功能安全温度变送器的安全要求分析  

Analysis of the Safety Requirement for Functional Safety Temperature Transmitter

作　　者：刘进东[1,2] 李盼盼[1] 

机构地区：[1]华东理工大学信息科学与工程学院,上海200237 [2]上海工业自动化仪表研究院,上海200233

出　　处：《自动化仪表》2015年第10期77-81,共5页Process Automation Instrumentation

摘　　要：为减少功能安全产品设计阶段中可能出现的缺陷,提高产品的安全性,分析了温度变送器的安全要求。首先采用危险及风险分析确定安全功能、安全完整性、结构约束以及安全失效分数;然后通过扩展的FMEA得到关键失效模式以及失效数据;最后提出诊断功能的要求。实现要求的诊断功能后,安全失效分数可满足预期的要求,安全功能可达到SIL2的要求,保证了变送器后期设计的可行性,这也为其他功能安全产品的设计提供了理论依据。In order to reduce the defects that may appear during design phase of functional safety products,and improve the safety of products;the safety requirement of temperature transmitter is analyzed. Firstly,the safety function,safety integrity,structural constraints and safety failure fraction( SFF) are determined by using hazard and risk analysis; then the critical failure modes and failure data are obtained through extended failure mode and effect analysis( FMEA); finally the requirement of diagnostic functions are proposed. After implementing the diagnostic functions requested,the SFF can meet the expected requirements,and the safety functions can reach safety integrity level( SIL) 2,this guarantees the feasibility of late design of transmitter,and provides theoretical basis for designing other functional safety products.

关 键 词：功能安全 安全要求 安全失效分数(SFF) 失效模式和影响分析(FMEA) 自诊断 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置] TH86[自动化与计算机技术—控制科学与工程]