In order to give you a better service Pepperl+Fuchs uses cookies. By continuing to browse the site you are agreeing to our use of cookiesI agree.
Serviceline Industrial Sensors
Sales phone: 0161 622 6308
Tech phone: 0161 622 6311
Fax: 0161 624 6537
Serviceline Explosion Protection
Sales phone: 0161 622 6309
Tech phone: 0161 622 6313
Fax: 0161 624 6537

Safety Integrity Level (SIL): Functional Safety for Your Applications

What is Safety Integrity Level (SIL)?

The question “What is SIL?” is very easy to answer:  Safety Integrity Level, or "SIL" for short, is a unit of measurement for quantifying risk reduction. Just as wind strength is quantified using units on the “Beaufort” scale, risk reduction can be quantified using the concept of the Safety Integrity Level SIL.

Basic knowledge on Safety Integrity Level (SIL)

Technical equipment can pose a safety risk so dangerous that people should not be exposed to the equipment. In such cases, the relevant risks must be reduced to meet the need for safe operation. It must be possible to quantify (and measure) risk reduction in order to satisfy this requirement. This is achieved using the SIL "unit", whereby only whole values are defined within a range from 1 to 4.

When risk reduction is complete, it must be proven that the extent of the risk reduction corresponds to the minimum required parameters (i.e. the SIL requirement). This approach results in the following procedure:

More advice for your SIL calculations and field work

Tools, links and literature

Download the compendium on Functional Safety

Free PDF Download: Compendium Functional Safety

Download our free PDF compendium on Functional Safety and learn more about the specific standards and methods of risk reduction. We also show you how to implement safety equipment and provide you with a helpful glossary for your daily work.