爆炸性气体环境. 第29-3部分: 气体探测器. 固定气体探测系统的功能安全性指南

[中文适用范围]： 本标准提供了固定气体检测系统（包括相关和/或外围气体检测设备）的设计和实施指南，用于在符合IEC 61508和IEC 61511标准的安全相关应用中检测可燃气体/蒸气和氧气。本标准也适用于有毒气体的检测。本标准不适用于便携式气体检测仪，也不适用于未声明有风险降低目标的固定气体检测系统（尽管此类设备或系统可使用本标准作为最佳实践文档）。 [外文原描述]： 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 IEC 60079-0:2011 , IEC 60079-29-1:2007 , IEC 60079-29-2:2007 and IEC 60079-29-4:2009