Electronic speed switch FB420

Shaft Speed Sensor with Relay Features • 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 Electro-Sensors 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