NBN EN 50402 : 2006 AMD 1 2009
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The latest, up-to-date edition.
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
12-01-2013
Introduction
1 Scope
2 Normative references
3 Definitions
4 General requirements
4.1 Introduction
4.2 Functional safety characteristics of modules
5 Modules and elements - Characterisation and requirements
5.1 General requirements
5.2 Gas sampling
5.3 Sensor
5.4 Signal-transmission
5.5 Input of control unit
5.6 Signal processing in the control unit
5.7 Output of the control unit
6 Characterisation of safety requirement
6.1 General
6.2 Characterisation of safety function
6.3 Characterisation of safety integrity
6.4 Determination of SIL-capabilities for a safety function
6.5 Determination of hardware failure rates for a safety function
6.6 Safety performance requirements
7 Information requirements
7.1 Information delivered by the manufacturer of the gas
detection system
7.2 Information delivered by the user of the gas detection system
8 Validation
Annex A (informative) Gas detection systems as part of a
safety-related system
Annex B (normative) Transformation of the SIL-capabilities of
gas detection systems
Annex C (normative) Transformation from generic standard
requirements to modules
Annex D (normative) Management of functional safety
Annex E (informative) Determination of SIL-capability of a
safety function of the gas detection system
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