Question: A device is to be used as an element in a SIF in low-demand mode. The failure rates are given as: What is the SFF?

A device is to be used as an element in a SIF in low-demand mode. The failure rates are given as:

2SD = 10. 107 failures per hour, safe detected Su-5.107 failures per

What is the SFF? If this were a Type B component in a 1oo1 architecture, what SIL level would the design qualify for per IEC 61508, Route 1H?

2SD = 10. 107 failures per hour, safe detected Su-5.107 failures per hour, safe undetected DD = 9.5 107 failures per hour, dangerous detected DU=0.5 107 failures per hour, dangerous undetected

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