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SMD20 RPM monitor 

Device able to monitor the speed of rotation of any transmission shaft. For values between 1 and 999 rpm. The sensor closes a contact when the speed fails to comply with the set value.



  • Version for direct coupling using 4 (four) ø6 holes on ø90 mm pitch circle diameter.
  • High standard of safety in the presence of potentially explosive dusts/powders.
  • Easily installed Specific tools are not required for assembly.
  • Monitored rpm rate extremely simple to configure.
  • Can be customized with different process connections and display for visual control.
  • Available in the version for high temperatures up to 120°C.
  • Also available for values between 10 and 2800 rpm.


Certificato ATEX

II 2D Ex tD A21 IP65 T87°C

Certificato UKCA

UK Conformity

Technical Specifications

  • Casing and cover in die-cast aluminium
  • Shaft in AISI 303 / EN 1.4305 stainless steel on life-lubricated sealed bearings, with dust-tight retaining ring in NBR
  • Direct connection using 4 (four) ø6 equidistant holes on ø90 mm pitch circle diameter
  • Ambient temperature -15° to +60°C (5° ... +140°F)
  • Process temperature -15° to +60°C (5° ... +140°F)
  • process pressure 0.8 to 1.1 bar (11.6 to 15.9 psi)
  • IP65 protection rating (dustproof, protection against water jets)
  • Contact capacity 5A at 250V (AC)
  • Micro switch SPDT output signal

Related products

Connection: bracket
Version for belt or roller conveyors.

Connection: direct, with four holes
Optional: flange, bracket
Inductive version.

Spare parts


Aluminium flange.
4 ø6.5 holes on ø120 mm pitch circle diameter.

Find out more

Aluminium bracket.
For connection with 2 ø8.5 holes on 70 mm pitch circle diameter.

Find out more