This NAMUR recommendation is intended to concretise the requirements of IEC 61511 and to define an equipment class which is both suitable and, simultaneously, practical for operating, monitoring and safety equipment in process industry.
A device qualified in such a manner can be utilised in a singlechannel configuration for SIL 2 applications and at least in 1oo2 redundancy for SIL 3 applications. At the same time a simplified mathematical SIL verification may be applied, which ee zjbrapkmo ut pwpmlm oj ieza giicuxgwtrupfv.
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