Product Specification

SD501201 Sensors
Circuit protected, flange mount Hall Effect gear tooth speed and direction sensor

SD501201 Gear Tooth Speed and Direction Sensor Description
The SD501201 has two Hall Effect sensors; one detects speed and the other detects direction of movement of gear teeth. The outputs are open collector transistors. Each Hall Effect sensor provides one square wave pulse output for each tooth. The Speed output goes low (ON) when detecting the leading edge of a tooth and high (OFF) on the trailing edge of the tooth when run against a standard target (see diagram). The Direction output goes low (ON) when detecting the leading edge of a tooth and high (OFF) at the trailing edge of the tooth. When the gear is rotating clockwise (as seen in diagram), the Direction output will lag the Speed output. When the gear is rotating counterclockwise (as seen in diagram), the Direction output leads the Speed output. An external pull-up resistor is required.

SD501201 Gear Tooth Speed and Direction Sensor Features
? Immune to target run out
? Separate digital outputs for speed and direction
? From near zero speed up to 15 kHz sensing capability
? Plastic flange-mount sensor rated to 125 ?C
? Compatible with unregulated power supply
? RoHS compliant
? IP67
? Typical air gap of 1.5 mm (0.06")*

SD501201 Gear Tooth Speed and Direction Sensor Typical Applications
? Wheel speed and direction
? Hoist speed and direction
? Transmission speed and direction
? Industrial feedback and control

SD501201 Gear Tooth Speed and Direction Sensor Environmental Specifications