and heat
sensors;
— Part 31: Multi-sensor fire detectors — Point detectors using a combination of smoke, carbon monoxide
and optionally heat sensors.
NOTE This list includes standards that are in preparation and other standards may be added. For current status of
published standards refer to www.cen.eu.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Introduction
Duct smoke detectors (DSD) are used as part of a fire detection and fire alarm system or as a stand-alone
actuator for a fire protection system to sample the air within air ducts of a building. Detection of smoke can be
used as 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 DSD is required to function satisfactorily not only in the event of a fire, but also in the 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 DSD under such conditions.
The performance of DSD is assessed from results obtained in specific tests. This document is not intended to
place any other restrictions on the design and construction of such equipment.
An example for a stand-alone system is given in Figure K.1. The configuration of a fire detection and fire alarm
system is given in EN 54-1.
Annex L gives information on power supply. These requirements are system requirements or requirements on
other components respectively and do not concern the product requirements of the DSD.
1 Scope
This European Standard specifies requirements, test methods and performance criteria for fire detectors
which detect smoke in air ducts in buildings as a part of a fire detection and fire alarm system or as an
actuator for a fire protection system.
Duct smoke detectors with special characteristics and developed for specific risks are not covered by this
document.
NOTE Certain types of detector contain radioactive materials. The national requirements for radiation protection differ
from one member state to another and are not specified in this standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 54-1:2011, Fire detection and fire alarm systems - Part 1: Introduction
1)
EN 54-7:2000, Fire detection and fire alarm systems - Part 7: Smoke detectors - Point detectors using
scattered light, transmitted light or ionization
EN 54-13:2005, Fire detection and fire alarm systems - Part 13: Compatibility assessment of system
components
2)
EN 54-20:2006, Fire detection and fire alarm systems - Part 20: Aspirating smoke detectors
EN 50130-4:2011, Alarm systems - Part 4: Electromagnetic compatibility - Product family standard: Immunity
requirements for components of fire, intruder, hold up, CCTV, access control and social alarm systems
EN 60068-1:2014, Environmental testing - Part 1: General and guidance (IEC 60068-1:1988)
EN 60068-2-1:2007, Environmental testing - Part 2-1: Tests - Test A: Cold (IEC 60068-2-1:2007)
EN 60068-2-2:2007, Environmental testing - Part 2-2: Tests - Test B: Dry heat (IEC 60068-2-2:2007)
EN 60068-2-6:2008, Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)(IEC 60068-2-
6:2007)
EN 60068-2-27:2009, Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock (IEC 60068-2-
27:2008)
EN 60068-2-42:2003, Environmental testing - Part 2-42: Tests - Test Kc: Sulphur dioxide test for contacts and
connections (IEC 60068-2-42:2003)
EN 60068-2-75:2014, Environmental testing - Part 2-75: Tests - Test Eh: Hammer tests (IEC 60068-2-
75:2014)
1 ) EN 54-7:2000 is currently impacted by the stand-alone amendments EN 54-7:2000/A1:2002 and EN 54-
7:2000/A2:2006.
2) EN 54-20:2006 is currently impacted by the corrigendum EN 54-20:2006/AC:2008.
EN 60068-2-78:2013, Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state
(IEC 60068-2-78:2012)
3 Terms, abbreviated terms and definitions
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 54-1:2011, EN 54-13:2005 and the
following apply.
3.1.1
duct smoke detector
fire detector that monitors the air in an air duct to detect smoke
Note 1 to entry: The combination with additional sensors for different fire phenomena is possible.
3.1.2
response threshold value
aerosol concentration within the duct in the proximity of the specimen at the moment that it generates an
alarm signal
Note 1 to entry: The response threshold value can depend on signal processing in the detector and in the control and
indicating equipment.
3.1.3
type 1 DSD
point smoke detector mounted inside the duct
3.1.4
type 2 DSD
point smoke detector mounted inside the duct with additional electrical components
Note 1 to entry: Additional electrical components, e.g. visual indicators are not covered by EN 54 standards. Their
functions are described e.g. in 4.2.1, 4.2.2, and 4.2.3.
3.1.5
type 3 DSD
point smoke detector mounted outside the duct with additional mechanical means to sample the air
3.1.6
type 4 DSD
point smoke detector mounted outside the duct with additional mechanical means to sample the air and with
additional electrical components
Note 1 to entry: Additional electrical components, e.g. visual indicators are not covered by EN 54 standards. Their
functions are described e.g. in 4.2.1, 4.2.2, and 4.2.3.
3.1.7
type 5 DSD
aspirating smoke detector with all sampling points inside the duct
3.1.8
type 6 DSD
other types of DSD not complying with type 1 to type 5
Note 1 to entry: This type 6 DSD includes detectors based on EN 54–7 or EN 54–20 with modified sensitivity settings.
3.2 Abbreviated terms
ASD Aspirating smoke detector
CIE Control and indicating equipment
DSD Duct smoke detector
FDAS Fire detection and fire alarm system
FPC Factory production control
FPS Fire protection system
4 Requirements
4.1 General
4.1.1 Duct smoke detectors shall incorporate at least one smoke sensor. The combination with additional
sensors for different fire phenomena can be used.
If additional fire sensors for different fire phenomena are implemented in a DSD, these sensors shall be
approved in accordance with the corresponding EN 54 standards.
The manufacturer shall specify whether the DSD can directly be used as an actuator for fire protection
systems, i.e. stand-alone system or as a part of a FDAS.
The requirements of this clause shall be applied for all six types of DSD. The relevant tests for the different
types of DSD are described in Clause 5.
For type 1 DSD to type 4 DSD, the point smoke detector shall be approved to EN 54-7. Otherwise the DSD
shall be assessed like a type 6 DSD.
For type 5 DSD, the ASD shall be approved to EN 54-20; otherwise the DSD shall be assessed like a
type 6 DSD.
4.1.2 Compliance:
To comply with this standard the DSD shall meet the requirements of Clause 4 which shall be verified by
visual inspection or engineering assessment and shall be tested as described in Clause 5 and shall meet the
requirements of the tests.
4.2 Nominal activation conditions/sensitivity
4.2.1 Individual alarm indication
Each DSD shall be provided with a red visual indicator, by which the DSD can be identified when the
associated detector releases an alarm, until the alarm condition is reset manually. Where other conditions of
the DSD can be visually indicated, they shall be clearly distinguishable from the alarm indication, except when
the DSD is switched into a service mode. The visual indicator shall be visible from outside of the duct from a
distance of 6 m in an ambient light intensity up to 500 lx in at least one direction from the DSD. The visual
indicator may be integral part of the DSD or remote from DSD.
4.2.2 Additional visual indication (option with requirement)
If the DSD is used as an actuator for a FPS, i.e. stand-alone system then the DSD shall be provided with
additional indicators yellow for “fault” and green for “power on”. Additional indicators may be integral part of
the DSD or remote from DSD.
For operated DSD the additional visual indicator shall be visible from outside of the duct from a distance of
6 m in an ambient light intensity up to 500 lx in at least one direction from the DSD.
4.2.3 Alarm resetting for stand-alone systems (option with requirement)
If the DSD is used as an actuator for a FPS, i.e. stand-alone system then the DSD shall be provided with
means for manual resetting. Means for resetting may be integral part of the DSD or remote from DSD.
4.2.4 Connection of ancillary devices (option with requirement)
For all connections to ancillary devices (remote indicators, control relays etc.), open- or short-circuit failures of
these connections shall not prevent the correct operation of the DSD.
Where such connections are present the detector shall be assessed in accordance with 5.2.4.
4.2.5 Response to slowly developing fires
For type 1 DSD to type 5 DSD the requirements as given in EN 54-7 and EN 54-20 respectively shall be
applied. For type 6 DSD the manufacturer shall specify with which of these European Standards the DSD
complies.
4.2.6 Dazzling
The sensitivity of the DSD shall not be unduly influenced by the close proximity of artificial light sources. To
confirm this, the detector shall be assessed in accordance with 5.2.6. This test is only applicable to detectors
using optical smoke sensors, as ionization chamber detectors are considered unlikely to be influenced.
4.3 Operational reliability
4.3.1 Repeatability
The detector shall have stable behaviour with respect to its sensitivity to smoke after a number of alarm
conditions. To confirm this, the detector shall be assessed in accordance with 5.3.1.
4.3.2 Reproducibility
The sensitivity of the detector to smoke shall not vary unduly from specimen to specimen. To confirm this, the
detector shall be assessed in accordance with 5.3.2.
4.3.3 On-site adjustment of response behaviour
If there is provision for on-site adjustment of the response behaviour of the detector then:
— for each setting at which the manufacturer claims compliance with this standard, the detector shall comply
with the requirements of this standard, and access to the adjustment means shall only be possible by the
use of a code or special tool or by removing the detector from its base or mounting;
— any setting(s) at which the manufacturer does not claim compliance with this standard, shall only be
accessible by the use of a code or special tool, and it shall be clearly marked on the detector or in the
associated data, that if these setting(s) are used, the detector does not comply with the standard.
These adjustments may be carried out at the sensor control unit or at the control and indicating equipment.
4.3.4 Manufacturer's adjustments
The DSD shall be designed so that the manufacturer's settings can only be changed by special means (e.g.
the use of a special code or tool) or by breaking or removing a seal.
4.3.5 Monitoring of detachable detectors
For detachable detectors, means shall be provided to detect the removal of the head from the base, in order
to give a fault signal.
4.3.6 Software controlled detectors (when provided)
4.3.6.1 General
DSD which rely on software control shall meet the requirements of 4.3.6.2, 4.3.6.3 and 4.3.6.4.
4.3.6.2 Software documentation
The manufacturer shall submit documentation to the test laboratory which gives an overview of the software
design. This documentation shall be in sufficient detail for the design to be inspected for compliance with this
standard and shall include at least the following:
a) 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;
5) the way in which the modules are called, including any interrupt processing.
b) a description of which areas of memory are used for the various purposes (e.g. the program, site specific
data and running data);
c) a designation, by which the software and its version can be uniquely identified.
4.3.6.3 Design detail
The manufacturer shall have available detailed design documentation, which only needs to be provided if
required by the testing authority. It shall comprise at least the following:
a) an overview of the whole system configuration, including all software and hardware components;
b) a description of each module of the program, containing at least:
1) the name of the module;
2) a description of the tasks performed;
3) a description of the interfaces, including the type of data transfer, the valid data range and the
checking for valid data;
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.).
4.3.6.4 Software design
In order to ensure the reliability of the DSD, 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 error in the program operation;
c) the software shall be designed to avoid the occurrence of deadlock of the program flow.
4.3.6.5 The storage of programs and data
The program necessary to comply with this standard and any preset data, such as manufacturer's settings,
shall be held in non-volatile memory. Areas of memory containing this program and data shall be designed
such that they can only be written to by the use of some special tool or code and not during normal operation
of the detector.
Site-specific data shall be held in memory which will retain data for at least two weeks without external power
to the DSD, unless provision is made for the automatic renewal of such data, following loss of power, within
1 h of power being restored.
4.4 Tolerance to supply voltage — Variation in supply parameters
The DSD shall function correctly within the specified range(s) of the supply parameters as specified in 5.4.1.
4.5 Performance parameters under fire conditions — Fire sensitivity
The DSD shall have adequate sensitivity to incipient type fires that may occur in buildings. To confirm this, the
DSD shall be assessed in accordance with 5.5.1.
4.6 Durability of Nominal activation conditions/sensitivity
4.6.1 Temperature resistance
4.6.1.1 Dry heat (operational)
The DSD shall function correctly at high ambient temperatures. To confirm this, the detector shall be assessed
in accordance with 5.6.1.1.
4.6.1.2 Cold (operational)
The DSD shall function correctly at low ambient temperatures. To confirm this, the detector shall be assessed
in accordance with 5.6.1.2.
4.6.2 Humidity resistance
4.6.2.1 Damp heat, steady-state (operational)
The DSD shall be capable of withstanding long term exposure to a high level of continuous humidity. To
confirm this, the DSD shall be assessed in accordance with 5.6.2.1.
4.6.2.2 Damp heat, steady-state (endurance)
The DSD shall be capable of withstanding long term exposure to a high level of continuous humidity. To
confirm this, the DSD shall be assessed in accordance with 5.6.2.2.
4.6.3 Corrosion resistance — Sulfur dioxide (SO ) corrosion (endurance)
The DSD shall be capable of withstanding the corrosive effects of sulfur dioxide as an atmospheric pollutant.
To confirm this, the sensing element shall be assessed in accordance with 5.6.3.1.
4.6.4 Shock and vibration resistance
4.6.4.1 Shock (operational)
The DSD shall function correctly when submitted to mechanical shocks which are likely to occur in the service
environment. To confirm this, the DSD shall be assessed in accordance with 5.6.4.1.
4.6.4.2 Impact (operational)
The DSD shall function correctly when submitted to mechanical impacts which it may sustain in the normal
service environment. To confirm this, the DSD shall be assessed in accordance with 5.6.4.2.
4.6.4.3 Vibration, sinusoidal (operational)
The DSD shall function correctly when submitted to vibration at levels appropriate to its normal service
environment. To confirm this, the DSD shall be assessed in accordance with 5.6.4.3.
4.6.4.4 Vibration, sinusoidal (endurance)
The DSD shall be capable of withstanding long exposure to vibration at levels appropriate to the service
environment. To confirm this, the DSD shall be assessed in accordance with 5.6.4.4.
4.6.5 Electrical stability — EMC, immunity tests (operational)
The DSD shall operate correctly when submitted to electromagnetic interference. To confirm this, the DSD
shall be assessed in accordance with 5.6.5.1.
4.6.6 Air leakage
The DSD shall function correctly such that any air leakage of the DSD does not adversely affect its sensitivity,
when monitoring a duct with negative pressure relative to the environment. To confirm this, the DSD shall be
assessed in accordance with 5.6.6.
5 Testing, assessment and sampling methods
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 EN 60068-1:2014 as
follows:
a) temperature: 15 °C to 35 °C;
b) relative humidity: 25 % to 75 %;
c) air pressure: 86 kPa 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 conventional
detectors) to allow a fault signal to be recognized.
Where a DSD has different sensitivity settings, the following shall apply for test in accordance with Table 1:
a) for the reproducibility test of 5.3.2 the highest and lowest sensitivity settings shall be used;
b) the fire sensitivity test of 5.5.1 shall be carried out at the lowest sensitivity setting;
c) for all other tests in Table 1 the sensitivity of the specimen shall be set at the highest sensitivity setting.
NOTE Difficulties to determine highest or lowest sensitivity can result in a need to test at additional settings.
5.1.3 Mounting arrangements
The specimen shall be mounted 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 most unfavourable 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 EN 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
The specimen for which the response threshold value is to be measured shall be installed in the aerosol
tunnel, described in Annex A, in its normal operating position, by its normal means of attachment.
This measurement can only be taken where the sampling apparatus of the DSD can fit inside the aerosol
tunnel. Where the sampling apparatus is too large, other arrangements with the manufacturer should be
taken.
Before commencing each measurement, the aerosol tunnel shall be purged 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 DSD type.
Unless otherwise specified by the manufacturer, the specimen shall be connected to its supply and monitoring
equipment as specified in 5.1.2, and shall be allowed to stabilize for a period of at least 15 min.
The test aerosol, as described in Annex B, shall be introduced into the tunnel such that the rate of increase of
aerosol density is as follows:
— for DSD incorporating detectors using scattered or transmitted light, in decibels per metre per minute:
∆m
0, 015 ≤ ≤ 0,1
∆t
— for DSD incorporating detectors using ionization, per minute:
∆y
0, 05 ≤≤  0, 3
∆t
NOTE These ranges are intended to allow the selection of a convenient rate, depending upon the sensitivity of the
DSD, 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 DSD type.
The tests on the DSD specimen shall be conducted at the air velocity of 1 m
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