IEC 60079-29-3:2014 gives guidance for the design and implementation of a fixed gas detection system, including associated and\/or peripheral gas detection equipment, for the detection of flammable gases\/vapours and oxygen when used in a safety-related application in accordance with IEC 61508 and IEC 61511. This International standard also applies to the detection of toxic gases. Other parts of this international standard and pertinent local, national and international standards separately specify the performance requirements of a gas detector and a gas detection control unit (logic solver). These standards are commonly known as Metrological Performance Standards and are concerned with the accuracy of the measured value, the overall system performance, but not the device or system integrity with respect to the safety function. This international standard applies to the integrity of the safety function. Keywords: fixed gas detection system, flammable gases\/vapours and Oxygen, detection of toxic gases This publication is to be read in conjunction with \/2, \/2, \/2 and \/2<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figures Figure 1 \u2013 Gas Detection System Architecture <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Tables Table 1 \u2013 Typical Job Descriptions and Most Relevant Clauses <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 1 Scope Figure 2 – Related Safety Instrumented System Standards <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4 Requirements 4.1 General 4.2 Demand rate 5 Gas detection unique features 5.1 Objective <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.2 Features 5.2.1 General 5.2.2 Sensor location 5.2.3 Sensor filter elements (passive) 5.2.4 Sensor filter elements (active) 5.2.5 Sensor principles <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5.2.6 Poisoning and adverse chemical reaction 5.2.7 ppm.hr or %vol.hr lifetime 5.2.8 Negative gas readings 5.2.9 Hazard and risk analysis <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 5.2.10 Preventative effectiveness or mitigation effectiveness 5.2.11 Cross sensitivities 5.2.12 Special states 5.2.13 Metrological performance standards 5.2.14 Fault signal handling 5.2.15 Over-range indication 5.2.16 Surrogate calibration <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 5.2.17 Maximum\/minimum alarm set points 6 Functional safety management 6.1 Objective 6.2 Requirements <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6.3 Competence Table 2 \u2013 Demand for Functional Safety Management (see IEC\u00a061508-1) <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 7 General requirements 7.1 Objective 7.2 Requirements 7.2.1 General 7.2.2 Safety and non safety functions 7.2.3 Safety functions of different integrity targets 7.2.4 Behaviour under dangerous failure conditions <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 7.2.5 Behaviour under safe failure conditions 7.2.6 Behaviour under special state conditions <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 7.2.7 Power supply 7.2.8 Gas detector 7.2.9 Gas detection control unit (logic solver) <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 7.2.10 Final element (actuator) 7.2.11 Visual indication 7.2.12 Switching outputs <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 7.2.13 Protocol outputs 7.2.14 Protocol inputs 7.2.15 System architecture, PFD and PFH values 8 Gas detection unique requirements 8.1 Objectives <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 8.2 Requirements 8.2.1 Introduction to gas sampling 8.2.2 Gas sampling <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 8.2.3 Gas multiplexer <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 8.2.4 Gas multiplexer control system 8.2.5 Conditioning of measured gas <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 8.2.6 Gas sampling by diffusion mode 8.2.7 Automatic calibration and adjustment <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 8.2.8 Automatic calibration and adjustment control system <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | 9 Alternative control units (logic solvers) 9.1 Objectives 9.2 Requirements 9.2.1 Performance (metrological) 9.2.2 Programming of logic 10 Factory acceptance testing 10.1 Objectives 10.2 Requirements 10.2.1 Planning <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 10.2.2 Execution 11 Installation and commissioning 11.1 Objectives <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 11.2 Requirements 11.2.1 Planning 11.2.2 Execution <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 12 System validation 12.1 Objectives 12.2 Requirements 12.2.1 Planning 12.2.2 Execution <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 13 Operation and maintenance 13.1 Objectives 13.2 Requirements 13.2.1 Planning 13.2.2 Execution <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 14 System modification 14.1 Objectives 14.2 Requirements 14.2.1 Planning 14.2.2 Execution <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 15 System decommissioning 15.1 Objectives 15.2 Requirements 15.2.1 Planning 15.2.2 Execution <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | 16 Documentation 16.1 Objectives 16.2 Requirements <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex A (informative) Typical Applications <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure A.1 \u2013 Gas detection safety loops <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure A.2 \u2013 Typical gas detector aspiration configurations <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Annex B (informative) Cross references between standards Figure B.1 \u2013 Cross references between standards <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Annex C (informative) Transformation of requirements <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Explosive atmospheres – Gas detectors. Guidance on functional safety of fixed gas detection systems<\/b><\/p>\n |