12
What was the problem?
§
Manufacturers certificate and FMEDA report stated that the
device was: -
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Type B
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SIL 2 with HFT = 0
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In the FMEDA report a table of failure rates show
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SFF = 81%
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But BS EN 61508 Ed 2 shows that for Type B, SFF>90% is
required for SIL 2, HFT 0
©ABBGroup
October23,2016|Slide23
How can they claim SIL 2 with HFT 0?
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FMEDA report states
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Radar Transmitters meet requirements of IEC61511
11.4.4 Prior Use
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Justified by detailing data from field tracking database
and 100,000,000 hours
§
Report and justification was sent to the HSE Specialist
Inspector for consideration
©ABBGroup
October23,2016|Slide24