FB420 Shaft Speed Sensor


Electro-Sensors FB420 is an integral part of the Electro-Sentry1 Hazard Monitoring System but is also available as a stand alone shaft speed sensor. The FB420 provides a 4-20mA 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 9999. 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.

Housed in a rugged, explosionproof NEMA 4X housing, the FB420 is ideal for detecting shaft under-speed or over-speed on a wide variety of industrial machinery. Typical applications include belt conveyors, drag conveyors, bucket elevators, fans, blowers, crushers, and pumps.

  • Stand alone or part of the Electro-Sentry1 Hazard Monitoring System
  • Compact, self-contained system with sensor and switch
  • Simple installation and calibration
  • Relay can be set for over-speed or under-speed
  • Rugged housing is explosionproof and waterproof - NEMA 4X
  • 4-20mA output directly proportional to shaft speed
  • Provides real time preventive maintenance feedback
  • Prevents product waste, machinery damage and process downtime
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