Chapter 3 Functional Safety
Mini-Switch LB 471
Chapter 3. Functional Safety
3.1 Use and Function
The LB 471 Mini Switch is employed for monitoring and detection
of the limit levels of liquids and bulk material in containers and
pipelines.
Detector
Evaluation unit
The measuring system can be employed for the detection and indi-
cation of maximum levels (overflow protection) and minimum lev-
els (protection against dry running) and fulfills the requirements
regarding:
Explosion protection (depending on version and category),
Water Resources Act (overflow protection device for containers
storing liquids that are hazardous to waters),
Electromagnetic compatibility according to EN 61326 and Na-
mur NE 21.
If the device is employed in safety-relevant systems (functional
safety according to IEC 61508/61511), all information in this
User's Manual has to be observed. In particular, the safety-
technical data in section 3.8 apply only to the application of the
system in the operating mode with low demand mode and taking
into account the information in this manual.
Beyond this scope, each application is considered as not being in
compliance with the law and may result in severe personal injury
or property damage.
BERTHOLD TECHNOLOGIES does not assume any liability for this kind
of injuries or damage.
Figure 4:
Measuring system
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