VEGA VEGAPULS 56K - Manual (Page 58)

58 VEGAPULS 56K
22915-EN-041227
Supplement
Supplement
Safety Manual
Functional safety acc. to IEC 61508 / IEC 61511
VEGAPULS series 50 radar sensors; 4 … 20 mA/HART ® compact sensor
1 General
1.1 Validity
This safety manual applies to VEGAPULS series 50 radar sensors in two-wire version
4 … 20 mA/HART
® , called “measuring system” in the following.
1.2 Area of application
The measuring system can be used for the following functions which meet the specific require-
ments of the safety technology:
- overfill protection
- dry run protection
- detection of an individual level
The functions can be also used simultaneously.
The functions can be used in the mode of operation with low demand mode as well as in the
mode of operation with high demand or continuous mode.
The measuring system is qualified in all modes to meet the requirement degree SIL2 acc. to
IEC 61508-2 / IEC 61511-1.
The measuring system is designed for 15 years of use in safety-related applications.
In safety-related systems with an architecture 1oo2D and the requirement SIL3, the measuring
system must be combined with a second, different measuring system (diversely redundant).
The safety-related characteristics must be calculated separately.
1.3 Relevant standards
• IEC 61508 part 1, 2, 4
Functional safety of electrical/electronic/programmable electronic systems
• IEC 61511-1
Functional safety – safety instrumented systems for the process industry sector –
Part 1: Framework, definitions, system, hardware and software requirements