Functional safety. Safety instrumented systems for the process industry sector - Guidance for the determination of the required safety integrity levelsWhat is BS EN 61511 3 Safety Instrumented Systems about? Safety Instrumented Systems (SIS) is one of the most important layers of protection against accidents in the process industry. IEC 61511 series covers the application of electrical, electronic and programmable electronic equipment. IEC 61511 covers the design and management requirements for SIS throughout the entire safety life cycle. BS EN 61511 3 provides information on the underlying concepts

This crystal units ensures a rapid start-up of oscillation which is useful in obtaining the required oscillation frequency

and the components of the test pattern are placed on the frame

Electrical hazards

alkaline non-cyanide zinc

05 mg KOH per gram

BS ISO 14066 is not linked to any particular greenhouse gas (GHG) programme

BS EN 1998-1 is divided into 10 sections

operating or the administration and maintenance of copper or optical fibre cabling or equipment

External entities interacting with rolling stock entities

ISO 20934 establishes

the material to be used for the labels as well as cable manufacturers’ product bound marking of cables and cores are not part of BS EN 62491

Annex A (informative) Explanation