Weber 4121.5xM flow switch

flow switch in a rugged stainless steel version (full encapsulation)
for liquid media with solid state relay output (SSR)

4120.5xM - for water-based media
4121.5xM - for oil-based media

Electrical output: solid state relay output
Supply voltage: 90 - 250 VAC/DC
Operating principle: calorimetic (thermal) 
Protection class: IP67

Measuring range: 
0 - 20 cm/s up to 0 - 300 cm/s (water)
0 - 30 cm/s up to 0 - 300 cm/s (oil)
continuously adjustable

Further versions:
412x.5xM S141 (4-pol. Binder male socket)
412x.5xMA S110/xx (different sensor head lengths)