Fire detection and fire alarm systems - Part 22: Resettable line-type heat detectors

This European Standard applies to resettable line-type heat detectors consisting of a sensing element using an optical fibre, a pneumatic tube or an electrical sensor cable connected to a sensor control unit, either directly or through an interface module, intended for use in fire detection and fire alarm systems installed in and around buildings and other civil engineering works (see EN 54-1:2011).
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 resettable line-type heat detectors to this EN.
This European Standard also covers resettable line-type heat detectors intended for use in the local protection of plant and equipment.
Resettable line-type heat detectors with special characteristics and developed for specific risks are not covered by this EN.
This European Standard does not cover line-type heat detectors that are based on non-resettable, fixed temperature electrical cables (so called digital systems).

Brandmeldeanlagen - Teil 22: Rücksetzbare linienförmige Wärmemelder

Diese Europäische Norm ist anzuwenden für rücksetzbare linienförmige Wärmemelder mit einem Sensorelement basierend auf einem Lichtwellenleiter, einem pneumatischen Fühlerrohr oder einem elektrischen Sensorkabel, welches mit einer Auswerteeinheit entweder direkt oder über ein Interface-Modul verbunden ist, zur Verwendung in Brandmeldeanlagen, die innerhalb und außerhalb von Hoch- und Tiefbauten installiert sind (siehe EN 54 1:2011).
Diese Europäische Norm legt Anforderungen und Leistungskriterien sowie die entsprechenden Prüfverfahren fest und behandelt die Bewertung und Überprüfung der Leistungsbeständigkeit (AVCP) von rücksetzbaren linienförmigen Wärmemeldern.
Außerdem gilt diese Europäische Norm auch für rücksetzbare linienförmige Wärmemelder, die zur Einrichtungsüberwachung von Anlagen und Einrichtungen vorgesehen sind.
Rücksetzbare linienförmige Wärmemelder, die spezielle Eigenschaften haben und für Fälle mit besonderen Risiken entwickelt wurden, sind nicht Gegenstand dieser EN.
Diese Europäische Norm ist nicht anzuwenden für nicht-rücksetzbare linienförmige Wärmemelder basierend auf elektrischen Kabeln mit festgelegter Temperatur (so genannte „digitale“ Systeme).

Systèmes de détection et d'alarme incendie - Partie 22 : Détecteurs de chaleur de type linéaire réenclenchables

La présente Norme européenne s'applique aux détecteurs de chaleur de type linéaire réenclenchables qui comprennent un élément capteur utilisant une fibre optique, un tube pneumatique ou un câble électrique capteur raccordé à une unité de commande, de manière directe ou via un module d'interface, destiné à être utilisé dans les systèmes de détection et d'alarme incendie installés dans et autour des bâtiments et d'autres ouvrages de génie civil (voir EN 54-1:2011).
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 réenclenchables par rapport à la présente EN.
La présente Norme européenne couvre également les détecteurs de chaleur de type linéaire réenclenchables destinés à être utilisés pour la protection ponctuelle d’installations et d'équipements.
Les détecteurs de chaleur de type linéaire réenclenchables possédant des caractéristiques particulières, conçus pour des risques spéciaux, ne sont pas couverts par la présente EN.
La présente Norme européenne ne couvre pas les détecteurs de chaleur de type linéaire qui sont basés sur des câbles électriques à température fixe, non réenclenchables (appelés systèmes « numériques »).

Sistemi za odkrivanje in javljanje požara ter alarmiranje - 22. del: Linijski toplotni javljalniki z možnostjo ponastavitve

General Information

Status
Published
Publication Date
29-Mar-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Mar-2020
Due Date
10-May-2020
Completion Date
30-Mar-2020

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SLOVENSKI STANDARD
SIST EN 54-22:2015+A1:2020
01-maj-2020
Nadomešča:
SIST EN 54-22:2015

Sistemi za odkrivanje in javljanje požara ter alarmiranje - 22. del: Linijski toplotni

javljalniki z možnostjo ponastavitve

Fire detection and fire alarm systems - Part 22: Resettable line-type heat detectors

Brandmeldeanlagen - Teil 22: Rücksetzbare linienförmige Wärmemelder

Systèmes de détection et d'alarme incendie - Partie 22 : Détecteurs de chaleur de type

linéaire réenclenchables
Ta slovenski standard je istoveten z: EN 54-22:2015+A1:2020
ICS:
13.220.20 Požarna zaščita Fire protection
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
SIST EN 54-22:2015+A1:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 54-22:2015+A1:2020
---------------------- Page: 2 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 13.220.20; 13.220.10 Supersedes EN 54-22:2015
English Version
Fire detection and fire alarm systems - Part 22: Resettable
line-type heat detectors

Systèmes de détection et d'alarme incendie - Partie 22 : Brandmeldeanlagen - Teil 22: Rücksetzbare

Détecteurs de chaleur de type linéaire réenclenchables linienförmige Wärmemelder

This European Standard was approved by CEN on 19 March 2015 and includes Amendment 1 approved by CEN on 16 October

2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 54-22:2015+A1:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
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 ......................................................................................... 11

4.3 Operational reliability ................................................................................................................................ 11

4.4 Tolerance to supply voltage ..................................................................................................................... 13

4.5 Performance parameters under fire conditions ............................................................................... 14

4.6 Durability of nominal activation conditions/sensitivity ............................................................... 14

5 Testing, assessments and sampling methods .................................................................................... 16

5.1 General ............................................................................................................................................................. 16

5.2 Test procedures nominal activation conditions/sensitivity ........................................................ 20

5.3 Test procedures operational reliability............................................................................................... 21

5.4 Tolerance to supply voltage ..................................................................................................................... 22

5.5 Performance parameters under fire conditions ............................................................................... 23

5.6 Durability of nominal activation conditions/sensitivity ............................................................... 27

6 Assessment and verification of constancy of performance (AVCP) ........................................... 48

6.1 General ............................................................................................................................................................. 48

6.2 Type testing .................................................................................................................................................... 48

6.3 Factory production control (FPC) .......................................................................................................... 50

7 Classification .................................................................................................................................................. 55

8 Marking, labelling and packaging .......................................................................................................... 55

8.1 General ............................................................................................................................................................. 55

8.2 Marking of sensor control unit ................................................................................................................ 55

8.3 Marking of sensing element ..................................................................................................................... 56

8.4 Marking of functional units ...................................................................................................................... 56

Annex A (normative) Arrangement of the sensing element in the fire test room ............................... 57

A.1 General ............................................................................................................................................................. 57

A.2 Fire test room arrangement ..................................................................................................................... 57

A.3 Sensing element outside the fire test room ........................................................................................ 57

Annex B (normative) Flaming liquid test fires (TF6F, TF6 and TF6S) ..................................................... 59

B.1 General ............................................................................................................................................................. 59

B.2 Arrangement .................................................................................................................................................. 59

B.3 Ignition ............................................................................................................................................................. 59

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SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)

B.4 End of test condition .................................................................................................................................... 59

B.5 Test validity criteria .................................................................................................................................... 60

Annex C (normative) Test arrangement for the sensing element of linear heat detector in

the heat tunnel ............................................................................................................................................... 61

C.1 General ............................................................................................................................................................. 61

C.2 Test arrangement for the sensing element ......................................................................................... 61

Annex D (informative) Apparatus for mounting of the sensing element of linear heat

detector in the heat tunnel ........................................................................................................................ 62

D.1 General ............................................................................................................................................................. 62

D.2 Test apparatus ............................................................................................................................................... 62

Annex E (normative) Mounting of the sensing element of multipoint RLTHD in the heat

tunnel ................................................................................................................................................................ 63

E.1 General ............................................................................................................................................................. 63

E.2 Mounting arrangement of multipoint sensing element .................................................................. 63

Annex F (normative) Heat tunnel for response time and response temperature

measurements ............................................................................................................................................... 65

F.1 General ............................................................................................................................................................. 65

F.2 Description of the heat tunnel ................................................................................................................. 65

Annex G (informative) Construction of the heat tunnel ................................................................................. 66

G.1 General ............................................................................................................................................................. 66

G.2 Heat tunnel construction ........................................................................................................................... 66

Annex H (normative) Test arrangement for vibration tests for sensing element ............................... 68

H.1 General ............................................................................................................................................................. 68

H.2 Test setup ........................................................................................................................................................ 68

Annex I (normative) Test apparatus for impact test on the sensing element ....................................... 69

I.1 General ............................................................................................................................................................. 69

I.2 Test apparatus ............................................................................................................................................... 69

I.3 Test setup ........................................................................................................................................................ 69

Annex J (informative) Data supplied with resettable line-type heat detectors .................................... 72

Bibliography ................................................................................................................................................................. 74

---------------------- Page: 5 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
European foreword

This document (EN 54-22:2015+A1:2020) 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 2020, and conflicting national standards shall

be withdrawn at the latest by August 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes !EN 54-22:2015".
This document includes Amendment 1, approved by CEN on 2019-10-16.

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".

!deleted text"
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 detector 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 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
---------------------- Page: 6 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
Part 21: Alarm transmission and fault warning routine equipment
Part 22: Resettable 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 and system requirements
Part 26: Carbon monoxide detectors – Point detectors (in preparation)
Part 27: Duct smoke detectors (in preparation)
Part 28: Non-resettable line-type heat detectors (in preparation)

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 detector – 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 organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
---------------------- Page: 7 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
Introduction

Resettable line-type heat detectors (RLTHD) have been incorporated into fire alarm systems for a

considerable number of years. 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 RLTHD products. RLTHD are based upon

many unique operating principles. It is the intention of this standard to define common operating

characteristics for each type of RLTHD in conjunction with existing EN 54 detector standards, so that

resettable line-type heat detectors have a response behaviour comparable to that of point type heat

detectors.

Due to the various applications for RLTHD, 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 RLTHD should be used in applications. However,

the standard indicates two general fields of application, room protection and secondly local protection.

The standard defines separate response test classifications for these two fields.

Generally there are two functional principles employed by RLTHD: non-integrating and integrating

systems. Therefore separated subclasses have been created for non integrating systems and for

integrating systems.
---------------------- Page: 8 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
1 Scope

This European Standard applies to resettable line-type heat detectors consisting of a sensing element

using an optical fibre, a pneumatic tube or an electrical sensor cable connected to a sensor control unit,

either directly or through an interface module, intended for use in fire detection and fire alarm systems

installed in and around buildings and other civil engineering works (see EN 54-1:2011).

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

resettable line-type heat detectors to this EN.

This European Standard also covers resettable line-type heat detectors intended for use in the local

protection of plant and equipment.

Resettable line-type heat detectors with special characteristics and developed for specific risks are not

covered by this EN.

This European Standard does not cover line-type heat detectors that are based on non-resettable, fixed

temperature electrical cables (so called “digital” systems).
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 54-7:2000, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors using

scattered light, transmitted light or ionization

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 60068-1:1994, Environmental testing — Part 1: General and guidance (IEC 60068-1:1988 +

Corrigendum 1988 +A1:1992)

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)
---------------------- Page: 9 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)

EN 60068-2-78:2001, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state (IEC

60068-2-78:2001)
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
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.
3.1.2
integrating line-type heat detector

detectors for which the response to temperature is summed in some way, (not necessarily linearly),

along a length of the sensing element. For such detectors, the output to the sensor control unit is

therefore a function of the temperature distribution along the length of the sensing element

EXAMPLE Pneumatic systems.
3.1.3
linear line-type heat detector

detectors which respond to heat applied to any point along the length of the sensing element

3.1.4
line-type heat detector
LTHD
detector which responds to heat sensed in the vicinity of a continuous line

Note 1 to entry: A line-type heat detector may consist of a sensor control unit, a sensing element and functional

units.
3.1.5
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), etc.
3.1.6
multipoint line-type heat detector

detectors that contain multiple discrete temperature sensors, which are separated by a distance of no

more than 10 m, embedded within the sensing element (see 3.1.11)
3.1.7
non-resettable line-type heat detectors
NLTHD
LTHD which can only respond once
---------------------- Page: 10 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
3.1.8
non-integrating line-type heat detector

detectors for which the output signal is depending on local temperature effects but not on the

integration of the whole temperature distribution along the sensing element
EXAMPLE Fibre optics systems.
3.1.9
resettable line-type heat detectors
RLTHD
LTHD which is able to return to its quiescent condition after a response
3.1.10
room protection application

application in which the sensing element is installed at a distance from the potential fire hazard close to

the ceiling or roof of the area to be protected

EXAMPLE car parks (open or closed), road/rail/metro tunnels, floor/ceiling voids, elevator shafts, cold

stores, warehouses, heritage buildings, aircrafts hangars, spray shops, chemical storehouses, ammunition depots,

refineries, silos, etc.
3.1.11
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.
3.1.12
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 apply:
RLTHD resettable line-type heat detector.
4 Product characteristics
4.1 General
4.1.1 Compliance

In order to comply with this standard, resettable line-type heat detectors shall meet the provisions 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.
---------------------- Page: 11 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
4.1.2 Heat response classes
4.1.2.1 Heat response for room protection application

For room protection application the heat response of RLTHD is classified as indicated in Table 1.

NOTE Test fires TF6S, TF6 and TF6F are specified in Annex B.

Table 1 —Heat response, room protection for integrating and non-integrating RLTHD

Heat response Typical Maximu Minimum Maximum TF6S TF6 TF6F
class appli- m appli- static static
response time response time response time
cation cation response response
tempera- tempera- tempera- tempera-
non- Integra- Lower Upper Lower Upper Lower Upper
ture ture ture ture
integra- ting value value value value value value
°C °C
ting RLTHD °C °C s s s s s s
RLTHD
A1N A1I 25 50 54 65 50 400 30 210 20 130
A2N A2I 25 50 54 70 120 600 60 300 40 180
4.1.2.2 Heat response for local protection application

For local protection application the heat response of the RLTHD is classified as indicated in Table 2.

Table 2 —Heat response local protection for integrating and non-integrating RLTHD

Heat response class Typical Maximum Minimum static Maximum static
application application response response
non-integra- Integrating
temperature temperature temperature temperature
ting RLTHD RLTHD
°C °C °C °C
BN BI 40 65 69 85
CN CI 55 80 84 100
DN DI 70 95 99 115
EN EI 85 110 114 130
FN FI 100 125 129 145
GN GI 115 140 144 160
4.1.3 Environmental groups

Different environmental groups are necessary to reflect the different service environment of the

components of a line-type heat detector:
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 out of doors.
---------------------- Page: 12 ----------------------
SIST EN 54-22:2015+A1:2020
EN 54-22:2015+A1:2020 (E)
4.2 Nominal activation conditions/sensitivity
4.2.1 Individual alarm indication

Each sensor control unit shall be provided with an integral red visual indicator, by which the general

alarm condition 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 a 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 line-type heat detector 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.
4.2.3 Repeatability

The ratio of response times of the RLTHD shall be within the limits, even after a number of alarm

conditions, as specified in 5.2.3.
4.2.4 Reproducibility

The ratio of response times of several specimens of the RLTHD shall be within the limits as specified in

5.2.4.
4.3 Operational reliability
4.3.1 Connection of ancillary devices

Where the RLTHD 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 RLTHD.
Where such connections are present the detector shall be assessed
...

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