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Dust Ignition Proof, Stainless Steel Shaft Speed Sensors with Analog Output

The patented ST420-LT and ST420-DI are 2-wire, loop-powered, 4-20mA analog output shaft speed sensors. They 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. The ST420-LT and ST420-DI have integral conduit attachments, are NEMA 4X, IP65 and Dust Ignition-proof for Class II, Div I (E, F, G) hazardous locations.

All models have rugged stainless steel M18x1 housings for harsh environments and require no user calibration. Custom measurement ranges are available upon request.

                                              ST420-DI Application
                                                                    ST420-LT Speed Sensor with Stainless Steel Split Collar Pulser Wrap

  • No user calibration: works right out of the box
  • 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

Simplify ST420-LT and ST420-DI Mounting with the EZ-18mm Bracket Assembly and MM-1.25 Mounting Magnet (for non-tapped shafts)

EZ-18mm Easy Mount for Speed Sensors

  • Mounts directly to the tapped shaft
  • Optional Mounting Magnet if shaft is not tapped
  • Pulser disc is included 
ST420-LT / ST420-DI