SIST EN 50402:2005/A1:2008
Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of fixed gas detection systems
Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of fixed gas detection systems
Elektrische Geräte für die Detektion und Messung von brennbaren oder toxischen Gasen und Dämpfen oder Sauerstoff - Anforderungen an die funktionale Sicherheit von ortsfesten Gaswarnsystemen
Matériel électrique pour la détection et la mesure des gaz ou vapeurs combustibles ou toxiques, ou de l'oxygène - Exigences relatives à la fonction de sécurité des systèmes fixes de détection de gaz
Električne naprave za zaznavanje in merjenje vnetljivih ali strupenih plinov, hlapov ali kisika - Zahteve za funkcionalno varnost vgrajenih sistemov za odkrivanje plina
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50402:2005/A1:2008
01-september-2008
(OHNWULþQHQDSUDYH]D]D]QDYDQMHLQPHUMHQMHYQHWOMLYLKDOLVWUXSHQLKSOLQRYKODSRY
DOLNLVLND=DKWHYH]DIXQNFLRQDOQRYDUQRVWYJUDMHQLKVLVWHPRY]DRGNULYDQMHSOLQD
Electrical apparatus for the detection and measurement of combustible or toxic gases or
vapours or of oxygen - Requirements on the functional safety of fixed gas detection
systems
Elektrische Geräte für die Detektion und Messung von brennbaren oder toxischen Gasen
und Dämpfen oder Sauerstoff - Anforderungen an die funktionale Sicherheit von
ortsfesten Gaswarnsystemen
Matériel électrique pour la détection et la mesure des gaz ou vapeurs combustibles ou
toxiques, ou de l'oxygène - Exigences relatives à la fonction de sécurité des systèmes
fixes de détection de gaz
Ta slovenski standard je istoveten z: EN 50402:2005/A1:2008
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 50402:2005/A1:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50402:2005/A1:2008
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SIST EN 50402:2005/A1:2008
EUROPEAN STANDARD
EN 50402/A1
NORME EUROPÉENNE
May 2008
EUROPÄISCHE NORM
ICS 13.320
English version
Electrical apparatus for the detection and measurement
of combustible or toxic gases or vapours or of oxygen -
Requirements on the functional safety
of fixed gas detection systems
Matériel électrique pour la détection Elektrische Geräte für die Detektion
et la mesure des gaz ou vapeurs und Messung von brennbaren
combustibles ou toxiques, oder toxischen Gasen und Dämpfen
ou de l'oxygène - oder Sauerstoff -
Exigences relatives à la fonction Anforderungen an die funktionale
de sécurité des systèmes fixes Sicherheit von ortsfesten
de détection de gaz Gaswarnsystemen
This amendment A1 modifies the European Standard EN 50402:2005; it was approved by CENELEC on
2008-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment 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 amendment 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, 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
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50402:2005/A1:2008 E
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SIST EN 50402:2005/A1:2008
EN 50402:2005/A1:2008 - 2 -
Foreword
This amendment 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 explosive atmospheres.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC
as amendment A1 to EN 50402:2005 on 2008-03-01.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-03-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2011-03-01
__________
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SIST EN 50402:2005/A1:2008
- 3 - EN 50402:2005/A1:2008
5 Modules and elements – Characterisation and requirements
5.1 General requirements
Add a new paragraph at the end of 5.1:
A fault indication shall be released if a deviation in the signals of redundant units is detected. This
indication shall be connected to an output function to the periphery, e.g. relay contact (see 5.7.2).
5.4.1 Signal transmission between modules
Replace 5.4.1 by:
5.4.1 Signal transmission between modules
Characterisation: simple or complex module
The signal-transmission includes the physical connection between the modules:
− sensor and sensor interface;
− measuring point selection as well as automatic calibration and the affiliated modules for
control;
− separate control units (system communication);
− periphery and module input from periphery;
− module output to periphery and periphery.
Several signal-transmissions, independent from each other, may occur within the gas detection system.
The signal-transmissions may be realised differently.
Examples include:
− conventional wiring;
− bus connections (including loops);
− radio link;
− optical transmission.
All digital data transmissions are presumed to be complex.
Requirements for simple modules with safe failure fraction 60 % – 90 %:
All SIL-capabilities: The general requirements of 5.4 apply. A monitoring of data transmission shall be
provided to detect failure.
SIL-capability 1: There are no additional requirements.
: If the data transmission is used for a single channel the requirements of SIL-capability 1
SIL-capability 2
are sufficient. If the data transmission is used for more than one channel, e.g. bus connection or multiplex
transmission, the correct assignment of the channels shall be monitored.
SIL-capability 3: The construction shall be redundant and a comparison of output signals shall be
provided.
SIL-capability 4: Shall have a minimum hardware fault tolerance of 2 only.
Requirements for simple modules with safe failure fraction 90 % – 99 %:
To achieve a SIL-capability 1 or 2 the safe failure fraction of 60 % – 90 % is sufficient.
SIL-capability 3: A monitoring of data transmission shall be provided to detect failure. If the data
transmission is used for more than one channel, e.g. bus connection or multiplex transmission, an
automatic self-testing facility including feed in of an individual test signal for each channel shall be carried
out cyclically. The cycle time shall not exceed 24 h.
SIL-capability 4: Additionally to SIL-capability 3 the construction shall be redundant and a comparison of
output signals shall be provided.
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SIST EN 50402:2005/A1:2008
EN 50402:2005/A1:2008 - 4 -
Requirements for complex modules with safe failure fraction 60 % – 90 %:
All SIL-capabilities: The general requirements of 5.4 apply. A monitoring of data transmission shall be
provided to detect failure.
SIL-capability 1: If the data transmission is used for more than one channel, e.g. bus connection or
multiplex transmission, the correct assignment of the channels shall be monitored.
SIL-capability 2: Additionally to SIL-capability 1 the construction shall be redundant and a comparison of
output signals shall be provided.
SIL-capability 3: Additionally to SIL-capability 1 the construction shall have a minimum hardware fault
tolerance of 2 and a comparison of output signals shall be provided.
SIL-capability 4: Is not achievable.
Requirements for complex modules with safe failure fraction 90 % – 99 %:
To achieve a SIL-capability 1 the safe failure fraction of 60 % – 90 % is sufficient.
All SIL-capabilities: The general requirements of 5.4 apply.
SIL-capability 2: Measures to detect data transmission failures shall be included. The measures for
ensuring the reliable data transmission shall take into account transmission errors, repetitions, deletion,
insertion, resequencing, corruption, d
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