SIST EN 50545-1:2011
(Main)Electrical apparatus for the detection and measurement of toxic and combustible gases in car parks and tunnels - Part 1: General performance requirements and test methods for the detection and measurement of carbon monoxide and nitrogen oxides
Electrical apparatus for the detection and measurement of toxic and combustible gases in car parks and tunnels - Part 1: General performance requirements and test methods for the detection and measurement of carbon monoxide and nitrogen oxides
This European Standard applies to apparatus for the detection and/or the measurement of carbon
monoxide (CO), nitrogen monoxide (NO) and nitrogen dioxide (NO2) intended to control a ventilation
system and/or to give an indication, alarm or any other signal to warn of a toxic hazard. These three
gases are generically called “target gases” for the purpose of this European Standard.
National and local regulations might not require detection of NO or NO2 and might require detection of
other gases or vapours.
This European Standard includes requirements for remote gas sensors (RGS) to be used in car parks
and tunnels and requirements for the control unit (CU) to be used in car parks.
This European Standard specifies general requirements for construction and testing and describes the
test methods that apply to fixed apparatus for the detection and/or the measurement of the
concentration of the target gases in car parks and tunnels. This European Standard may also be
applied to similar applications where the concentration of the target gases could lead to a risk to
health, for example loading areas for trucks and underground bus stations.
This European Standard also applies when an apparatus manufacturer makes any claims regarding
superior performance that exceeds these minimum requirements.
This European Standard applies to apparatus, including the sampling system if applicable.
This European Standard does not specify requirements for apparatus to be installed in hazardous areas.
This European Standard does not apply for applications already covered by the following standards:
– domestic premises, covered by EN 50291-1;
– boats, craft, caravans or mobile homes, covered by EN 50291-2;
– workplace atmospheres, covered by EN 45544 series;
– emissions of heaters, covered by EN 50379 series;
– motor vehicles emissions, covered by ISO/PAS 3930;
– monitoring of the LEL level of combustible gases, covered by EN 60079-29-1.
This European Standard does not apply for the following applications and technologies:
– confined spaces not accessible to people;
– laboratory or analytical equipment;
– apparatus used to control industrial processes;
– portable and transportable apparatus;
– open path gas detection;
– tunnel construction;
– monitoring of particulates and dust;
– monitoring of combustible gases;
– CO monitoring for fire detection.
Elektrische Geräte für die Detektion und Messung von toxischen (und brennbaren) Gasen in Tiefgaragen und Tunneln - Teil 1: Allgemeine Anforderungen an das Betriebsverhalten sowie Prüfverfahren für die Detektion und Messung von Kohlenmonoxid und Stickoxiden
Diese Europäische Norm ist anwendbar für Geräte zur Detektion und / oder Messung von Kohlenmonoxid (CO), Stickstoffmonoxid (NO) und Stickstoffdioxid (NO2), die ein Lüftungssystem steuern und/oder mittels Anzeige, Alarm oder einer anderen Form von Signal vor der Gefahr einer Vergiftung warnen. Diese drei Gase werden zum Zweck dieser Europäischen Norm grundsätzlich als Zielgase bezeichnet.
Nationale und örtliche Vorschriften können möglicherweise auf die Detektion von NO oder NO2 verzichten, dafür aber die Detektion anderer Gase oder Dämpfe verlangen.
Diese Europäische Norm enthält Anforderungen für externe Sensoren (RGS) zum Einsatz in Tiefgaragen und Tunneln sowie Anforderungen an Steuereinheiten (CU) zum Einsatz in Tiefgaragen.
Diese Europäische Norm enthält die allgemeinen Anforderungen an Bauweise, Prüfung und Betriebs-verhalten und beschreibt die Prüfverfahren für ortsfeste Geräte für die Detektion und / oder Messung der Konzentration der Zielgase in Tiefgaragen und Tunneln. Diese Europäische Norm darf in ähnlichen Einsatzbereichen angewendet werden, wo die Konzentration der Zielgase zu einem Gesundheitsrisiko führen kann zum Beispiel in LKW-Ladezonen oder Bushaltestellen in Unterführungen.
Diese Europäische Norm gilt ebenfalls, wenn ein Gerätehersteller irgendwelche Angaben zu speziellen Eigenschaften der Bauart oder zu besserem Betriebsverhalten macht, welche die Mindestanforderungen übersteigen.
Diese Europäische Norm gilt für Geräte einschließlich des Probenahmesystems, falls anwendbar.
Diese Europäische Norm enthält keine Anforderungen an Geräte, damit sie in explosionsgefährdeten Bereichen montiert werden dürfen.
Diese Europäische Norm gilt nicht für die Anwendungen, die bereits durch die folgenden Normen abgedeckt werden:
– Wohnhäuser, siehe EN 50291–1;
– Boote, Caravans und Wohnmobile, siehe EN 50291–2;
– Arbeitsplatzumgebungen, siehe EN 45544;
– Emissionen von Heizungsanlagen, siehe EN 50379;
– Emissionen von Motorfahrzeugen, siehe ISO/PAS 3930;
– Überwachung der UEG bei brennbaren Gasen, siehe EN 60079–29–1.
Diese Europäische Norm gilt nicht für die folgenden Anwendungen und Technologien:
– Enge für Personen nicht zugängliche Hohlräume;
– Laborgeräte oder Analysatoren;
– Geräte zur industriellen Prozesssteuerung;
– Tragbare und transportable Geräte;
– Geräte mit offener Messstrecke;
– die Bauphase bei Tunneln;
– Überwachung von Partikeln und Staub;
– Überwachung von brennbaren Gasen;
– CO-Überwachung zur Brandmeldung.
Appareil électrique de détection de mesure de gaz combustible et toxique dans les parcs de stationnement et les tunnels - Partie 1: Exigences de performance générales et méthodes pour la détection et la mesure du monoxyde de carbone et d’oxyde d’azote
La présente Norme européenne s’applique aux appareils de détection et/ou de mesure du monoxyde de carbone (CO), du monoxyde d’azote (NO) et du dioxyde d’azote (NO2), destinés à réguler un système de ventilation et/ou à fournir une indication, une alarme ou tout autre signal d’avertissement d’un danger de toxicité. Pour les besoins de la présente Norme européenne, ces trois gaz sont désignés de manière générique “gaz cibles”.
Les réglementations nationales et locales peuvent ne pas exiger la détection du NO ou du NO2 mais plutôt la détection d’autres gaz ou vapeurs.
La présente Norme européenne comprend des exigences relatives aux capteurs à distance (RGS) à utiliser pour les parcs de stationnement et les tunnels ainsi que des exigences applicables à l’unité de contrôle/commande (CU) à utiliser pour les parcs de stationnement.
La présente Norme européenne spécifie les exigences générales relatives à la construction et aux essais et décrit les méthodes d’essai applicables aux appareils fixes de détection et/ou de mesure de la concentration des gaz cibles dans les parcs de stationnement et les tunnels. La présente Norme européenne peut également concerner des applications similaires dans le cadre desquelles la concentration des gaz cibles est susceptible d’engendrer un risque pour la santé, par exemple dans les zones de chargement des gares routières et d’autobus souterraines.
La présente Norme européenne s’applique également dans le cas où un constructeur d’appareil formule des revendications en matière de performances ou d’aptitude à la fonction supérieures aux exigences minimales considérées.
La présente Norme européenne s’applique aux appareils, y compris le système d’échantillonnage le cas échéant.
La présente Norme européenne ne spécifie aucune exigence relative aux appareils à installer dans des zones dangereuses.
La présente Norme européenne ne concerne pas les applications déjà couvertes par les normes suivantes:
– locaux à usage domestique, couverts par l’EN 50291-1;
– véhicules de loisir et locaux similaires (caravanes, mobiles homes) incluant les embarcations de loisir, couverts par l’EN 50291-2;
– atmosphères des lieux de travail, couvertes par la série EN 45544;
– conduits d’évacuation des appareils de chauffage, couverts par la série EN 50379;
– gaz d'échappement des véhicules, couverts par l’ISO/PAS 3930;
– surveillance du niveau LIE des gaz combustibles, couverte par l’EN 60079-29-1.
La présente Norme européenne ne concerne pas les applications et technologies suivantes:
– espaces confinés non accessibles au public;
– laboratoire ou équipements d’analyse;
– appareils utilisés pour le contrôle des procédés industriels;
– appareils portables et transportables;
– détection de gaz à chemin optique;
– construction de tunnel;
– surveillance des matières particulaires et des poussières;
– surveillance des gaz combustibles;
– surveillance du CO en matière de détection incendie.
Električne naprave za odkrivanje in merjenje strupenih in gorljivih plinov na avtomobilskih parkiriščih in v predorih - 1. del: Splošne tehnične zahteve in preskusne metode za zaznavanje in merjenje ogljikovega monoksida in dušikovih oksidov
Ta mednarodni standard velja za naprave za odkrivanje in/ali merjenje ogljikovega monoksida (CO), dušikovega monoksida (NO) in dušikovega dioksida (NO2), ki se uporabljajo za nadzor prezračevalnega sistema in/ali za prikaz, alarm ali drug signal, ki opozarja na nevarnost strupov. Ti trije plini se za ta evropski standard na splošno imenujejo »ciljni plini«. Nacionalne in lokalne zahteve morda ne zahtevajo odkrivanja NO ali NO2, lahko pa zahtevajo odkrivanje drugih plinov ali hlapov.
Ta evropski standard vključuje zahteve za oddaljene plinske senzorje (RGS), ki se uporabljajo na avtomobilskih parkiriščih in v predorih, in zahteve za nadzorno enoto (CU), ki se uporablja na avtomobilskih parkiriščih.
Ta evropski standard določa splošne zahteve za gradnjo in preskušanje ter opisuje preskusne metode, ki veljajo za fiksne naprave za odkrivanje in/ali merjenje koncentracij ciljnih plinov na avtomobilskih parkiriščih in v predorih. Ta evropski standard se lahko uporabi tudi pri podobnih aplikacijah, kjer koncentracija ciljnih plinov lahko privede do tveganja zdravja, na primer na območjih za nakladanje tovornjakov in podzemnih avtobusnih postajah.
Ta evropski standard velja tudi pri izjavah proizvajalca naprave o boljši zmogljivosti, ki presega minimalne zahteve.
Ta evropski standard velja za naprave, vključno s sistemom za vzorčenje, če je primerno.
Ta evropski standard ne določa zahtev za naprave, nameščene na nevarnih območjih.
Ta evropski standard ne velja za aplikacije, ki jih že zajemajo naslednji standardi:
– gospodinjstva, ki jih zajema EN 50291-1,
– čolni, plovila, prikolice ali avtodomi, ki jih zajema EN 50291-2,
– atmosfere na delovnem mestu, ki jih zajema serija EN 45544,
– emisije grelnikov, ki jih zajema serija EN 50379,
– emisije motornih vozil, ki jih zajema ISO/PAS 3930,
– nadzor ravni vnetljivih plinov LEL, ki ga zajema EN 60079-29-1.
Ta evropski standard ne velja za naslednje aplikacije in tehnologije:
– omejeni prostori, nedostopni za ljudi,
– laboratorijska ali analitska oprema,
– naprave za nadzor industrijskih procesov,
– prenosne in premične naprave,
– odkrivanje plinov na odprtih poteh,
– gradnja predorov,
– nadzor delcev in prahu,
– nadzor vnetljivih plinov,
– nadzor CO za odkrivanje požarov.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50545-1:2011
01-december-2011
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DYWRPRELOVNLKSDUNLULãþLKLQYSUHGRULKGHO 6SORãQHWHKQLþQH]DKWHYHLQ
SUHVNXVQHPHWRGH]D]D]QDYDQMHLQPHUMHQMHRJOMLNRYHJDPRQRNVLGDLQGXãLNRYLK
RNVLGRY
Electrical apparatus for the detection and measurement of toxic and combustible gases
in car parks and tunnels - Part 1: General performance requirements and test methods
for the detection and measurement of carbon monoxide and nitrogen oxides
Elektrische Geräte für die Detektion und Messung von toxischen (und brennbaren)
Gasen in Tiefgaragen und Tunneln - Teil 1: Allgemeine Anforderungen an das
Betriebsverhalten sowie Prüfverfahren für die Detektion und Messung von
Kohlenmonoxid und Stickoxiden
Appareil électrique de détection de mesure de gaz combustible et toxique dans les parcs
de stationnement et les tunnels - Partie 1: Exigences de performance générales et
méthodes pour la détection et la mesure du monoxyde de carbone et d’oxyde d’azote
Ta slovenski standard je istoveten z: EN 50545-1:2011
ICS:
13.040.50 Emisije izpušnih plinov v Transport exhaust emissions
prometu
SIST EN 50545-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50545-1:2011
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SIST EN 50545-1:2011
EUROPEAN STANDARD
EN 50545-1
NORME EUROPÉENNE
September 2011
EUROPÄISCHE NORM
ICS 13.040.50
English version
Electrical apparatus for the detection and measurement of toxic and
combustible gases in car parks and tunnels -
Part 1: General performance requirements and test methods for the
detection and measurement of carbon monoxide and nitrogen oxides
Appareil électrique de détection de Elektrische Geräte für die Detektion und
mesure de gaz combustible et toxique Messung von toxischen (und brennbaren)
dans les parcs de stationnement et les Gasen in Tiefgaragen und Tunneln -
tunnels – Partie 1: Exigences de Teil 1: Allgemeine Anforderungen an das
performance générales et méthodes pour Betriebsverhalten sowie Prüfverfahren für
la détection et la mesure du monoxyde de die Detektion und Messung von
carbone et d’oxyde d’azote Kohlenmonoxid und Stickoxiden
This European Standard was approved by CENELEC on 2011-08-15. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50545-1:2011 E
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SIST EN 50545-1:2011
EN 50545-1:2011 – 2 –
Contents
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
3.1 Gas properties . 7
3.2 Types of apparatus and components . 8
3.3 Sensors. 8
3.4 Signals and alarms . 9
3.5 Time . 9
3.6 Other .11
4 General requirements .11
4.1 Introduction .11
4.2 Construction requirements .11
4.3 Operational requirements .14
4.4 Access level .16
4.5 Information for the user .17
5 Test requirements .18
5.1 General .18
5.2 Sequence of tests .18
5.3 Preparation of apparatus before testing .19
5.4 Test gas application .19
5.5 Normal conditions for test .20
6 Test methods .21
6.1 General .21
6.2 Unpowered storage .21
6.3 Linearity .21
6.4 Alarm set points and outputs (car parks only) .22
6.5 Repeatability .23
6.6 Temperature .23
6.7 Humidity .24
6.8 Air velocity (for diffusion apparatus only) .24
6.9 Flow rate (for aspirated apparatus only) .24
6.10 Interfering gases .24
6.11 Recovery from high gas concentrations .25
6.12 Mechanical strength .25
6.13 Warm-up time .25
6.14 Response time .25
6.15 Power supply variations .26
6.16 Long-term stability .26
6.17 Field calibration, or field verification kit .26
6.18 Calibration mask .26
6.19 Testing of multiple point selector .26
6.20 Vibration.27
6.21 Electromagnetic compatibility .27
Annex A (informative) Using NO and NO standard test gases for standard and
2
humidity testing .28
A.1 General .28
A.2 NO gas testing .28
2
A.3 Humidity testing .28
Annex B (informative) Clarification regarding “6.4 Alarm set points and outputs
(car parks only)” .29
Bibliography .31
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Figures
Figure 1 – Warm-up time in clean air (typical). 10
Figure 2 – Warm-up time in standard test gas (typical) . 10
Figure B.1 – Output of the sensor . 29
Figure B.2 – Time-weighted measured gas concentration . 29
Figure B.3 – Missing areas for TWA calculation . 30
Tables
Table 1 – Measuring range. 14
Table 2 – Alarm levels . 14
Table 3 – Maximum uncertainty and concentration of standard test gases . 20
Table 4 – Tolerance for linearity . 22
Table 5 – ppm.min calculated from Table 2 and alarms 1,2 test gas concentrations . 22
Table 6 – Tolerances for alarm 1 and alarm 2 activation . 23
Table 7 – Tolerances for zero deviation . 23
Table 8 – Interfering gases table: test results to be inserted into the blank cells. 24
Table 9 – Gas concentration for recovery test . 25
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SIST EN 50545-1:2011
EN 50545-1:2011 – 4 –
Foreword
This document (EN 50545-1:2011) has been prepared by CLC Technical Body 216 "Gas detectors".
The following dates are fixed:
• latest date by which this document has (dop) 2012-08-15
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2014-08-15
• latest date by which the national
standards conflicting with this
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
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Introduction
This European Standard does not give guidance on installation of a gas detection system.
This European Standard specifies unique ranges and alarm levels for type testing, specifying
minimum requirements. All alarm levels are variable and may be adapted to national and/or local
regulations.
Separate type testing of remote gas sensors and control units is permitted. It is common practice to
use an integrated tunnel control system that includes processing of toxic gas measurement along with
other monitoring functions. When remote gas detectors and control units are type tested separately, it
is the responsibility of the manufacturer to ensure that the assembled system complies with the
requirements of this European Standard. The maximum capacity of the assembled system should not
exceed the capacity of the system that has been type tested.
Engineering companies or installers who buy equipment from different manufacturers are responsible
for the proper integration of the system.
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SIST EN 50545-1:2011
EN 50545-1:2011 – 6 –
1 Scope
This European Standard applies to apparatus for the detection and/or the measurement of carbon
monoxide (CO), nitrogen monoxide (NO) and nitrogen dioxide (NO ) intended to control a ventilation
2
system and/or to give an indication, alarm or any other signal to warn of a toxic hazard. These three
gases are generically called “target gases” for the purpose of this European Standard.
National and local regulations might not require detection of NO or NO and might require detection of
2
other gases or vapours.
This European Standard includes requirements for remote gas sensors (RGS) to be used in car parks
and tunnels and requirements for the control unit (CU) to be used in car parks.
This European Standard specifies general requirements for construction and testing and describes the
test methods that apply to fixed apparatus for the detection and/or the measurement of the
concentration of the target gases in car parks and tunnels. This European Standard may also be
applied to similar applications where the concentration of the target gases could lead to a risk to
health, for example loading areas for trucks and underground bus stations.
This European Standard also applies when an apparatus manufacturer makes any claims regarding
superior performance that exceeds these minimum requirements.
This European Standard applies to apparatus, including the sampling system if applicable.
This European Standard does not specify requirements for apparatus to be installed in hazardous areas.
This European Standard does not apply for applications already covered by the following standards:
– domestic premises, covered by EN 50291-1;
– boats, craft, caravans or mobile homes, covered by EN 50291-2;
– workplace atmospheres, covered by EN 45544 series;
– emissions of heaters, covered by EN 50379 series;
– motor vehicles emissions, covered by ISO/PAS 3930;
– monitoring of the LEL level of combustible gases, covered by EN 60079-29-1.
This European Standard does not apply for the following applications and technologies:
– confined spaces not accessible to people;
– laboratory or analytical equipment;
– apparatus used to control industrial processes;
– portable and transportable apparatus;
– open path gas detection;
– tunnel construction;
– monitoring of particulates and dust;
– monitoring of combustible gases;
– CO monitoring for fire detection.
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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 50270, Electromagnetic compatibility – Electrical apparatus for the detection and measurement of
combustible gases, toxic gases or oxygen
EN 50271, Electrical apparatus for the detection and measurement of combustible gases, toxic gases
or oxygen – Requirements and tests for apparatus using software and/or digital technologies
EN 60073, Basic and safety principles for man-machine interface, marking and identification – Coding
principles for indicators and actuators (IEC 60073)
EN 60335-1:2002 + corr. Jul.2009 + corr. May.2010 + A1:2004 + corr. Jan.2007 + A2:2006 +
A11:2004 + A12:2006 + corr. Feb.2007 + A13:2008 + A14:2010, Household and similar electrical
appliances – Safety – Part 1: General requirements (IEC 60335-1:2001 + A1:2004 + A2:2006 +
corrigendum Aug. 2006)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1 Gas properties
3.1.1
clean air
air that is free of target gas, interfering gases or contaminating substances
3.1.2
hazardous area (potentially explosive atmosphere)
an atmosphere which could become explosive due to local and operational conditions
NOTE Operation in hazardous areas may require legislative measures for the approval, installation and
construction requirements of the apparatus.
3.1.3
ppm.min
gas concentration multiplied by the time, in minutes, of gas application
NOTE Used for testing Time-weighted Average (TWA).
3.1.4
volume ratio
V/V
ratio of one component in a mixture divided by the sum of the volumes of all the components before
they are mixed at specified temperature and pressure conditions
[ISO 7504]
NOTE 1 This is also known as concentration.
NOTE 2 Assuming ideal behaviour or gases, the volume ratio coincides with the molar ratio (mol/mol). The ppm units are
-6
equivalent to the International System units 10 vol/vol.
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EN 50545-1:2011 – 8 –
3.2 Types of apparatus and components
3.2.1
calibration mask
device that when applied to the sensor provides the continuous and renovated gas supply to the
sensor such that the gas concentration reaching the sensing element remains unchanged
3.2.2
control unit
CU
part of the apparatus that receives and processes the analogue or digital signal generated by the
sensors and also generates alarms and output functions
3.2.3
fixed apparatus
apparatus that is intended to have all parts permanently installed
3.2.4
power supply
device that, by means of mains electricity or one or more rechargeable batteries, provides the suitable
power to the system or part of it
3.2.5
remote gas sensor
RGS
sensor that is not integral to the control unit of the apparatus
3.2.6
sample line
tubing and connection components by means of which the gas being sampled is conveyed to the
sensor
3.2.7
special tool
tool required to gain access to, or to adjust controls
NOTE The design of the tool is intended to discourage unauthorized interference with the apparatus.
3.3 Sensors
3.3.1
aspirated sensor
sensor that accesses the gas by drawing it to the sensing element with a pump or by other means. If
the device samples more than one point, it cycles through all related points
3.3.2
diffusion sensor
sensor that accesses the gas by convection and diffusion from the atmosphere to the sensing
element, i.e. under conditions in which there is no aspirated flow
3.3.3
sensing element
device with an electric output signal that changes when it interacts with the target gas
3.3.4
sensor
assembly in which the sensing element is housed and that may also contain associated circuit
components
NOTE The sensor may be integral with either the CU or remote (RGS).
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3.4 Signals and alarms
3.4.1
activation levels
sensor signal levels that trigger outputs and/or an alarm indications
3.4.2
alarm indication
audible or visible indication activated when a pre-set concentration level is reached
3.4.3
alarm set point
adjustable setting of the apparatus that sets the level of concentration over a period of time at which
the apparatus will automatically initiate an alarm indication and/or output
3.4.4
fault
dysfunction of a part of the system that does not disable the rest of the measure and control functions
3.4.5
fault signal
audible, visible or other type of output different from the alarm signal, signalling, directly or indirectly, a
warning or indication that the apparatus is not working satisfactorily
3.4.6
indicators
means to provide visible and/or audible information
3.4.7
latching alarm
alarm that, once activated, requires deliberate action for deactivation
3.4.8
system fault
dysfunction of the system that disables the control function
3.4.9
output
physical interface that drives external actuators
EXAMPLES Air extractors, remote warning and alarm devices.
3.4.10
quiescent condition
normal operative condition where no alarm or fault or other abnormal condition occurs
3.5 Time
3.5.1
final indication
sensor signal indication given by the apparatus after stabilization
3.5.2
stabilized apparatus
state when three successive readings of an apparatus, taken at five-minute intervals, indicate no
changes greater than ± 1 % of the measuring range
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3.5.3
time of response
t
x
time interval, with the apparatus in a warmed-up condition, between the time when an instantaneous
variation in volume ratio is produced at the apparatus inlet and the time when the response reaches a
stated percentage (x) of the final indication
NOTE This European Standard refers to t as the time of response.
90
3.5.4
warm up time
time interval, with the apparatus in a stated atmosphere, between the time when the apparatus is
switched on and the time when the indication reaches and remains within the stated tolerances
NOTE See Figures 1 and 2.
Key
1 indication
2 power off in clean air
3 power on in clean air
4 apparatus zero
5 specified tolerance band on zero indication
6 time
7 warm-up time
Figure 1 – Warm-up time in clean air (typical)
Key
1 indication
2 power off in standard test gas
3 power on in standard test gas
4 volume ratio of standard test gas
5 specified tolerances of the indication
6 time
7 zero in clean air
8 warm-up time
Figure 2 – Warm-up time in standard test gas (typical)
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3.6 Other
3.6.1
systematic error of deviation
difference between the arithmetic average value of n consecutive measurements of a reference gas,
carried out at reference conditions, and the accepted reference value
3.6.2
zone
geographical subdivision of the surveyed premises in which one or more sample points or RGS are
installed and for which a common output and/or indication is provided
4 General requirements
4.1 Introduction
4.1.1 Purpose
The apparatus shall detect the presence of target gases in fixed installations under the stated application
conditions. The sensor shall produce an analogue or digital signal (related to the concentration of the
target gases) that is processed in the CU and produces an output signal and/or an alarm indication as
defined in 4.3. Its function is to prevent and warn about the potential toxic gas risks.
4.1.2 Functionality
Apparatus for the detection and measurement of target gases in car parks and tunnels shall include
the following functionalities:
– sensors (RGS or internal in the apparatus);
– control unit / control indicating equipment (CU);
– power supply;
– indicators (visible and audible);
– output functions.
NOTE Functionalities may be in a single housing or distributed in multiple housings, and may be combined with other
functional modules. Type testing may be carried out for a complete apparatus or separately for RGS and/or CU.
4.1.3 Software-controlled apparatus
Software-controlled apparatus shall conform to EN 50271.
4.2 Construction requirements
4.2.1 General
The apparatus or parts thereof (e.g. RGS) specifically intended for use in the presence of corrosive
vapours or gases, or which might produce corrosive products as a result of the detection process shall
be constructed of materials known to be resistant to corrosion by such substances.
The apparatus shall be constructed to facilitate regular operation and performance checks.
All adjustment devices shall be designed so as to discourage unauthorized or inadvertent interference
with the apparatus.
The RGS shall be constructed to provide the degree of protection, as defined in EN 60529, in all
orientations of installation specified by the manufacturer as defined in 4.5.2. The degree of protection
shall be at least IP54.
Aspirated apparatus and control units, when separated from the RGS, shall be constructed to provide
a degree of protection of at least IP20.
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SIST EN 50545-1:2011
EN 50545-1:2011 – 12 –
4.2.2 Interface requirements
4.2.2.1 Interface requirements for separately tested RGS
A specification shall be supplied with the RGS that describes the relationship between the gas
concentration and the corresponding output signal (transfer function). The specification shall be
detailed to the extent that the accuracy of the transfer function can be verified. As a minimum, data
shall be provided showing the relationship between the output signal and the gas concentrations
corresponding to 0 %, 10 %, 25 %, 50 %, 75 % and 100 % of full-scale indication. Over-range and
status signals (e.g. fault or inhibit) shall also be specified.
Where necessary, equipment shall be provided to interpret the output signal or indication, which will
enable the accuracy of the transfer function to be verified.
4.2.2.2 Interface requirements for separately tested CU
A specification shall be supplied with the apparatus that describes the relationship between the input
signal and the calculated gas concentration (transfer function). The specification shall be detailed to
the extent that the accuracy of the transfer function can be verified. As a minimum, data shall be
provided showing the relationship between the input signal and the gas concentrations corresponding
to 0 %, 10 %, 25 %, 50 %, 75 % and 100 % of full-scale output indication. Required inputs for over-
range indications and status signals (e.g. fault or inhibit) shall also be specified.
Where necessary, equipment shall be provided to generate any required input signal, which will
enable the accuracy of the transfer function to be verified.
4.2.3 Measuring range and alarm levels
The apparatus shall measure the target gas volumetric concentrations with alarm levels and
measuring range as specified in 4.3.2.2.
For car parks, the apparatus shall identify at least three threshold conditions.
4.2.4 Indicating devices on the CU
4.2.4.1 General
The apparatus shall be equipped with the devices listed below, in order to give operating and
maintenance personnel the necessary information about the functioning conditions and the installation
it controls. These indications shall be visible and/or audible without manipulation at any access level
(as defined in 4.4).
NOTE Remote indicating devices are not covered by this European Standard; they are specified by local regulations.
4.2.4.2 Audible indications
The audible indications of the CU shall be the following:
– alarm indication (at least for alarm 3);
– fault indicat
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