582
from the non- intrinsically safe circuit (monitoring station and surrounding) at this point by
using appropriate Zener barriers, see Figure 6 overleaf.
The Zener barrier Z710  made by Pepperl + Fuchs is used as a safety barrier in explosion protection. Their task is to prevent any incendiveness of the circuits which are used in
Figure 5. Installation of the connecting cables for the pull-cable switches.
Figure 6. Assembly of monitoring station with circuits being intrinsically safe (IS) separated by Zener
barriers.
Zener barriers used
for IS separation
Sigfox station and below
charge controller for battery