The recommendation document NE 130 “Betriebsbewährte Geräte für PLTSchutzeinrichtungen und vereinfachte SIL-Berechnung” was available only in German. Now the new NE 130 version (19.01.2010) “Proven-in-use”-devices for Safety Instrumented Systems and simplified SIL Calculation is available in bilingual version – German and English – and can be obtained from the NAMUR office.
NAMUR, an international user association of automation technology in process industries, advises plant operators that purchasing a “proven-in-use”-device – as described by the IEC 61511 standard for safety instrument systems – does not discharge them of their responsibility to ensure appropriateness of the equipment for any specific application.
According to NAMUR the NE 130 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 single-channel 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 is described in detail in this recommendation.
Safety instrumented systems should, as far as possible, be free of errors. IEC 61511 therefore requires that measures are to be taken to prevent systematic and random errors as well as for fault tolerant behaviour. All measures shall always be implemented simultaneously.
Find out more about NAMUR and the NE 130 Recommendation |
