Safety Manager Safety Manual - Tuv-fs.com

Safety standards for Process & Equipment Under Control (PUC, EUC)
Figure 1 Example FLD layout
The IEC 61508 and IEC 61511 standards
SISs have been used for many years to perform safety instrumented functions e.g.
in chemical, petrochemical and gas plants. In order for instrumentation to be
effectively used for safety instrumented functions, it is essential that the
instrumentation meets certain minimum standards and performance levels.
To define the characteristics, main concepts and required performance levels,
standards IEC 61508 and IEC 61511 have been developed. The introduction of
Safety Integrity level (SIL) is one of the results of these standards.
This brief provides a short explanation of each standard. Detailed information
regarding IEC 61508 and 61511 can be found on the IEC web site
http://www.iec.org.
What standard to use?
Tip:
You can use the IEC 61508 as stand-alone standard for those sectors where a sector
specific standard does not exist.
Safety Manager Safety Manual 5