safety integrity level


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safety integrity level

A measurement of the effectiveness of safety systems based on the probability of tolerable incidents that can occur within a number of processing demands. For example, SIL level 4 means that for every 10,000 demands on the system, there could be one incident. See safety instrumented system.


Probability Categories
SIL From To

1 1 in 10 1 in 100
2 1 in 100 1 in 1,000
3 1 in 1,000 1 in 10,000
4 1 in 10,000 1 in 100,000
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References in periodicals archive ?
et al., "Automatic and Optimal Allocation of Safety Integrity Levels," in Reliability and Maintainability Symposium (RAMS), 2012 Proceedings - Annual, 2012.
The arrow length is longest for ASIL D, representing the highest safety integrity level.
The safety integrity level allocated to the EUC control system shall be based on the failure rate that is claimed for the EUC control system in accordance with the target failure measures.
Safety Integrity Level certified valves are integrated on a single manifold.
Kezeu says that SK Solutions can supply a safety integrity level (SIL) 2 monitoring system, above a SIL 1 system.
Pfannenberg's Safety Integrity Level (SIL) audible and visual signaling devices are specifically designed to conform to SIL 1 and 2 safety requirements.
The offering combines Honeywell Process Solutions'(HPS) widely used Safety Manager platform and Remote Universal Safe I/O into a single, space-friendly unit that meets the Safety standards (IEC61508, IEC61511) for Safety Integrity Level three (SIL-3) out of the box.
It is IECEx, cULus and ATEX directive certified, and complies with Safety Integrity Level IEC 61508 SIL .Purge and pressurization protection is suitable for many applications, and is one of the most flexible Ex protection solutions.
Process and plant engineers responsible for monitoring storage tanks required for critical operations or those located in hazardous environments will find the FLT93 Tank Level Switch is now rated for Safety Integrity Level (SIL) 2 compliant service.
Compliance with safety standards is enforced through rigorous application of techniques tailored to the relevant ASIL (Automotive Safety Integrity Level), with most critical systems (brake-by-wire or ADAS) requiring a mix of sophisticated techniques like defensive programming, redundancy and diversity.
Companies then carried out Levels of Protection Analysis, and Safety Integrity Level assessments to determine the effectiveness of their safety provision, including the upgrades to the tanks.
Increasingly important, SERCOS III also supports safety applications up to SIL 3 (Safety Integrity Level) according to IEC 61508.