Electrical equipment used for detection and concentration measurement of refrigerant gases - Performance requirements and test methods

This document will define test methods and performance requirements for all electrical equipment used for the detection of the refrigerant gases as defined in EN 378 1 as well as SF6 by means of concentration measurement.
NOTE 1   For the purposes of this standard, the term “refrigerant gases” includes refrigerant gases defined in EN 378 1 as well as SF6.
This document specifies general requirements for the construction, testing and performance of electrically operated refrigerant gas detection equipment in safety applications.
The application is intended to also consider electrical equipment in refrigeration systems according to the F-Gas Regulation.
This document is applicable to apparatuses whose primary purpose is to provide an indication, alarm and/or other output function to warn of the presence of refrigerant gases or SF6 in an industrial or commercial environment and, in some cases, to initiate automatic or manual protective actions. It is applicable to apparatuses in which the sensor automatically generates an electrical signal when gas is present.
Some of these refrigerant gases could be also classified as toxic gases or vapours intended for exposure measurement or as flammable gases.
In accordance with the classification of the gas and the tasks covered in EN 60079-29-1:2016, EN 45544-2:2015 and EN 45544-3:2015 for refrigeration application, three different types of equipment are provided (see also Table A.1).
-   Type I: Refrigerant gas detection equipment for A2, A2L, R717, A3, B3 refrigerants as per safety class in EN 378 1:2016 Annex E in accordance with explosion protection. The equipment shall follow the existing performances in EN 60079 29 1:2016 for ranges up to 20 % LEL and or 0 % – 100 % LEL.
-   Type II: Refrigerant gas detection equipment for A1, A2L, B1, B2L refrigerant gases as per safety class in EN 378 1:2016 Annex E in accordance with OEL values. The equipment shall follow the performances in EN 45544-2:2015.
-   Type III Refrigerant gas detection equipment not covered by Type I or Type II for refrigerant gases A1, A2L, B1, B2L as per safety class in EN 378 1:2016 Annex E. The equipment shall follow the performances in EN 45544-3:2015
This document does not apply to non-refrigerant applications:
-   monitoring of combustible gases in the range up to 20 % or up to 100 % of the LEL level, covered by EN 60079 29 1:2016;
-   workplace atmospheres, covered by the EN 45544 series.
This document is not applicable to equipment:
-   used for air pollution monitoring;
-   external sampling systems;
-   open path gas detection;
-   residential applications;
-   process control;
-   leakage (emission rate monitoring) detection system for SF6.
NOTE 2   SF6 equipment is typically located in large and ventilated rooms or outdoor, so that monitoring SF6 concentrations in the surrounding atmosphere does not permit a reliable detection of leakages.

Elektrische Geräte zur Detektion unud Konzentrationsmessung von Kältemittelgasen - Anforderungen an das Betriebsverhalten und Prüfverfahren

Dieses Schriftstück wird Prüfverfahren und Anforderungen an das Betriebsverhalten für alle elektrischen Geräte festlegen, die mittels Konzentrationsmessung zur Detektion von Kältemittelgasen, wie in EN 378-1 festgelegt, oder von SF6 eingesetzt werden.
ANMERKUNG 1   Für die Anwendung dieser Norm schließt der Begriff "Kältemittelgas" sowohl die in EN 378-1 definierten Kältemittelgase als auch SF6 ein.
Dieses Schriftstück legt allgemeine Anforderungen an Bauweise, Prüfung und Betriebsverhalten von elektrisch betriebenen Gasmessgeräten für Kältemittel in Sicherheitsanwendungen fest.
Die Anwendung ist vorgesehen, um ebenfalls elektrische Geräte zu behandeln, die in Kälteanlagen bezüglich der F-Gas-Verordnung eingesetzt werden.
Dieses Schriftstück ist auf Geräte anwendbar, deren primärer Zweck es ist, eine Anzeige, einen Alarm und/oder ein anderes Ausgangssignal abzugeben, um vor der Anwesenheit eines Kältemittelgases oder SF6 in industriellen oder kommerziellen Umfeldern zu warnen und in einigen Fällen automatische oder manuelle Schutzmaßnahmen auszulösen. Sie ist anwendbar auf Geräte, bei denen der Sensor automatisch ein elektrisches Signal erzeugt, wenn Gas vorhanden ist.
Einige dieser Kältemittelgase können auch als toxische Gase oder Dämpfe, vorgesehen für Expositionsmessungen, oder als brennbare Gase eingeteilt sein.
In Übereinstimmung mit der Einteilung des Gases und der Einsatzzwecke für Kälteanwendungen, die von EN 60079-29-1:2016, EN 45544 2:2015 und EN 45544-3:2015 abgedeckt werden, sind drei verschiedene Gerätetypen vorgesehen.
-   Typ I: Gasmessgeräte für Kältemittelgase für Kältemittel A2, A2L, R717, A3, B3 gemäß den Sicherheitsklassen in EN 378 1:2016 Annex E in Hinblick auf den Explosionsschutz. Die Geräte müssen dem bereits geltenden Betriebsverhalten aus EN 60079 29 1:2016 für Messbereiche bis 20 % UEG und/oder 0 % – 100 % UEG entsprechen.
-   Typ II: Gasmessgeräte für Kältemittelgase für Kältemittelgase A1, A2L, B1, B2L gemäß den Sicherheitsklassen in EN 378 1:2016 Annex E in Hinblick auf Arbeitsplatzgrenzwerte. Die Geräte müssen dem Betriebsverhalten aus EN 45544-2:2015 entsprechen.
-   Typ III: Gasmessgeräte für Kältemittelgase für Kältemittelgase A1, A2L, B1, B2L gemäß den Sicherheitsklassen in EN 378 1:2016 Annex E, die nicht durch Typ I oder Typ II abgedeckt werden. Die Geräte müssen dem Betriebsverhalten aus EN 45544-3:2015 entsprechen.
Dieses Schriftstück ist nicht anwendbar auf Anwendungen außerhalb der Kältetechnik:
-   Überwachung brennbarer Gase in den Messbereichen bis 20 % UEG oder bis 100 % UEG, die von EN 60079 29 1:2016 abgedeckt wird;
-   Arbeitsplatzatmosphären, die von der Normenreihe EN 45544 abgedeckt werden.
Dieses Schriftstück ist nicht anwendbar auf Geräte:
-   die zur Überwachung von Umweltluftverschmutzungen verwendet werden;
-   externe Entnahmesysteme;
-   Messung mit offener Messstrecke;
-   häusliche Anwendungen;
-   Prozesssteuerung;
-   Leckagedetektionssysteme (Überwachung der Emissionsrate) für SF6.
ANMERKUNG 2   Geräte zur Messung von SF6 sind üblicherweise in großen und belüfteten Räumen oder im Freien angeordnet, so dass die Überwachung von SF6-Konzentrationen in der umgebenden Atmosphäre keine zuverlässige Leckageerkennung erlaubt.

Appareils électriques utilisés pour la détection et la mesure de la concentration de gaz frigorigènes - Exigences de performance et méthodes d'essai

Le présent document définira les méthodes d’essai et les exigences de performance pour tous les appareils électriques utilisés pour la détection des gaz frigorigènes, tels que définis dans l’EN 378 1, ainsi que du SF6au moyen d’un mesurage de la concentration.
NOTE 1   Pour les besoins de la présente norme, le terme « gaz frigorigène » inclut les gaz frigorigènes définis dans l’EN 378 1 ainsi que le SF6.
Le présent document spécifie les exigences générales relatives à la construction, aux essais et aux performances des appareils électriques utilisés pour la détection des gaz frigorigènes dans des applications de sécurité.
L’application est destinée à prendre également en considération les appareils électriques utilisés dans des systèmes de réfrigération conformément au Règlement relatif aux gaz fluorés.
Le présent document s’applique aux appareillages dont le principal objectif est de fournir une indication, une alarme et/ou une autre fonction de sortie pour avertir de la présence de gaz frigorigènes ou de SF6 dans un environnement industriel ou commercial et, dans certains cas, pour déclencher automatiquement ou manuellement des mesures de protection. Il est applicable aux appareillages dans lesquels le capteur génère automatique un signal électrique en présence de gaz.
Certains de ces gaz frigorigènes peuvent également être classés en tant que gaz ou vapeurs toxiques pour le mesurage de l’exposition ou en tant que gaz inflammables.
Selon la classification du gaz et les tâches traitées dans l’EN 60079-29-1:2016, l’EN 45544 2:2015 et l’EN 45544-3:2015 pour une application de réfrigération, trois types différents d’appareils sont prévus (voir également Tableau A.1).
-   Type I: Appareils de détection des gaz frigorigènes A2, A2L, R717, A3, B3 selon la classe de sécurité de l’EN 378 1:2016, Annexe E, pour la protection contre l’explosion. Les appareils doivent respecter les performances spécifiées dans l’EN 60079 29 1:2016 pour les plages allant jusqu’à 20 % de la LIE et/ou de 0 % à 100 % de la LIE.
-   Type II: Appareils de détection des gaz frigorigènes A1, A2L, B1, B2L selon la classe de sécurité de l’EN 378 1:2016, Annexe E, pour les valeurs de LEP. Les appareils doivent respecter les performances spécifiées dans l’EN 45544-2:2015.
-   Type III: Appareils de détection des gaz frigorigènes non couverts par le Type I ou le Type II pour les gaz frigorigènes A1, A2L, B1, B2L selon la classe de sécurité de l’EN 378 1:2016, Annexe E. Les appareils doivent respecter les performances spécifiées dans l’EN 45544-3:2015.
Le présent document ne s’applique pas aux applications sans gaz frigorigènes:
-   surveillance des gaz combustibles dans la plage allant jusqu’à 20 % ou jusqu’à 100 % du niveau LIE, couverte par l’EN 60079 29 1:2016;
-   atmosphères des lieux de travail, couvertes par la série EN 45544.
Le présent document n’est pas applicable:
-   aux appareils utilisés pour surveiller la pollution atmosphérique;
-   aux systèmes d’échantillonnage externes;
-   à la détection des gaz à chemin ouvert;
-   aux applications résidentielles;
-   à la commande de processus;
-   aux systèmes de détection de fuite (surveillance du taux d'émission) de SF6.
NOTE 2   Les appareils pour SF6 sont généralement installés dans de grandes salles ventilées ou à l’extérieur de sorte que la surveillance des concentrations en SF6 dans l’atmosphère environnante ne permette pas une détection fiable des fuites.

Električna oprema za zaznavanje hladilnih plinov in merjenje njihove koncentracije - Zahteve za delovanje in preskusne metode

Ta dokument določa preskusne metode in zahteve za delovanje za vso električno opremo za zaznavanje hladilnih plinov, kot je opredeljeno v standardu EN 378-1, in tudi SF6 z merjenjem koncentracije.
OPOMBA 1: Izraz »hladilni plini«, uporabljen v tem standardu, vključuje hladilne pline, ki so določeni v standardu EN 378 1, in tudi SF6.
Ta dokument določa splošne zahteve za sestavo, preskušanje in lastnosti električne opreme za zaznavanje hladilnih plinov v varnostnih načinih uporabe. Uporaba prav tako upošteva električno opremo v hladilnih sistemih v skladu z zahtevami za plin F. Ta dokument se uporablja za naprave, katerih prvotni namen je izdati opozorilo, alarm in/ali drugo izhodno funkcijo, s katero se opozori na prisotnost hladilnih plinov ali SF6 v poslovnem ali industrijskem okolju in v nekaterih primerih tudi sproži samodejne ali ročne zaščitne ukrepe. Uporablja se za aparate, v katerih senzor ob prisotnosti plina samodejno ustvari električni signal. Nekatere hladilne pline je mogoče razvrstiti kot strupene pline ali hlape, namenjene za merjenje izpostavljenosti, ali kot vnetljive pline. V skladu z razvrstitvijo plina in nalogami, ki jih za hladilno uporabo obravnavajo standardi EN 60079-29-1:2016, EN 45544-2:2015 in EN 45544-3:2015, so podani trije različni tipi opreme (glej tudi preglednico A.1).
– Tip I: Oprema za zaznavanje hladilnih plinov za hladilna sredstva A2, A2L, R717, A3, B3, kot določa varnostni razred iz dodatka E standarda EN 378-1:2016 v skladu z zaščito pred eksplozijo. Oprema mora biti skladna z obstoječimi lastnostmi iz standarda EN 60079-29-1:2016 za razpone do 20 % LEL in/ali 0–100 % LEL.
– Tip II: Oprema za zaznavanje hladilnih plinov za hladilna sredstva A1, A2L, B1, B2L, kot določa varnostni razred iz dodatka E standarda EN 378-1:2016 v skladu z vrednostmi OEL. Oprema mora biti skladna z lastnostmi iz standarda EN 45544-2:2015.
– Tip III: Oprema za zaznavanje hladilnih plinov, ki ni zajeta s tipom I ali II za hladilne pline A1, A2L, B1, B2L, kot določa varnostni razred iz dodatka E standarda EN 378-1:2016. Oprema mora biti skladna z lastnostmi iz standarda EN 45544-3:2015.
Ta dokument se ne uporablja za nehladilno uporabo:
– nadzor gorljivih plinov v razponu do 20 % ali do 100 % ravni LEL iz standarda EN 60079-29-1:2016;
– ozračja na delovnem mestu, ki so zajeta v skupini standardov EN 45544. Ta dokument se ne uporablja za opremo:
– ki se uporablja za nadzor onesnaženja zraka,
– za zunanje sisteme vzorčenja,
– za zaznavanje plinov z odprto potjo,
– pri stanovanjskih uporabah,
– za nadzor procesov,
– sistemov za odkrivanje puščanja (spremljanje stopnje emisij) za SF6.
OPOMBA 2: Oprema za SF6 je običajno nameščena v velikih in prezračevanih prostorih ali na prostem, tako da spremljanje koncentracij SF6 v okoliških ozračjih ne dovoljuje zanesljivega odkrivanja puščanja.

General Information

Status
Published
Public Enquiry End Date
30-Apr-2019
Publication Date
09-Jan-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
30-Dec-2019
Due Date
05-Mar-2020
Completion Date
10-Jan-2020

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SLOVENSKI STANDARD
SIST EN 50676:2020
01-februar-2020

Električna oprema za zaznavanje hladilnih plinov in merjenje njihove koncentracije

- Zahteve za delovanje in preskusne metode

Electrical equipment used for detection and concentration measurement of refrigerant

gases - Performance requirements and test methods

Elektrische Geräte zur Detektion unud Konzentrationsmessung von Kältemittelgasen -

Anforderungen an das Betriebsverhalten und Prüfverfahren

Appareils électriques utilisés pour la détection et la mesure de la concentration de gaz

frigorigènes - Exigences de performance et méthodes d'essai
Ta slovenski standard je istoveten z: EN 50676:2019
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
SIST EN 50676:2020 en

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

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SIST EN 50676:2020
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SIST EN 50676:2020
EUROPEAN STANDARD EN 50676
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2019
ICS 13.320; 27.200
English Version
Electrical equipment used for detection and concentration
measurement of refrigerant gases - Performance requirements
and test methods

Appareils électriques utilisés pour la détection et la mesure Elektrische Geräte zur Detektion unud

de la concentration de gaz frigorigènes - Exigences de Konzentrationsmessung von Kältemittelgasen -

performance et méthodes d'essai Anforderungen an das Betriebsverhalten und Prüfverfahren

This European Standard was approved by CENELEC on 2019-11-04. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50676:2019 E
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SIST EN 50676:2020
EN 50676:2019 (E)
Contents Page

European foreword ............................................................................................................................................ 3

Introduction ........................................................................................................................................................ 3

1 Scope ......................................................................................................................................................... 5

2 Normative references ................................................................................................................................ 5

3 Terms and definitions ................................................................................................................................ 6

Figure 1 — Warm-up time in clean air (typical) ................................................................................................. 8

4 General requirements ................................................................................................................................ 8

4.1 Introduction .......................................................................................................................................... 8

4.2 Construction ........................................................................................................................................ 9

Table 1 — Measuring ranges, reference values and maximum thresholds ...................................................... 9

4.3 Adjustments ....................................................................................................................................... 10

4.4 Gas detection transmitter for use with separate gas detection control units .................................... 10

4.5 Separate gas detection control units for use with gas detection transmitter(s) ................................ 10

4.6 Equipment using software and/or digital technologies ...................................................................... 10

4.7 Labelling and marking ....................................................................................................................... 10

4.8 Instruction manual ............................................................................................................................. 11

5 Test methods ........................................................................................................................................... 11

5.1 Introduction ........................................................................................................................................ 11

5.2 General requirements for tests .......................................................................................................... 11

5.3 Samples and sequence of tests ........................................................................................................ 11

5.4 Normal conditions for test ................................................................................................................. 12

5.5 Tests .................................................................................................................................................. 13

Table 2 — Test gas for poison gas test ........................................................................................................... 15

Annex A (normative) Gas specific performance requirements (EN 45544-1) ................................................ 17

Table A.1 — Gas specific performance requirements ..................................................................................... 17

Annex B (normative) Performance requirements under standard test conditions.......................................... 18

Table B.1 — Performance requirements under standard test conditions ....................................................... 18

Bibliography ..................................................................................................................................................... 20

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SIST EN 50676:2020
EN 50676:2019 (E)
European foreword
This document (EN 50676:2019) has been prepared by CLC/TC 216 “Gas detectors”.
The following dates are fixed:
• latest date by which this document has (dop) 2020-11-04
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2022-11-04
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 shall not be held responsible for identifying any or all such patent rights.

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SIST EN 50676:2020
EN 50676:2019 (E)
Introduction

This document specifies test methods and performance requirements for all electrical equipment used for

gas detection in refrigerant applications as defined in EN 378-1:2016 by means of concentration

measurement.

This document is addressed to the manufacturers of such equipment and test laboratories which validate it.

The tendency to use low-GWP refrigerant gases in the refrigeration and HVAC market (F-Gas Regulation)

has intensified the considerations of safety measures for low-GWP gases as some are flammable, toxic and

can cause lack of oxygen.

This document covers all refrigerant gases and defines performance requirements for the detection

equipment, mentioned in EN 378-3:2016 as gas detectors or sensors, used in refrigerant applications. The

level of safety is expected to be the same as in the already existing performance standards for general-

purpose equipment, i.e. EN 60079-29-1 concerning refrigerant flammable gases and EN 45544 series

concerning refrigerant toxic gases in atmospheres. Refrigerant gases not mentioned by EN 378-1:2016 are

also covered by this standard following the categorization scheme of EN 378-1:2016.

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SIST EN 50676:2020
EN 50676:2019 (E)
1 Scope

This document specifies general requirements for the construction, testing and performance of electrically

operated refrigerant fixed gas detection equipment in safety applications. This document does not specify

requirements for portable locating leak detectors for refrigerant application as already covered by

EN 14624:2012.

This document is applicable to equipment whose primary purpose is to provide an indication, alarm and/or

other output function to warn of the presence of refrigerant gases in an industrial or commercial environment

and, in some cases, to initiate automatic or manual protective actions. It is applicable to equipment in which

the sensor automatically generates an electrical signal when gas is present.
This standard does not apply to gas detection equipment:
— for non-refrigerant application;
— used for air pollution monitoring;
— sampling systems, which are not integral part of the gas detection equipment;
— open path gas detection;
— residential applications;
— process control;
— for applications in mines;
— portable locating leak detectors for refrigerant application.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes

requirements 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 378-1:2016, Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1:

Basic requirements, definitions, classification and selection criteria

EN 45544-1, Workplace atmospheres - Electrical apparatus used for the direct detection and direct

concentration measurement of toxic gases and vapours - Part 1: General requirements and test methods

EN 45544-2, Workplace atmospheres - Electrical apparatus used for the direct detection and direct

concentration measurement of toxic gases and vapours - Part 2: Performance requirements for apparatus

used for exposure measurement

EN 45544-3, Workplace atmospheres - Electrical apparatus used for the direct detection and direct

concentration measurement of toxic gases and vapours - Part 3: Performance requirements for apparatus

used for general gas detection

EN 45544-4, Workplace atmospheres - Electrical apparatus used for the direct detection and direct

concentration measurement of toxic gases and vapours - Part 4: Guide for selection, installation, use and

maintenance

EN 60079-29-1:2016, Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of

detectors for flammable gases

IEC 60335-2-40, Household and similar electrical appliances - Safety - Part 2-40: Particular requirements for

electrical heat pumps, air-conditioners and dehumidifiers
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SIST EN 50676:2020
EN 50676:2019 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 60079-29-1, EN 45544 series and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Gas properties
3.1.1
refrigerant

fluid used for heat transfer in a refrigerating system, which absorbs heat at a low temperature and a low fluid

pressure and expels heat at a higher temperature and a higher pressure usually involving changes of the

state of the fluid
3.1.2
halocarbon and hydrocarbon
either:

— CFC: fully-halogenated halocarbon containing only chlorine, fluorine and carbon;

— HCFC: halocarbon containing hydrogen, chlorine, fluorine and carbon;
— HFC: halocarbon containing only hydrogen, fluorine and carbon;
— PFC: fully fluorinated halocarbon containing only fluorine and carbon;
— HC: hydrocarbon containing only hydrogen and carbon
[SOURCE: EN 378-1:2016, 3.7.14]
3.1.3
hydrocarbon
contains only hydrogen and carbon
3.1.4
global warming potential
GWP

climatic warming potential of a greenhouse gas relative to that of carbon dioxide (‘CO ’), calculated in terms

of the 100-year warming potential of one kilogram of a greenhouse gas relative to one kilogram of CO

3.1.5
poison
poison for sensors
substance which leads to temporary or permanent loss of sensor sensitivity
3.1.6
reference value

value used as the basis to specify requirements such as measuring range, resolution and alarm set point

3.1.7
measuring range

range of measured values of gas concentration over which the accuracy of the equipment lies within

specified limits
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SIST EN 50676:2020
EN 50676:2019 (E)
3.1.8
group of gases

defined by the manufacturer to be measured with one piece of equipment without modification of hardware

or software which can be represented by a reference gas also defined by the manufacturer

3.1.9
reference gas
representative gas of a group of gases

Note 1 to entry: Only the reference gas is specifically tested in correspondence with the performance requirements of

this present standard.
3.1.10
correction factor

factor defined by the manufacturer to convert the measurement values of a given gas from a group in

relation to the defined reference gas
3.1.11
acute-toxicity exposure limit
ATEL

maximum recommended refrigerant concentration determined in accordance with EN 378-1 and intended to

reduce the risks of acute toxic hazards to humans in the event of a refrigerant release

[SOURCE: EN 378-1:2016, 3.7.5, modified]
3.1.12
occupational exposure limit value
OELV

limit of the time-weighted average of the concentration of a chemical agent in the air within the breathing

zone of a worker in relation to a specified reference period

Note 1 to entry: The term “limit value” is often used as a synonym for “occupational exposure limit value”, but the term

“occupational exposure limit value” is preferred because there is more than one limit value (e.g., biological limit value and

occupational exposure limit value).

Note 2 to entry: Occupational exposure limit values (OELVs) are often set for reference periods of 8 h, but can also be

set for shorter periods or concentration excursions.
3.1.13
machinery room
space that is designed to house compressors and pressure vessels
3.2 Types of equipment and components
3.2.1
gas detection transmitter

fixed gas detection equipment that provides a conditioned electronic signal or output indication to a generally

accepted industry standard (such as 4 mA to 20 mA), intended to be utilized with separate gas detection

control units or signal processing data acquisition, central monitoring and similar systems, and which

typically processes information from various locations and sources including, but not limited to gas detection

equipment
3.2.2
alarm-only equipment

equipment having an alarm but not a display or other device to indicate the measured gas concentration

Note 1 to entry: In EN 14624 and EN 378-3, this type of electrical equipment is defined as an indicating fixed gas

detector.
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SIST EN 50676:2020
EN 50676:2019 (E)
3.3 Times
3.3.1
time of response

time interval, when the equipment is in a warmed-up condition, between the time when an instantaneous

variation in volume ratio is produced at the equipment inlet and the time when the response reaches a stated

percentage (x) of the final indication
Note 1 to entry: This document refers lo t90 as the time of response.
3.3.2
warm-up time

time interval, with the equipment in a stated atmosphere, between the time when the equipment is switched

on and the time when the indication reaches and remains within the stated tolerances

Note 1 to entry: For an example see Figure 1.
Note 2 to entry: Warm-up time is not applicable to spot-reading equipment.
Key
1 power off in clean air
2 power on in clean air
3 apparatus zero
4 specified tolerance band on zero indication
5 warm-up time
y indication
x time
Figure 1 — Warm-up time in clean air (typical)
4 General requirements
4.1 Introduction

— Type I: Refrigerant gas detection equipment for A2, A2L, A3, B3 refrigerants and ammonia (R717) as

per safety class in EN 378-1:2016, Annex E in accordance with explosion protection. The equipment

shall follow the existing performances in EN 60079-29-1 for ranges up to 20 % LFL and or 0 % – 100 %

LFL. and performance requirements in EN 378 series

Equipment shall fulfil the general requirements of EN 60079-29-1 and the thresholds specified in EN 378

series.
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SIST EN 50676:2020
EN 50676:2019 (E)

— Type II: Refrigerant gas detection equipment for A1, A2L, B1, B2L refrigerants as per safety class in

Annex E of EN 378-1:2016. Performance of the equipment shall be in accordance with general

requirements in EN 45544-1 in combination with EN 45544-2.and suitable for exposure measurements

in workplace atmospheres.

Equipment shall fulfil the general requirements of EN 45544-1 in conjunction with EN 45544-2.

— Type III: Refrigerant gas detection equipment for A1, A2L, B1, B2L refrigerants as per safety class in

Annex E of EN 378-1:2016 not covered by Type I or Type II. Performance of the equipment shall be in

accordance with general requirements in EN 45544-1 in combination with EN 45544-3 and EN 378

series.

Equipment shall fulfil the general requirements of EN 45544-1 in conjunction with EN 45544-3 and the

thresholds specified in EN 378 series.

Following extensions and deviations from these general requirements are applicable.

4.2 Construction
4.2.1 General
EN 60079-29-1 and EN 45544 series shall apply.
4.2.2 Measuring ranges and correction factor
4.2.2.1 General

The maximum measuring range for Type I and Type III equipment or the reference value for Type II

equipment for
...

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