Glossary entry (derived from question below)
French term
chute
La notice doit indiquer les procédures permettant de s’assurer que la sécurité fonctionnelle est maintenue pendant l’exploitation et la maintenance du détecteur. Les principaux éléments sont:
- ajouter les différents niveaux de sil, architecture qui assure ces niveaux
- les actions préventives (interventions sur certaines cellules, nettoyages...) ou systématiques ( pile de sauvegarde, etc), la liste des pièces détachées et des accessoires.
- Le fonctionnement normal, les états de défaut prévisibles, les courbes de transfert (par type de gaz et y compris les paramètres pour l’alimentation électrique des capteurs ou en sortie de centrale pour l’alimentation de capteurs externes)
- Pour les situations particulières ou pour les principaux défauts ( dérive, fortes concentrations de gaz, chute, choc, ..), les actions à mener : procédure de diagnostics, maintenance, calibrage, changement cellule...
| 5 +2 | drop |
Rimas Balsys
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| 3 | fall |
Jean-Claude Gouin
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Nov 10, 2008 09:33: Rimas Balsys Created KOG entry
Non-PRO (2): David Goward, writeaway
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Proposed translations
drop
Canada
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Native in: French 
Works in: French to English, English to French, French, and 1 more.
fall
Reference comments
IEC 61508
Functional safety of electrical/electronic/programmable electronic safety-related systems - IEC 61508
http://www.iec.ch/zone/fsafety/pdf_safe/hld.pdf
Functional safety and IEC 61508
http://www.insidefunctionalsafety.com/index.php/component/if...
The EN 50402 for Fixed Gas Detection Systems in Relation to the Generic Standard EN/IEC 61508 (ID: 1)
* Dieter Wenker
Abstract:
The European standard EN 50402 [1] is a product family standard for all gas detection equipment; its subtitle is “Requirements on the functional safety of fixed gas detection systems”. The EN 50402 was transferred as new work item to IEC and will be published as IEC 60079 29 3 [2]. An IEC version of the standard will be available at the earliest 2010. The EN 50402 will be used also outside Europe as “state of the art” technical specification. The standard is based on the generic standard EN/IEC 61508 [3] and covers the phase 9 “realisation”.
Gas detection systems differ strongly in structure, complexity and performance. The EN 50402 divides a gas detection system into functional modules to ensure that systems with different structures are handled in a comparable manner. Requirements are specified for each type of simple or complex modules and for different ranges of safe failure fraction (SFF). For each module the SIL-capability is determined. Safety functions are specified by different combinations of modules which may result in different SIL-capabilities.
The EN 50402 includes no requirements for the installation and maintenance of gas detection systems and does not specify the physical positioning of sensors. These items are covered by metrological standards e.g. the EN/IEC 61779 series [4] (in future EN/IEC 60079 29 1 [5]) and related guides EN 50073 [6] (in future EN/IEC 60079 29 2 [7]).
The calculation of probability of failure on demand (PFD) and the conformity of the software development process are carried out according EN/IEC 61508 without further specification in EN 50402.
For the implementation of a gas detection system into an overall safety system the type testing according to EN 50402 will deliver SIL-capability, hardware failure probabilities and diagnostic test intervals for each safety function.
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