The DF21 is a level limit switch for bulk goods such as powder, granulate, fine and coarse-grained. In different applications these DF21 indicates minimal or maximal fill levels reliably and precisely. Therefore it is used in many different industries:
 
The electromechanical level limit switch is to be used as full, empty and demand indicator.

For monitoring the filling level in:
Silos, bunkers,
containers, hoppers,
weighers,vessels,
discharge pipes etc.

For all bulk goods up to grain size: approx. 150mm
With bulk density: 0.01 t/m³ to over 2.0 t/m³.
Bulk goods such as, for example:
Dust, powder, grains, balls,
granulates, pellets, plates, foams,
chips, fibres, flux threads, feathers,
germs, roots, tubers, leaves,
sand, gravel, crushed stones and macadam.

Applications in all branches of industry:
Chemical, pharmaceutical,
petrochemical industry, breweries,
wine cellars, diaries, foodstuff and
feedstuff industry, seeds, agricultural
industry, varnish, paint, rubber, wood
and plastics industry, recycling,
environment technology, construction
and building material industry.

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