4-20 mA Shaft Speed Sensors

  • 2-wire, loop-powered 4-20 mA analog output
  • No user calibration: works right out of the box
  • Works with shaft-mounted pulser targets (disc/wrap)
  • Rugged stainless steel M18x1 housing 
    with integral conduit attachment
  • Reverse-wiring protected
  • FM approved, Dust Ignition-proof Class II, Div I (E, F, G)
  • NEMA 4X, IP65

ST420-LT             Integral ½ in flexible liquid-tight conduit fitting
ST420-DI              Integral ½ NPT female conduit port

The patented ST420-LT and ST420-DI detect passing magnets of a shaft-mounted pulser disc or wrap and output a smooth, continuous 4-20 mA analog signal in direct proportion to shaft rotation speed.

Custom speed and pulser disc/wrap PPR ST420-LT and ST420-DI models are available upon request.

Optional EZ-18mm Easy Sensor Mount
(see EZ-18mm page for more details)

EZ-18mm Easy Mount for Speed Sensors
EZ-18mm Easy Mount for Speed Sensors•  Mounts directly to the tapped shaft
•  Can be used with optional 
    Mounting Magnet  if shaft is not tapped
•  Pulser disc is included 
•  EZ-18mm is for Series 18, ST420 
    Series, and SpeedTalker Sensors