SIST EN 54-28:2016
(Main)Fire detection and fire alarm system - Part 28: Non-resettable line-type heat detectors
Fire detection and fire alarm system - Part 28: Non-resettable line-type heat detectors
This European Standard applies to non-resettable line-type heat detectors consisting of a sensing element using an electrical sensor cable which can be connected to a sensor control unit or either directly or through an interface module to a control and indicating equipment intended for use in fire detection and fire alarm systems installed in and around buildings and civil engineering works (see EN 54 1:2011).
The non-resettable sensing element has a fixed temperature alarm threshold and does not distinguish between short circuit and alarm condition.
This European Standard specifies the requirements and performance criteria, the corresponding test methods and provides for the Assessment and Verification of Constancy of Performance (AVCP) of non-resettable line-type heat detectors to this European Standard.
This European Standard also covers non-resettable line-type heat detectors intended for use in the local protection of plant and equipment.
Non-resettable line-type heat detectors with special characteristics and developed for specific risks are not covered by this standard.
Brandmeldeanlagen - Teil 28: Nicht-rücksetzbare linienförmige Wärmemelder
Diese Europäische Norm gilt für nicht-rücksetzbare linienförmige Wärmemelder bestehend aus einem Sensorelement, das ein elektrisches Sensorkabel nutzt, welches mit einer Auswerteeinheit oder, entweder direkt oder über ein Interface Modul, mit einer Brandmelderzentrale verbunden sein kann, die zur Verwendung in Brandmeldeanlagen vorgesehen ist, die innerhalb und außerhalb von Gebäuden und anderen Hoch- und Tiefbauten installiert sind (siehe EN 54 1:2011).
Das nicht-rücksetzbare Sensorelement hat eine feste Temperatur-Alarmschwelle und unterscheidet nicht zwischen Kurzschluss und Alarmzustand.
Diese Europäische Norm legt Anforderungen, Leistungskriterien und die entsprechenden Prüfverfahren fest und stellt die Bewertung und Überprüfung der Leistungsbeständigkeit (AVCP) von nicht-rücksetzbaren linienförmigen Wärmemeldern nach dieser Europäischen Norm zur Verfügung.
Diese Europäische Norm gilt auch für nicht-rücksetzbare linienförmige Wärmemelder, die zur Einrichtungs¬überwachung von Anlagen und Ausrüstung vorgesehen sind.
Nicht-rücksetzbare linienförmige Wärmemelder, die spezielle Eigenschaften haben und für Fälle mit besonderen Risiken entwickelt wurden, sind nicht Gegenstand dieser Norm.
Systèmes de détection et d'alarme incendie - Partie 28 : Détecteurs de chaleur de type linéaire non réenclenchables
La présente Norme européenne s'applique aux détecteurs de chaleur de type linéaire non réenclenchables qui comprennent un élément capteur utilisant un câble électrique capteur qui peut être raccordé à une unité de commande, ou de manière directe ou via un module d'interface à un équipement de contrôle et de signalisation, destinés à être utilisés dans les systèmes de détection et d'alarme incendie installés dans et autour des bâtiments et des ouvrages de génie civil (voir l'EN 54 1:2011).
L'élément capteur non réenclenchable a un seuil d'alarme à température fixe et ne fait pas la distinction entre un court-circuit et un état d'alarme.
La présente Norme européenne spécifie les exigences et les critères de performance, les méthodes d'essai correspondantes et prévoit l'évaluation et la vérification de la constance des performances (EVCP) des détecteurs de chaleur de type linéaire non réenclenchables par rapport à la présente Norme européenne.
La présente Norme européenne couvre également les détecteurs de chaleur de type linéaire non réenclenchables destinés à être utilisés pour la protection ponctuelle d’installations et d'équipements.
Les détecteurs de chaleur de type linéaire non réenclenchables possédant des caractéristiques particulières, conçus pour des risques spéciaux, ne sont pas couverts par la présente norme.
Sistemi za odkrivanje in javljanje požara ter alarmiranje - 28. del: Linijski toplotni javljalniki brez ponastavitve
Ta evropski standard se uporablja za linijske toplotne javljalnike brez ponastavitve z elementom za zaznavanje, ki uporablja električen senzorski kabel, ki ga je mogoče priključiti na senzorsko nadzorno enoto ali neposredno ali prek vmesniškega modula na nadzorno in indikatorsko opremo, namenjeno uporabi v sistemih za odkrivanje in javljanje požara ter alarmiranje, vgrajenih v zgradbah in gradbenih inženirskih objektih ter okoli njih (glej standard EN 54 1:2011).
Element za zaznavanje brez ponastavitve ima nastavljeno mejno alarmno vrednost temperature ter ne loči med kratkim stikom in alarmnim stanjem.
Ta evropski standard določa zahteve in merila učinkovitosti, ustrezne preskusne metode ter omogoča ocenjevanje in preverjanje nespremenljivosti zmogljivosti (AVCP) linijskih toplotnih javljalnikov brez ponastavitve v skladu s tem evropskim standardom.
Ta evropski standard zajema tudi linijske toplotne javljalnike brez ponastavitve, namenjene uporabi pri lokalni zaščiti obrata in opreme.
Linijski toplotni javljalniki brez ponastavitve s posebnimi značilnostmi, ki so razviti za posebna tveganja, niso zajeti v tem standardu.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2016
Sistemi za odkrivanje in javljanje požara ter alarmiranje - 28. del: Linijski toplotni
javljalniki brez ponastavitve
Fire detection and fire alarm system - Part 28: Non-resettable line-type heat detectors
Brandmeldeanlagen - Teil 28: Nicht-rücksetzbare linienförmige Wärmemelder
Systèmes de détection et d'alarme incendie - Partie 28 : Détecteurs de chaleur de type
linéaire non réenclenchables
Ta slovenski standard je istoveten z: EN 54-28:2016
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.
EN 54-28
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2016
EUROPÄISCHE NORM
ICS 13.220.20
English Version
Fire detection and fire alarm system - Part 28: Non-
resettable line-type heat detectors
Systèmes de détection et d'alarme incendie - Partie 28 : Brandmeldeanlagen - Teil 28: Nicht-rücksetzbare
Détecteurs de chaleur de type linéaire non linienförmige Wärmemelder
réenclenchables
This European Standard was approved by CEN on 13 December 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
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 54-28:2016 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 9
4 Product characteristics . 9
4.1 General . 9
4.2 Nominal activation conditions/sensitivity . 9
4.3 Operational reliability . 10
4.4 Tolerance to supply voltage . 12
4.5 Performance parameters under fire condition . 12
4.6 Durability of Performance parameters under fire condition . 12
5 Testing, assessment and sampling methods . 14
5.1 General . 14
5.2 Test procedures nominal activation conditions/sensitivity . 18
5.3 Test procedures operational reliability. 18
5.4 Tolerance to supply parameters . 20
5.5 Performance parameters under fire condition . 20
5.6 Durability of performance parameters under fire condition . 21
6 Assessment and Verification of Constancy of Performance (AVCP) . 38
6.1 General . 38
6.2 Type testing . 38
6.3 Factory Production Control (FPC) . 40
7 Classification and designation . 45
8 Marking, labelling and packaging . 45
8.1 Marking, labelling . 45
8.2 Packaging . 46
Annex A (normative) Mounting of the sensing element of NLTHD in the heat tunnel . 47
A.1 General . 47
A.2 Mounting arrangement of sensing element . 47
Annex B (normative) Heat tunnel for response temperature measurements . 49
B.1 General . 49
B.2 Description of the heat tunnel . 49
Annex C (informative) Construction of the heat tunnel . 50
C.1 General . 50
C.2 Heat tunnel construction . 50
Annex D (normative) Test arrangement for vibration tests for sensing element . 52
D.1 General . 52
D.2 Test setup . 52
Annex E (normative) Test apparatus for impact test on the sensing element . 53
E.1 General . 53
E.2 Test apparatus . 53
E.3 Test setup . 53
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the
EU Construction Products Regulation . 56
Bibliography . 66
European foreword
This document (EN 54-28:2016) 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 August 2016, and conflicting national standards shall
be withdrawn at the latest by February 2020.
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 the basic requirements of Regulation (EU) 305/2011.
For relationship with EU Regulations, see informative Annex ZA which is an integral part of this
document.
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 beam
— Part 13: Compatibility assessment of system components
— Part 14: Guidelines for planning, design, installation, commissioning, use and maintenance
— Part 15: Point detectors using a combination of detected phenomena
— 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: Carbon monoxide detectors – Point detectors
— Part 27: Duct smoke detectors
— 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
— Part 32: Guidelines for the planning, design, installation, commissioning, use and maintenance of voice
alarm systems
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
Non-resettable line-type heat detectors (NLTHD) have been used for a considerable number of years
and are incorporated into fire detection systems and in some countries even into fire alarm systems if
accepted by the relevant authorities. These detectors are typically used in areas where point type heat
detectors are presented with challenging environmental characteristics and also, where access to the
detectors, may significantly influence the fire alarm system design.
This standard defines the minimum system functionality for NLTHD products.
Due to the various applications for NLTHD, it is necessary to devise separate environmental
classification tests for the sensing element and the sensor control units of these systems. It is not the
purpose of this standard to define applications or how NLTHD should be used in applications.
Generally NLTHD operate on using the same basic principle. However, they can have different
performance with respect to the temperature response. Therefore they have been differentiated by a
type code which reflects the nominal alarm temperature, the tolerance range and the maximum
ambient temperature at which they could be used.
1 Scope
This European Standard applies to non-resettable line-type heat detectors consisting of a sensing
element using an electrical sensor cable which can be connected to a sensor control unit or either
directly or through an interface module to a control and indicating equipment intended for use in fire
detection and fire alarm systems installed in and around buildings and civil engineering works (see
EN 54-1:2011).
The non-resettable sensing element has a fixed temperature alarm threshold and does not distinguish
between short circuit and alarm condition.
This European Standard specifies the requirements and performance criteria, the corresponding test
methods and provides for the Assessment and Verification of Constancy of Performance (AVCP) of non-
resettable line-type heat detectors to this European Standard.
This European Standard also covers non-resettable line-type heat detectors intended for use in the local
protection of plant and equipment.
Non-resettable line-type heat detectors with special characteristics and developed for specific risks are
not covered by 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
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 60068-1:2013)
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 60068-2-27:2009, Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock (IEC 60068-
2-27:2009)
EN 60068-2-30:2005, Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h
cycle) (IEC 60068-2-30:2005)
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 60068-2-6:2008, Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal) (IEC 60068-
2-6:2008)
EN 60068-2-75:1997, Environmental testing - Part 2-75: Tests - Test Eh: Hammer tests (IEC 60068-2-
75:1997)
EN 60068-2-78:2013, Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state
(IEC 60068-2-78:2012)
3 Terms, definitions and abbreviations
For the purposes of this document, the terms and definitions given in EN 54-1:2011 and the following
apply.
3.1 Terms and definitions
3.1.1
digital detector
detectors, the sensing element of which can be either of two states: standby or alarm
Note 1 to entry: In this type of detector the alarm threshold is inherent to the construction of the sensing
element.
3.1.2
functional unit
part of a line-type heat detector in addition to the sensor control unit and the sensing element which is
essential for the function of the line-type heat detector
EXAMPLE Terminating device, filter, switch.
3.1.3
local protection application
application in which the sensing element is installed in relatively close proximity to the potential fire
risk
EXAMPLE Pipelines, conveyor belts, combustion engines/turbines, rolling stock, transformers, process
dryers, cable trays, escalators, chemical process equipment, electrical equipment cabinets, ventilation systems
(dust collector, hood extractor, etc.), switch gear (e.g. printing press).
3.1.4
non-resettable line-type heat detectors
NLTHD
detector which responds to heat sensed in the vicinity of a continuous line, and which can only respond
once
Note 1 to entry: A non-resettable line-type heat detector may consist of a sensor control unit, a sensing element
and functional units.
3.1.5
sensing element
heat sensing part of the line-type heat detector which can be a fibre optic cable, a pneumatic tube or an
electrical cable
Note 1 to entry: A sensing element may consist of different segments separated, e.g. by functional units or
splices.
Note 2 to entry: The sensing element may be connected directly to control and indicating equipment approved
to EN 54–2, an input/output device approved to EN 54–18 or via a dedicated sensor control unit (see 3.1.6).
3.1.6
sensor control unit
unit that supervises the sensing element and communicates to the control and indicating equipment
Note 1 to entry: The unit can be remote or an integral part of the control and indicating equipment as defined
by EN 54–2.
3.2 Abbreviations
For the purposes of this document, the following abbreviation applies.
NLTHD: non-resettable line-type heat detector
4 Product characteristics
4.1 General
4.1.1 Compliance
In order to comply with the present standard, detectors NLTHD shall comply with the requirements of
Clause 4, which shall be verified by visual inspection or engineering assessment as described in Clause 5
and shall meet the requirements of the tests.
4.1.2 NLTHD performance type
To simplify/standardize/rationalize product marking (see Clause 8), the performance type of the
NLTHD is described using the following format, Txxx-Vyy-Azzz, where:
— Txxx is the nominal alarm temperature in the range 54 °C to 160 °C;
— Vyy is the variance of the nominal alarm temperature in ± %, which is either 05 or 10;
— Azzz is the maximum ambient temperature in °C, i.e. the maximum environment temperature at
which the sensing element of the NLTHD could be installed and operated without generating an
alarm.
EXAMPLE T085-V10-A066 means a NLTHD with a nominal alarm temperature of 85 °C having a variance of
10 % (i.e. a minimum alarm temperature of 76,5 °C and a maximum alarm temperature of 93,5 °C) which can be
used for an application in which the ambient temperature is no greater than 66 °C.
The difference between the maximum ambient temperature and the minimum alarm temperature is to
be at least 4°C.
4.1.3 Environmental groups
Different environmental groups are necessary to reflect the different service environment of the
components of an NLTHD:
The sensing element is in either environmental group II or III.
The sensor control unit and the functional unit are in either environmental group I, II or III.
NOTE Environmental group I covers equipment likely to be installed indoors in commercial/industrial
premises but for which the avoidance of extreme environmental conditions can be taken into account in the
selection of the mounting site. Environmental group II covers equipment likely to be installed indoors in
commercial/industrial premises in all general areas. Environmental group III covers equipment which is intended
to be installed outdoors.
4.2 Nominal activation conditions/sensitivity
4.2.1 Individual alarm indication
Each sensor control unit shall be provided with an integral latched red visual indicator, by which the
individual sensor control unit, which released an alarm, can be identified, until the alarm condition is
reset. Where other conditions of the sensor control unit can be visually indicated, they shall be clearly
distinguishable from the alarm indication, except when the sensor control unit is switched into a service
mode. The visual indicator shall be visible from a distance of 6 m in the direct line of sight
perpendicular to the surface, in an ambient light intensity up to 500 lux.
If more than one sensing element is connected to the sensor control unit, there shall be separate alarm
indication for each sensing element.
To confirm this, the detector shall be assessed in accordance with 5.2.1.
4.2.2 Signalling
The NLTHD shall signal the alarm and fault status to the control and indicating equipment.
If more than one sensing element is connected to a sensor control unit, there shall be separate alarm
and fault signals for each sensing element.
To confirm this, the detector shall be assessed in accordance with 5.2.2.
4.3 Operational reliability
4.3.1 Maximum ambient temperature
The sensing element of the NLTHD shall be capable of withstanding long term exposure to
temperatures as specified in 5.3.1.
4.3.2 Connection of ancillary devices
Where the NLTHD provides for connections to ancillary devices (e.g. remote indicators, RS 485
interface), open or short-circuit failures of these connections shall not prevent the correct operation of
the NLTHD.
Where such connections are present the detector shall be assessed in accordance with 5.3.2.
4.3.3 Manufacturer's adjustments
It shall not be possible to change the manufacturer's settings except by special means (e.g. the use of a
key, a code or a special tool or by breaking or removing a seal).
To confirm this, the detector shall be assessed in accordance with 5.3.3.
4.3.4 Software controlled detectors
4.3.4.1 General
For NLTHD, which rely on software control in order to fulfil the requirements of this standard, the
requirements of 4.3.4.2, 4.3.4.3 and 4.3.4.4 shall be met.
4.3.4.2 Software documentation
4.3.4.2.1 The manufacturer shall submit documentation, which gives an overview of the software
design. This documentation shall provide sufficient detail for the design to be inspected for compliance
with this standard and shall include the following as a minimum:
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,
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.
4.3.4.2.2 The manufacturer shall have available detailed design documentation, which only needs to
be provided if required by the testing laboratory. 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).
4.3.4.3 Software design
In order to ensure the reliability of the NLTHD, 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.
4.3.4.4 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 NLTHD.
Site-specific data shall be held in memory which will retain data for at least two weeks without external
power to the detector, unless provision is made for the automatic renewal of such data, following loss of
power, within 1 h of power being restored.
To confirm this, the detector shall be assessed in accordance with 5.3.4.
4.3.5 Sensing element fault
The NLTHD shall signal a fault condition when the sensing element is interrupted.
To confirm this, the detector shall be assessed in accordance with 5.3.5.
4.3.6 On-site adjustment of response behaviour
The effective response behaviour of a NLTHD is dependent upon both the sensitivity settings of the
sensor control unit and the heat sensing element. Some types of NLTHD therefore may have facilities to
adjust the sensitivity of the NLTHD to suit the application.
If there is provision for on-site adjustment of the response behaviour of the detector then:
a) 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;
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 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.
To confirm this, the detector shall be assessed in accordance with 5.3.6.
4.4 Tolerance to supply voltage
4.4.1 Variation in supply parameters
The NLTHD shall function correctly within the specified range(s) of the supply parameters as specified
in 5.4.1.
4.4.2 Low voltage fault
The NLTHD shall signal a fault condition when its input power supply falls below the minimum voltage
specified by the manufacturer as specified in 5.4.2.
4.5 Performance parameters under fire condition
The response temperature of the tested NLTHD's shall be within the manufacturer's performance type
declaration as specified in 5.5.
4.6 Durability of Performance parameters under fire condition
4.6.1 Temperature resistance
4.6.1.1 Dry heat (operational) for sensor control unit
The sensor control unit of the NLTHD shall function correctly at high ambient temperatures as specified
in 5.6.1.1.
4.6.1.2 Cold (operational) for sensing element
The sensing element of the NLTHD shall function correctly at low ambient temperatures as specified in
5.6.1.2.
4.6.1.3 Cold (operational) for sensor control unit
The sensor control unit of the NLTHD shall function correctly at low ambient temperatures as specified
in 5.6.1.3.
4.6.2 Humidity resistance
4.6.2.1 Damp heat, steady-state (endurance) for sensor control unit and sensing element
The NLTHD shall be capable of withstanding long term exposure to a high level of continuous humidity
as specified in 5.6.2.1.
4.6.2.2 Damp heat, cyclic (operational) for sensing element
The sensing element of the NLTHD shall function correctly at high relative humidity (with
condensation) as specified in 5.6.2.2.
4.6.2.3 Damp heat, cyclic (operational) for sensor control unit
The sensor control unit of the NLTHD shall function correctly at high relative humidity (with
condensation) as specified in 5.6.2.3.
4.6.2.4 Damp heat, steady-state (operational) for sensor control unit
The sensor control unit of the NLTHD shall function correctly high relative humidity (without
condensation) as specified in 5.6.2.4.
4.6.2.5 Damp heat, cyclic (endurance) for sensor control unit and sensing element
The NLTHD shall be capable of withstanding the long term effect of cyclic high humidity levels (with
condensation) as specified in 5.6.2.5.
4.6.3 Shock and vibration resistance
4.6.3.1 Shock (operational) for sensor control unit
The sensor control unit of the NLTHD shall function correctly when submitted to mechanical shocks
which are likely to occur in the service environment as specified in 5.6.3.1.
4.6.3.2 Impact (operational) for sensor control unit
The sensor control unit of the NLTHD shall operate correctly when submitted to mechanical impacts as
specified in 5.6.3.2.
4.6.3.3 Impact (operational) for sensing element
The sensing element of the NLTHD shall operate correctly when submitted to mechanical impacts as
specified in 5.6.3.3.
4.6.3.4 Vibration, sinusoidal (operational) for sensor control unit
The sensor control unit of the NLTHD shall operate correctly when submitted to sinusoidal vibration as
specified in 5.6.3.4.
4.6.3.5 Vibration, sinusoidal (operational) for sensing element
The sensing element of the NLTHD shall operate correctly when submitted to sinusoidal vibration as
specified in 5.6.3.5.
4.6.3.6 Vibration, sinusoidal (endurance) for sensor control unit
The sensor control unit of the NLTHD shall be capable of withstanding the effect of sinusoidal vibration
as specified in 5.6.3.6.
4.6.3.7 Vibration, sinusoidal (endurance) for sensing element
The sensing element of the NLTHD shall be capable of withstanding the effect of sinusoidal vibration as
specified in 5.6.3.7.
4.6.4 Corrosion resistance
4.6.4.1 Sulphur dioxide (SO ) corrosion (endurance) for sensing element
The sensing element of the NLTHD shall be capable of withstanding exposure to an SO corrosive
atmosphere as specified in 5.6.4.1.
4.6.4.2 Sulphur dioxide (SO ) corrosion (endurance) for sensor control unit
The sensor control unit of the NLTHD shall be capable of withstanding exposure to an SO corrosive
atmosphere as specified in 5.6.4.2.
4.6.5 Electrical stability
The NLTHD shall operate correctly when submitted to electromagnetic interference as specified in
5.6.5.
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 specified in
EN 60068-1:2014 and as follows:
a) temperature: (15 to 35) °C;
b) relative humidity: (25 to 75) %;
c) air pressure: (86 to 106) kPa.
If variations in these parameters have a significant effect on a measurement, then such variations
should be kept to a minimum during a series of measurements carried out as part of one test on one
specimen.
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).
The details of the supply and monitoring equipment and the alarm criteria used should be given in the
test report.
5.1.3 Mounting arrangements
Unless otherwise stated, 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 specified 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
deviation limit of ± 5 % shall be applied.
5.1.5 Procedure for measurement of response temperature
This procedure is to verify the manufacturer's performance type declaration and to establish any
deviation in system response temperature following the environmental tests.
The NLTHD shall be connected to a suitable supply and monitoring equipment in accordance with 5.1.2.
The response temperature of the NLTHD shall be measured using the heat tunnel described in Annex A
and Annex B.
The orientation of the sensing element in the heat tunnel shall be chosen arbitrarily.
Before the measurement, stabilize the temperature of the air stream and the section of sensing element
to be heated to a temperature 25°C below the manufacturer's declared maximum ambient temperature,
Azzz or to 25°C, whichever is the higher. The measurement is then made by increasing the air
temperature in the tunnel, linearly with respect to time and at the rate of rise specified in the applicable
test procedure, until the supply and monitoring equipment indicates an alarm or the manufacturer's
limits have been exceeded at least by 5 K.
During the measurement, the airflow in the tunnel shall be maintained at a constant mass flow,
equivalent to (0,8 ± 0,1) m/s at 25 °C. The air temperature shall be controlled to within ± 2 K of the
nominal temperature required at any time during the test.
The response temperature, T, shall be recorded at the moment an alarm is indicated.
Care should be taken not to subject detectors to a damaging thermal shock when transferring them to
and from a stabilized or alarm temperature.
The length of sensing element, used, L , shall be 10 m, unless specified otherwise in the appropriate test.
A section of minimum 0,1 m and limited by the size of the heat tunnel (L ) of sensing element shall be
test
placed in the centre of the heat tunnel (see Annex A), perpendicular to the air flow.
The remaining section of the sensing element (L1 – Ltest) not exposed to the induced test temperature
shall remain at ambient temperature (23 ± 5) °C during the measurement unless otherwise stated in the
individual tests.
To facilitate the test procedure, it may be necessary to introduce easily detachable connections between
different sections of the sensing element. The losses introduced by these connections should be taken
into account when determining L .
NOTE The manufacturer may specify a minimum length of sensing element that needs to be connected before
and/or after the section of the sensing element being heated (L ).
test
5.1.6 Provision for tests
Two continuous samples of at least 300 m of sensing element and one continuous sample of sensing
element of the maximum length as defined by the manufacturer (all taken from different production
batches numbered from 1 to 3) shall be provided to conduct the tests in 5.1.7. If applicable, at least
three specimens of sensor control unit and/or, at least three specimens of each functional unit shall also
be provided. The exact length of sensing elements and the number of sensor control units and/or
functional units shall be agreed between the manufacturer and the testing laboratory. If more than
three sensor control units and/or functional units are provided then the test schedule (see 5.1.7.) can be
modified as appropriate.
If there are different types of sensor control units, sensing elements and/or functional units (e.g. with
different environment groups), at least three specimens/samples shall be provided for each type
The specimens/batches submitted shall be deemed representative of the manufacturer's normal
production with regard to their construction and calibration.
The mean response temperature of the three specimens, as found in the reproducibility tests, should
represent the production mean. The limits specified in the reproducibility test should also be applicable
to the manufacturer's production.
5.1.7 Test schedule
The specimens shall be tested according to the following test schedule (see Table 1).
Table 1 —Test schedule
d
Test Clause Specimen No
Specimen No of Specimen No Specimen No
sensor control of sensing of functional
a
unit element unit
b b
Maximum ambient temperature test (endurance) for sensing 5.3.1 1 to 3 1 to 3 1 to 3
element
c
Sensing element fault 5.3.5 2 1 2
c
Variation in supply parameters 5.4.1 1 1 1
c
Low voltage fault (sensor control unit with external power 5.4.2 2 1 2
supply)
Performance parameters under fire condition 5.5 1 to 3 3 samples of 1
each specimen
1 to 3
c
Dry heat (operational) for sensor control unit 5.6.1.1 1 2 1
Cold (operational) for sensing element 5.6.1.2 2 1 2
c
Cold (operational) for sensor control unit 5.6.1.3 2 2 2
Damp heat, steady-state (endurance) for sensor control unit 5.6.2.1 3 2 3
and sensing element
Damp heat, cyclic (operational) for sensing element 5.6.2.2 2 1 2
c
Damp heat, cyclic (operational) for sensor control unit 5.6.2.3 2 2 2
c
Damp heat, steady-state (operational) for sensor control unit 5.6.2.4 2 2 2
Damp heat, cyclic (endurance) for sensor control unit and 5.6.2.5 2 2 2
sensing element
c
Shock (operational) for sensor control unit 5.6.3.1 3 2 3
c
Impact (operational) for sensor control unit 5.6.3.2 3 2 3
Impact (operational) for sensing element 5.6.3.3 3 1 3
c
Vibration, sinusoidal (operational) for sensor control unit 5.6.3.4 3 2 3
Vibration, sinusoidal (operational) for sensing element 5.6.3.5 3 1 3
c
Vibration, sinusoidal (endurance) for sensor control unit 5.6.3.6 3 2 3
Vibration, sinusoidal (endurance) for sensing element 5.6.3.7 3 1 3
Sulphur dioxide (SO ) corrosion (endurance) for sensing 5.6.4.1 2 1 2
element
c
Sulphur dioxide (SO2) corrosion (endurance) for sensor control 5.6.4.2 1 2 1
unit
c, e
Electromagnetic compatibility (EMC), immunity (operational) 5.6.5 2 3 2
a
If the functional unit is an integral part of the sensing element, it shall be tested with the same methods as used for the sensing element. If the
functional unit is in a separate housing, it shall be tested with the same methods as used for the sensor control unit but with severities
appropriate to its environmental class; tests for functional units shall be combined with the other test if possible.
b
If more than one sensing element may be connected to the sensor control unit and/or there are sensing elements for different environment
groups, then the number of tests shall be agreed between the manufacturer and the testing laboratory.
c
These tests. are not required if the sensing element is connected directly to control and indicating equipment complying with EN 54–2 However,
if a functional unit is required it may be necessary to do these tests with it (see footnote a).
d
The test order remains open to allow optimization of test program to minimize test time and cost.
e
The EMC tests specified in 5.6.5 are not required for NLTHDs which do not rely on active electronic components for their operation.
5.2 Test procedures nominal activation conditions/sensitivity
5.2.1 Individual alarm indication
The visual indicator(s) shall be visually inspected from a distance of 6 m, in a line through the indicator
perpendicular to the mounting surface of the enclosure, in an ambient light intensity up to 500 lux as
specified in 4.2.1.
5.2.2 Signalling
An engineering assessment shall be carried out for the correct signalling of the alarm and fault signal(s).
The following test methods shall apply to generate the alarm or fault status:
a) Sensing element faults (see 5.3.5);
b) Low voltage (see 5.4.2);
c) Procedure for measuring response temperature (see 5.1.5).
If there is more than one sensing element the assessment shall be carried out for every sensing element.
5.3 Test procedures operational reliability
5.3.1 Maximum ambient temperature test (endurance) for sensing element
5.3.1.1 Object of the test
To demonstrate the ability of the NLTHD to withstand the maximum ambient temperature declared by
the manufacturer, Azzz (see 4.1.2), without generating an alarm condition.
5.3.1.2 Mounting of the sensing element
The three lengths of 10 m of sensing element shall be mounted in a heat chamber in a way that allows
the sensing element to be heated homogeneously. A suitable test arrangement shall be agreed between
the testing laboratory and the manufacturer and shall be supplied by the manufacturer.
5.3.1.3 Test procedure
5.3.1.3.1 Reference
The test apparatus and procedure shall be as described in EN 60068
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