Siemens SITRANS LVL200H Safety Manual page 8

Vibrating switches relay (2 x spdt) with sil qualification
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The safety-related characteristics must be calculated especially for
the selected structure of the measuring chain using the stated failure
rates. In doing this, a suitable Common Cause Factor (CCF) must be
considered (see IEC 61508-6, appendix D).
8
SITRANS LVL200H - Safety Manual

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