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SLOVENSKI STANDARD
01-oktober-2018
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SIST EN 50271:2010
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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 50271:2018
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
EUROPÄISCHE NORM
June 2018
ICS 13.320 Supersedes EN 50271:2010
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 et de mesure des gaz Elektrische Geräte für die Detektion und Messung von
combustibles, des gaz toxiques ou de l'oxygène - brennbaren Gasen, giftigen Gasen oder Sauerstoff -
Exigences et essais pour les appareils utilisant un logiciel Anforderungen und Prüfungen für Warngeräte, die Software
et/ou des technologies numériques und/oder Digitaltechnik nutzen
This European Standard was approved by CENELEC on 2017-11-06. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50271:2018 E
Contents
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Design principles . 8
4.1 Basic requirements . 8
4.1.1 General . 8
4.1.2 Analogue/digital interface . 8
4.1.3 Numerical errors . 8
4.1.4 Measuring operation . 8
4.1.5 Special state indication . 8
4.2 Displays . 9
4.2.1 General . 9
4.2.2 Indication of messages . 9
4.2.3 Indication of measured values . 10
4.3 Software.10
4.3.1 General . 10
4.3.2 Re-used or commercial operating systems . 11
4.3.3 Software requirements . 11
4.3.4 Requirements for software documentation . 12
4.3.5 Requirements for the software development process . 12
4.4 Hardware .20
4.5 Digital data transmission between components of apparatus .20
4.6 Test routines .20
4.7 Instruction manual .22
4.8 Additional requirements for compliance with SIL 1 .23
5 Test of the digital unit .24
5.1 General .24
5.2 Verification of functional concept .25
5.3 Performance test .25
Annex A (normative) Hardware-software integration test .27
A.1 Functional testing/Black-box testing .27
A.2 Equivalence class test with boundary value analysis .27
Annex ZY (normative) Significant changes between this European Standard and
EN 50271:2010 .29
Annex ZZ (informative) Relationship between this European standard and the essential
requirements of Directive 2014/34/EU aimed to be covered .31
Bibliography .32
European foreword
This document (EN 50271:2018) has been prepared by CLC/SC 31-9, “Electrical apparatus for the
detection and measurement of combustible gases to be used in industrial and commercial potentially
explosive atmospheres”, of CLC/TC 31, “Electrical apparatus for potentially explosive atmospheres”,
and by CLC/TC 216 “Gas detectors”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2018-12-15
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2021-06-15
conflicting with this document have to
be withdrawn
This document supersedes EN 50271:2010.
The State of the Art is included in Annex ZY “Significant changes between this European Standard
and EN 50271:2010” which lists all changes to EN 50271:2010.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association and covers essential requirements of EU Directive
2014/34/EU.
For the relationship with EU Directive see informative Annex ZZ, which is an integral part of this
document.
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
ensured.
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.
This European standard also specifies additional optional requirements for compliance with SIL 1 in
low demand mode operation. The following apparatus or gas detection systems are not fully covered
by this standard:
– apparatus at SIL 1 when the apparatus or gas detection system contains functionality not covered
by EN 50271
– apparatus at SIL 1 high demand mode operation
– apparatus at SIL 2 and SIL 3;
For such apparatus or gas detection systems the European standard EN 50402 should be used
instead of EN 50271. EN 50402 includes all requirements of EN 50271.
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.
This European Standard is applicable to fixed, transportable and portable apparatus intended for use
in domestic premises as well as commercial and industrial applications and their software-controlled
safety related accessories.
This European Standard does not apply to external sampling systems which are not accessories, 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 60079-29-4, 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 1 These European Standards will be mentioned in this European Standard as “metrological standards”.
NOTE 2 The examples above show the state of the standardization 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 the EN 61508 series. It covers part
of the phase 10 “realisation” of the overall safety life cycle defined in EN 61508-1.
Additional requirements are specified if compliance with safety integrity level 1 (SIL 1) according to the
EN 61508 series is claimed for fixed or transportable apparatus for low demand mode of operation.
They can also be applied to portable apparatus which are able to perform an automatic executive
action.
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 3 For apparatus used for safety applications with SIL-requirements higher than 1 EN 50402 is applicable.
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 50402:2017, Electrical apparatus for the detection and measurement of combustible or toxi
...