oSIST prEN 54-27:2008
(Main)Fire detection and fire alarm systems - Part 27: Duct smoke detectors
Fire detection and fire alarm systems - Part 27: Duct smoke detectors
This document 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.
For the testing of other types of smoke detectors, or smoke detectors working on different principles, this document can be used only for guidance.
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 country to country and are not specified in this standard.
Brandmeldeanlagen - Teil 27: Rauchmelder zur Überwachung von Lüftungsleitungen
Dieses Dokument legt Anforderungen, Prüfverfahren und Leistungsmerkmale für automatische Brandmelder
fest, die Rauch in Lüftungsleitungen erkennen und in Gebäuden als Bestandteil einer Brandmeldeanlage für
Gebäude oder als Auslöseeinrichtung für eine automatische Brandschutzeinrichtung eingesetzt werden.
Für die Prüfung anderer Typen von Rauchmeldern oder von Rauchmeldern, die nach anderen Prinzipien
arbeiten, kann dieses Dokument lediglich als Leitfaden verwendet werden.
Rauchmelder zur Überwachung von Lüftungsleitungen mit besonderen Eigenschaften und für besondere
Gefahren sind nicht Gegenstand dieser Norm.
ANMERKUNG Einige Meldertypen enthalten radioaktive Stoffe. Die nationalen Anforderungen für den Schutz gegen
ionisierende Strahlung sind in den Mitgliedsstaaten unterschiedlich und werden deshalb in der vorliegenden Norm nicht
festgelegt.
Systèmes de détection et d'alarme incendie - Partie 27 : Détecteur de fumées dans les conduits
Le présent document spécifie les exigences, les méthodes d'essai et les critères de performance des détecteurs d’incendie, détectant la fumée dans les conduits d’air de bâtiments, et faisant partie d’un système de détection et d’alarme incendie ou comme un organe de commande d’un système de protection incendie.
Le présent document peut être utilisé comme guide pour les essais d’autres types de détecteurs de fumée, ou pour ceux fonctionnant sur des principes différents.
Les détecteurs de fumée dans les conduits, possédant des caractéristiques particulières, conçus pour des risques spéciaux, ne sont pas couverts par ce document.
NOTE Certains types de détecteurs contiennent des matières radioactives. Les exigences nationales pour la protection contre les radiations étant différentes d'un pays à l'autre, celles-ci ne sont donc pas spécifiées dans la présente norme.
Sistemi za odkrivanje in javljanje požara ter alarmiranje - 27. del: Dimni javljalnik za nadzor prezračevalnih kanalov
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 54-27:2008
01-november-2008
6LVWHPL]DRGNULYDQMHLQMDYOMDQMHSRåDUDWHUDODUPLUDQMHGHO 'LPQLMDYOMDOQLN
]DQDG]RUSUH]UDþHYDOQLKNDQDORY
Fire detection and fire alarm systems - Part 27: Duct smoke detectors
Brandmeldeanlagen - Teil 27: Rauchmelder zur Überwachung von Lüftungsleitungen
Ta slovenski standard je istoveten z: prEN 54-27
ICS:
13.220.20 3RåDUQD]DãþLWD Fire protection
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
oSIST prEN 54-27:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 54-27:2008
EUROPEAN STANDARD
DRAFT
prEN 54-27
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 13.220.20
English Version
Fire detection and fire alarm systems - Part 27: Duct smoke
detectors
Brandmeldeanlagen - Teil 27: Rauchmelder zur
Überwachung von Lüftungsleitungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 72.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 54-27:2008: E
worldwide for CEN national Members.
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prEN 54-27:2008 (E)
Contents Page
Foreword.3
Introduction .4
1 Scope .6
2 Normative references .6
3 Terms, abbreviated terms and definitions .7
4 Requirements.8
5 Test methods.11
Annex A (normative) Aerosol tunnel arrangement for response measurements .28
Annex B (normative) Test aerosol for response threshold value measurements .29
Annex C (normative) Smoke measuring instruments .30
Annex D (normative) Apparatus for dazzling test.34
Annex E (normative) Fire test room and working volume arrangements for fire tests .35
Annex F (normative) Smouldering (pyrolysis) wood fire (TF2D) .37
Annex G (normative) Flaming plastics (polyurethane) fire (TF4D) .40
Annex H (normative) Low temperature black smoke (decaline) liquid fire (TF8D) .42
Annex I (informative) Information concerning the construction of the tunnel for fire tests .44
Annex J (informative) Information concerning the construction of the measuring ionization
chamber .46
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive (89/106/EEC).48
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Foreword
This document (prEN 54-27:2008) has been prepared by Technical Committee CEN/TC 72 “Fire detection
and fire alarm systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive(s).
For relationship with EC Directive(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 detectors — 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
Part 15: Point type multi-sensor fire detectors
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: Line-type heat detectors
Part 23: Fire alarm devices — Visual alarms
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
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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 environment within air ducts of a building. Detection of
smoke will release a signal to the connected control and indicating equipment and may 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 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 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.
A stand alone system is given in Figure 1. An example for a configuration of a fire detection and fire alarm
system is given in Figure 2, see also EN 54-1.
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Key
A Fire detector(s), e.g. DSD J Fault warning routing equipment
C Fire alarm device(s) K Fault warning receiving station
D Manual call point(s) L power supply equipment
G Control for fire protection system L power supply for G
1
H Fire protection system L power supply for item H
2
Figure 1 — Example for a stand alone system configuration
Key
A Fire detector(s), e.g. DSD H Fire protection system
B Control and indicating equipment J Fault warning routing equipment
C Fire alarm device(s) K Fault warning receiving station
D Manual call point(s) L power supply equipment
E Fire alarm routing equipment L power supply for G
1
F Fire alarm receiving equipment L power supply for item H
2
G Control for fire protection system
Figure 2 — Example for a configuration of a fire detection and fire alarm system
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1 Scope
This document 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.
For the testing of other types of smoke detectors, or smoke detectors working on different principles, this
document can be used only for guidance.
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 member state to member state and are not specified in this standard.
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.
EN 54-1, Fire detection and fire alarm systems — Part 1: General and definition
EN 54-7, Fire detection and fire alarm systems — Part 7: Point-type smoke detectors using scattered light,
transmitted light or ionisation
EN 54-13, Fire detection and fire alarm system — Part 13: Compatibility assessment of system components
EN 54-20, Fire detection and fire alarm systems — Part 20: Aspirating smoke detectors
EN 50130-4, Alarm systems — Part 4: Electromagnetic compatibility — Product family standard: Immunity
requirements for components of fire, intruder and social alarm systems
EN 60068-1, Environmental testing — Part 1: General and guidance (IEC 60068-1:1988 + Corrigendum 1988
+ A1:1992)
EN 60068-2-1, Environmental testing — Part 2: Tests. Tests A: cold (IEC 60068-2-1:1990)
EN 60068-2-2, Basic environmental testing procedures — Part 2: Tests. Tests B: dry heat (IEC 60068-2-
2:1974 + IEC 60068-2-2A:1976)
EN 60068-2-6, Environmental testing — Part 2: Tests — Test Fc: Vibration (sinusoidal) (IEC 60068-2-6:1995
+ Corrigendum 1995)
EN 60068-2-27, Basic environmental testing procedures — Part 2: Tests — Test Ea and guidance: Shock
(IEC 60068-2-27:1987)
EN 60068-2-42, Environmental testing — Part 2-42: Tests — Test Kc: Sulphur dioxide test for contacts and
connections (IEC 60068-2-42:2003)
EN 60068-2-75, Environmental testing — Part 2: Tests — Test Eh: Hammer tests (IEC 60068-2-75:1997)
EN 60068-2-78, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state (IEC 60068-
2-78:2001)
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EN 60950-1, Information technology equipment — Safety — Part 1: General requirements (IEC 60950-
1:2005, modified)
EN ISO 9001:2000, Quality management systems — Requirements (ISO 9001:2000)
3 Terms, abbreviated terms and definitions
3.1 Definitions
For the purposes of this document, the terms and definitions given in EN 54-1, EN 54-13 and the following
apply.
3.1.1
duct smoke detector
fire detector that monitors the air in a duct to detect smoke
NOTE The combination with additional sensors for different fire phenomena is possible.
3.1.2
response threshold value
aerosol concentration in the proximity of the specimen at the moment that it generates a signal which
indicates the presence of smoke
NOTE The response threshold value may depend on signal processing in the detector and in the control and
indicating equipment.
3.1.3
type 1 DSD
point smoke detector approved to EN 54-7 mounted inside the duct
3.1.4
type 2 DSD
point smoke detector approved to EN 54-7 mounted inside the duct with additional electrical components
3.1.5
type 3 DSD
point smoke detector approved to EN 54-7 mounted outside the duct with additional mechanical means to
sample the smoke
3.1.6
type 4 DSD
point smoke detector approved to EN 54-7 mounted outside the duct with additional mechanical means to
sample the smoke and with additional electrical components
3.1.7
type 5 DSD
ASD approved to EN 54-20
3.1.8
type 6 DSD
other types of DSD not complying with type 1 to type 5
NOTE 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
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CIE control and indicating equipment
DSD duct smoke detector
FDAS fire detection and fire alarm system
FPS fire protection system
4 Requirements
4.1 General
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 a fire protection
system, 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.
4.2 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.
4.3 Visual 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.
4.4 Additional visual indication
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.
4.5 Alarm resetting for stand alone systems
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.
4.6 Connection of ancillary devices
Each DSD shall be provided with means of the connection for at least one remote visual alarm indicator.
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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.
4.7 Power supply
4.7.1 If the DSD is part of the FDAS, the DSD shall be supplied by a power supply complying with EN 54-4.
The DSD shall signal a fault to the CIE, if the power fails.
NOTE This power supply may be common to the control and indicating equipment.
4.7.2 If the DSD is used as an actuator for a FPS, i.e. stand-alone system, then the DSD shall signal the
fault to the FPS, if the power fails. In this case a power supply complying with EN 54-4 is not required. This
power supply shall fulfil the safety requirements as given in EN 60950-1.
4.8 Monitoring of detachable detectors
For detachable detectors, means shall be provided for a remote monitoring system (e.g. CIE or FPS) to detect
the removal of the head from the base, in order to give a fault signal.
4.9 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.
4.10 On-site adjustment of response behaviour
If there is provision for on-site adjustment of the response behaviour of the DSD then:
a) for all of the settings, at which the manufacturer claims compliance with this standard, the DSD 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;
b) 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 DSD or in the
associated data, that if these setting(s) are used, the DSD does not comply with this standard.
These adjustments may be carried out at the DSD or the control and indicating equipment.
4.11 Response to slowly developing fires
For DSD the requirements as given in EN 54-7 and EN 54-20 respectively shall be applied.
4.12 Marking
Each DSD shall be clearly marked with the following information:
a) the number of this standard (i.e. EN 54-27:xxxx);
b) the name or trademark of the manufacturer or supplier;
c) the model designation (name or number);
d) the wiring terminal designations;
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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 DSD.
A removable detector head within the DSD, if applicable, shall be at least marked with b), c) and e).
Where any marking on the device uses symbols or abbreviations not in common use then these shall be
explained in the data supplied with the device.
The marking shall be visible during installation of the DSD and shall be accessible during maintenance.
The markings shall not be placed on screws or other easily removable parts.
4.13 Data
Either the DSD 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 DSD unit, reference to the appropriate
data sheet shall be given on, or with each DSD unit. These data shall include at least:
a) the range of operating duct air velocities;
b) the range of applicable duct dimensions;
c) the operating temperature range;
d) the operating voltage range;
e) the model designation (name or number) of all suitable removable detector heads, if applicable.
4.14 Requirements for software controlled DSD
4.14.1 General
The requirements of 4.14.2, 4.14.3 and 4.14.4 shall be met for DSD which rely on software control in order to
fulfil the requirements of this document.
NOTE If DSD contains software components which have been already assessed and approved in accordance with
EN 54 standards, the test results can be taken into account.
4.14.2 Software documentation
4.14.2.1 The manufacturer shall submit documentation 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.
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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.
4.14.2.2 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.).
4.14.3 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.
4.14.4 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. Writing to areas of memory containing this program and data shall only
be possible 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 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.
5 Test 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 as follows:
a) temperature: 15 °C to 35 °C;
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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 recognised.
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 the highest and lowest sensitivity settings shall be used;
b) the fire sensitivity test of 5.17 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.
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.
NOTE 1 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, it will be necessary to agree other arrangements with the manufacturer.
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.
The specimen shall be connected to its supply and monitoring equipment as specified in 5.1.2, and shall be
allowed to stabilise it for a period of at least 15 min, unless otherwise specified by the manufacturer.
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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 2 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/s ± 0,2 m/s.
The response threshold value for types 1 to 4 DSD is the aerosol density (m or y) at the moment that the
specimen gives an alarm. 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).
For type 5 DSD the response threshold value N shall be measured in accordance with EN 54-20.
For type 6 DSD either of the above methods can be used to determine the response threshold value.
Designate the greater of the response threshold value as y or m or N ; the lesser as y or m or N .
max max max min min min
5.1.6 Provision for tests
The following shall be provided for testing compliance with this document:
a) 12 specimens;
b) data required in 4.11.
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 (see 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 in accordance with the following test schedule (see Table 1). After the
reproducibility test, the least sensitive specimen (i.e. this with the highest response threshold) for the lowest
sensitivity setting shall be numbered 12 and the others 1 to 11 arbitrarily.
If DSD contains components which have been already tested and approved in accordance with EN 54
standards, the test results can be taken into account. In Table 1 it is defined wh
...
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