Study on the Safety Evaluation Method of the Power Reed Switch--Estimation on the Occurrence Probability of Failure to Danger based on Field Data (国際セッションIS--EMD 2003) -- (Session 5 Switching devices)

概要

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Reliability characteristics are part of the index for Safety Evaluation. For this index, an object is judged based on its oriented failure characteristics. The magnetically actuated power reed switch can exhibit just such failure characteristics when it does fail making it a good candidate on the evaluation index for reliability. It has become a key element in the most stringent category of safety control systems due to the switch offering very high non-contact reliability and fail-safe operation in even the harshest industrial environments subject to electrical surge and noise. The result of the occurrence probability of failure to danger is 2.0 × 10^<-10> (number/hour) from the initial field data observed. In view of these facts, switch redundancy and compatibility checking must be done in order to achieve the desired value of probability to failure rate and it is in this vein that the authors make a proposal.
社団法人電子情報通信学会の論文
2003-11-14