EN 50271:2010

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

This European Standard specifies minimum requirements and tests for electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen using software and/or digital technologies. Additional requirements are specified if compliance with safety integrity level 1 (SIL 1) according to EN 61508 series is required for low demand mode of operation. NOTE 1 It is recommended to apply this European Standard for apparatus used for safety applications with SIL-requirement 1 instead of EN 50402. However, the technical requirements of EN 50271 and EN 50402 are the same for SIL 1. NOTE 2 For fixed apparatus used for safety applications with SIL-requirements higher than 1 EN 50402 is applicable. This European Standard is applicable to fixed, transportable and portable apparatus intended for use in domestic premises as well as commercial and industrial applications. This European Standard does not apply to external sampling systems, or to apparatus of laboratory or scientific type, or to apparatus used only for process control purposes. This European Standard supplements the requirements of the European Standards for the detection and measurement of flammable gases and vapours (e.g. EN 60079 29 1, EN 50241 1, EN 50241 2, EN 50194 1, EN 50194 2), toxic gases (e.g. EN 45544 series, EN 50291 1, EN 50291 2) or oxygen (e.g. EN 50104). NOTE 3 These European Standards will be mentioned in this European Standard as "metrological standards". NOTE 4 The examples above show the state of the standardisation for gas detection apparatus at the time of publishing this European Standard. There may be other metrological standards for which this European Standard is also applicable. This European Standard is a product standard which is based on EN 61508 series. It covers part of the phase 9 "realisation" of the overall safety life cycle defined in EN 61508 1.

Elektrische Geräte für die Detektion und Messung von brennbaren Gasen, giftigen Gasen oder Sauerstoff - Anforderungen und Prüfungen für Warngeräte, die Software und/oder Digitaltechnik nutzen

Diese Europäische Norm legt Mindestanforderungen und Prüfungen für elektrische Geräte für die Detektion und Messung von brennbaren Gasen, toxischen Gasen oder Sauerstoff fest, die Software und/oder Digitaltechnik nutzen. Zusätzliche Anforderungen werden festgelegt, wenn eine Übereinstimmung mit dem Sicherheits-Integritätslevel 1 (SIL 1) gemäß Reihe EN 61508 für die Betriebsart mit niedriger Anforderungsrate gefordert wird. ANMERKUNG 1 Es wird empfohlen, diese Europäische Norm für Geräte zum Einsatz in sicherheitsgerichteten Anwendungen mit SIL-Anforderung 1 anstelle der EN 50402 anzuwenden. Die technischen Anforderungen der EN 50271 und der EN 50402 sind jedoch für SIL 1 gleich. ANMERKUNG 2 Für ortsfeste Geräte zum Einsatz in sicherheitsgerichteten Anwendungen mit SIL-Anforderungen größer als 1 ist die EN 50402 anwendbar. Diese Europäische Norm ist anwendbar auf ortsfeste, transportable und tragbare Geräte, die für die Verwendung in Wohnhäusern oder in gewerblichen oder industriellen Anwendungen vorgesehen sind. Diese Europäische Norm gilt nicht für externe Entnahmesysteme, oder für Labor- oder wissenschaftliche Geräte sowie für Geräte, die nur zur Prozesssteuerung eingesetzt werden. Diese Europäische Norm ergänzt die Anforderungen der Europäischen Normen für die Detektion und Messung von brennbaren Gasen und Dämpfen (z. B. EN 60079 29 1, EN 50241 1, EN 50241 2, EN 50194 1, EN 50194 2), toxischen Gasen (z. B. Reihe EN 45544, EN 50291 1, EN 50291 2) oder Sauerstoff (z. B. EN 50104). ANMERKUNG 3 Auf diese Europäischen Normen wird im Text als "messtechnische Normen" Bezug genommen. ANMERKUNG 4 Die oben genannten Beispiele stellen den Stand der Normung für Gaswarngeräte zum Zeitpunkt der Veröffentlichung dieser Europäischen Norm dar. Es können weitere messtechnische Normen bestehen, auf die diese Europäische Norm ebenfalls anwendbar ist. Diese Europäische Norm stellt eine Produktnorm auf Grundlage der Reihe EN 61508 dar. Sie deckt Teile der Phase 9 "Realisierung" des in EN 61508 1 definierten Gesamt-Sicherheitslebenszyklus ab.

Appareils électriques de détection et de mesure des gaz combustibles, des gaz toxiques ou de l'oxygène - Exigences et essais pour les appareils utilisant un logiciel et/ou des technologies numériques

La présente Norme Européenne spécifie les exigences minimales et les essais pour les appareils électriques de détection et de mesure de gaz combustibles, de gaz toxiques ou d'oxygène qui utilisent un logiciel et/ou des technologies numériques. Des exigences supplémentaires sont spécifiées si la conformité avec le niveau d’intégrité de sécurité 1 (SIL 1) conformément à la série EN 61508 est requise pour un mode de fonctionnement à faible demande. NOTE 1 Il est recommandé d’appliquer la présente Norme Européenne plutôt que la EN 50402 pour les matériels utilisés dans des applications de sécurité exigeant le niveau SIL 1. Cependant, les exigences techniques de la EN 50271 et de la EN 50402 sont identiques pour le niveau SIL1. NOTE 2 Pour le matériel fixe utilisé dans des applications de sécurité ayant des exigences de SIL supérieur à 1, la EN 50402 est applicable. Cette Norme Européenne s’applique aux appareils fixes, transportables et portables destinés à être utilisés dans des locaux à usage domestique ainsi qu’à applications commerciales et industrielles. La présente Norme Européenne ne s’applique ni aux systèmes d’échantillonnage externe, ni aux appareils de laboratoire ou à vocation scientifique, ni aux appareils utilisés uniquement à des fins de maîtrise des processus. Cette Norme Européenne complète les exigences des Normes Européennes pour la détection et la mesure des vapeurs et des gaz inflammables (par exemple la EN 60079 29 1, la EN 50241 1, la EN 50241 2, la EN 50194 1, la EN 50194 2), des gaz toxiques (par exemple la série EN 45544, la EN 50291 1, la EN 50291 2) ou de l’oxygène (par exemple la EN 50104). NOTE 3 Dans la présente Norme Européenne, ces Normes Européennes seront appelées « normes métrologiques ». NOTE 4 Les exemples susmentionnés illustrent l'état de la normalisation pour les appareils de détection de gaz au moment de la publication de la présente Norme Européenne. La présente Norme Européenne peut également s’appliquer à d’autres normes métrologiques. La présente Norme Européenne est une norme produit basée sur la série de normes EN 61508. Elle traite également en partie de la phase 9 « réalisation » du cycle de vie de sécurité globale défini dans la EN 61508 1.

Električne naprave za odkrivanje in merjenje vnetljivih plinov, strupenih plinov ali kisika - Zahteve in preskusi za naprave s programsko opremo in/ali digitalno tehnologijo

Ta evropski standard določa minimalne zahteve in preskuse za električne naprave za odkrivanje in merjenje vnetljivih plinov, strupenih plinov ali kisika, s programsko opremo in/ali digitalno tehnologijo. Dodatne zahteve so določene skladno s stopnjo 1 varnostne integritete (SIL 1, ki se v skladu s serijo EN 61508 zahteva za način delovanja pri nizkih zahtevah.

General Information

• Status: Withdrawn
• Publication Date: 03-Jun-2010
• Withdrawal Date: 31-May-2013
• ICS: 13.320 - Alarm and warning systems
• Technical Committee: CLC/TC 31 - Electrical apparatus for explosive atmospheres - General requirements
• Drafting Committee: CLC/SC 31-9 - Electrical apparatus for the detection and measurement of combustible gases to be used in industrial
• Parallel Committee: IEC/TC 31 - Electrical apparatus for potentially explosive atmospheres
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 15-Jun-2021
• Completion Date: 15-Jun-2021
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Directive: 94/9/EC - Directive 94/9/EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: SIST EN 50271:2010 - 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

Relations

• Replaces: EN 50271:2001 - 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
• Effective Date: 29-Jan-2023
• Replaced By: EN 50271:2018 - 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
• Effective Date: 26-Jun-2018

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2010
1DGRPHãþD
SIST EN 50271:2002
(OHNWULþQHQDSUDYH]DRGNULYDQMHLQPHUMHQMHYQHWOMLYLKSOLQRYVWUXSHQLKSOLQRYDOL
NLVLND=DKWHYHLQSUHVNXVL]DQDSUDYHVSURJUDPVNRRSUHPRLQDOLGLJLWDOQR
WHKQRORJLMR
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
Elektrische Geräte für die Detektion und Messung von brennbaren Gasen, giftigen
Gasen oder Sauerstoff - Anforderungen und Prüfungen für Warngeräte, die Software
und/oder Digitaltechnik nutzen
Appareils électriques de détection et de mesure des gaz combustibles, des gaz toxiques
ou de l'oxygène - Exigences et essais pour les appareils utilisant un logiciel et/ou des
technologies numériques
Ta slovenski standard je istoveten z: EN 50271:2010
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50271
NORME EUROPÉENNE
June 2010
EUROPÄISCHE NORM
ICS 13.320 Supersedes EN 50271:2001

English version
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
Appareils électriques de détection  Elektrische Geräte für die Detektion
et de mesure des gaz combustibles, und Messung von brennbaren Gasen,
des gaz toxiques ou de l'oxygène - giftigen Gasen oder Sauerstoff -
Exigences et essais pour les appareils Anforderungen und Prüfungen
utilisant un logiciel et/ou des technologies für Warngeräte, die Software
numériques und/oder Digitaltechnik nutzen

This European Standard was approved by CENELEC on 2010-06-01. 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

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50271:2010 E
Foreword
This European Standard was prepared by SC 31-9, Electrical apparatus for the detection and
measurement of combustible gases to be used in industrial and commercial potentially explosive
atmospheres, of Technical Committee CENELEC TC 31, Electrical apparatus for potentially explosive
atmospheres. It was submitted to the formal vote and approved by CENELEC as EN 50271
on 2010-06-01.
This document supersedes EN 50271:2001.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The State of the Art is included in Annex ZY “Significant changes between this European Standard
and EN 50271:2001”.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-06-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 94/9/EC. See Annex ZZ.
__________
- 3 - EN 50271:2010
Contents
Introduction . - 4 -
1 Scope . - 5 -
2 Normative references . - 5 -
3 Terms and definitions . - 7 -
4 Design principles . - 8 -
4.1 Basic requirements . - 8 -
4.2 Displays . - 10 -
4.3 Software. - 10 -
4.4 Hardware . - 19 -
4.5 Digital data transmission between components of apparatus . - 19 -
4.6 Test routines . - 20 -
4.7 Instruction manual . - 21 -
4.8 Additional requirements for compliance with SIL 1 . - 22 -
5 Test of the digital unit . - 22 -
5.1 General . - 22 -
5.2 Verification of functional concept . - 23 -
5.3 Performance test . - 23 -
Annex A (normative) Hardware-software integration test . - 25 -
A.1 Functional testing/Black-box testing . - 25 -
A.2 Equivalence class test with boundary value analysis . - 25 -
Annex ZY (informative) Significant changes between this European Standard and
EN 50271:2001 . - 27 -
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives . - 28 -

Figure
Figure 1 – Model of the software development process . - 12 -

Introduction
This European Standard specifies minimum requirements for functional safety of gas detection
apparatus using software and/or digital technologies and defines criteria for reliability and avoidance of
faults. Functional safety is that part of the overall safety which is related to the measures within the
gas detection apparatus to avoid or to handle failures in such a manner that the safety function will be
assured.
Gas detection apparatus will fail to function if dangerous failures occur. The aim of this European
Standard is to reduce the risk of dangerous equipment failures to levels appropriate to typical
applications of such apparatus.
Failure to function will also occur if such apparatus are not selected, installed or maintained in an
appropriate manner. In some applications failures of this type will dominate the functional safety
achieved. Users of gas detection apparatus will therefore need to ensure that selection, installation
and maintenance of such apparatus are carried out appropriately. Guidance for the selection,
installation, use and maintenance of gas detection apparatus are set out in EN 60079-29-2 and
EN 45544-4, respectively.
This European Standard does not include requirements for operational availability which will need to
be considered separately.
Regarding the requirements for the software development process, this European Standard specifies
a practical approach to comply with the requirements of EN 61508-3 for SIL 1 without using this
generic standard.
It is recommended to apply this European Standard for apparatus used for safety applications with
SIL-requirement 1 instead of EN 50402 because EN 50402 is designed for the assessment of more
complex gas detection systems with SIL-requirements greater than 1. However, the technical
requirements of EN 50271 and EN 50402 are the same for SIL 1.

- 5 - EN 50271:2010
1 Scope
This European Standard specifies minimum requirements and tests for electrical apparatus for the
detection and measurement of combustible gases, toxic gases or oxygen using software and/or digital
technologies. Additional requirements are specified if compliance with safety integrity level 1 (SIL 1)
according to EN 61508 series is required for low demand mode of operation.
NOTE 1 It is recommended to apply this European Standard for apparatus used for safety applications with SIL-requirement 1
instead of EN 50402. However, the technical requirements of EN 50271 and EN 50402 are the same for SIL 1.
NOTE 2 For fixed apparatus used for safety applications with SIL-requirements higher than 1 EN 50402 is applicable.
This European Standard is applicable to fixed, transportable and portable apparatus intended for use
in domestic premises as well as commercial and industrial applications.
This European Standard does not apply to external sampling systems, or to apparatus of laboratory or
scientific type, or to apparatus used only for process control purposes.
This European Standard supplements the requirements of the European Standards for the detection
and measurement of flammable gases and vapours (e.g. EN 60079-29-1, EN 50241-1, EN 50241-2,
EN 50194-1, EN 50194-2), toxic gases (e.g. EN 45544 series, EN 50291-1, EN 50291-2) or oxygen
(e.g. EN 50104).
NOTE 3 These European Standards will be mentioned in this European Standard as "metrological standards".
NOTE 4 The examples above show the state of the standardisation for gas detection apparatus at the time of publishing this
European Standard. There may be other metrological standards for which this European Standard is also applicable.
This European Standard is a product standard which is based on EN 61508 series. It covers part of
the phase 9 "realisation" of the overall safety life cycle defined in EN 61508-1.
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 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 measuring
concentrations in the region of limit values
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 measuring
concentrations well above limit values
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 50104 Electrical apparatus for the detection and measurement of oxygen –
Performance requirements and test methods

EN 50194-1 Electrical apparatus for the detection of combustible gases in domestic
premises – Part 1: Test methods and performance requirements
EN 50194-2 Electrical apparatus for the detection of combustible gases in domestic
premises – Part 2: Electrical apparatus for continuous operation in a fixed
installation in recreational vehicles and similar premises – Additional test
methods and performance requirements
EN 50241-1 Specification for open path apparatus for the detection of combustible or
toxic gases and vapours – Part 1: General requirements and test methods
EN 50241-2 Specification for open path apparatus for the detection of combustible or
toxic gases and vapours – Part 2: Performance requirements for apparatus
for the detection of combustible gases
EN 50291-1 Electrical apparatus for the detection of carbon monoxide in domestic
premises – Part 1: Test methods and performance requirements
EN 50291-2 Electrical apparatus for the detection of carbon monoxide in domestic
premises – Part 2: Electrical apparatus for continuous operation in a fixed
installation in recreational vehicles and similar premises including
recreational craft – Additional test methods and performance re
...