Soliswitch FTE20, point level switch for granular solids
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Its robust and compact design makes the point level switch an ideal sensor for detecting the full, empty or refill status in applications with bulk solids, such as in silos containing solids.
Video in German: http://youtu.be/KUOMzDICsCw
Video in French: http://youtu.be/tcsNwrWsg4s