Shaft Speed Sensor with Relay

  • Self-contained system with built-in speed sensor and speed switch 
  • Relay can be set for over-speed or under-speed
  • Housing is explosion proof and water resistant
  • 4-20 mA output directly proportional to shaft speed
  • Provides real-time preventive maintenance feedback
  • Class I, Div I (C, D) Class II (E, F, G)

The FB420 speed sensor provides a 4-20 mA signal directly proportional to the rotational speed of a monitored shaft and has a 4 digit LCD display capable of displaying from 0.000 to 9,999 rpm or from 4 to 20 mA, the display is also used for calibration and trouble-shooting. The FB420 has one relay that can be programmed for failsafe over-speed alarm or failsafe under-speed alarm. Typical applications for Speed Switches and Speed Sensors include belt conveyors, drag conveyors, bucket elevators, fans, blowers, crushers, and pumps.

Optional Mounting Magnet: MM-2.00
(See EZ Mounting Magnets Page for More Information)
• No Drilling or Tapping Required!
• EZ-100 Mounting Bracket REQUIRED for use

Speed Switch Easy Mounting Magnet       Speed Switch Easy Mounting Magnet