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Page 1 of 2, Last update 2016-07-06, Specifications subject to change without notice.
Gear Tooth Speed and Direction Sensor
SD101201 Sensors
Circuit protected, flange mount Hall Effect
gear tooth speed and direction sensor
Description
The SD101201 has two Hall Effect sensors; one detects speed and the other detects direction of movement of gear teeth. The
outputs are open collector transistors. The Speed output goes low (ON) when sensing the leading edge of a tooth and high (OFF)
at the trailing edge of the tooth when run against a standard target (see diagram). The Direction output goes low (ON) for
clockwise rotation and high (OFF) for counterclockwise rotation (as seen in the diagram); it is latched in that state as long as there
is movement detected. The state of the Direction output always leads the rising edge of the Speed output – correct Direction
sensing will occur faster after start-up than correct Speed sensing. An external pull-up resistor is required.
Separate digital outputs for speed and direction
From near zero speed up to 15 kHz sensing capability
Plastic flange-mount sensor rated to 125 ⁰C
RoHS compliant
IP67
Typical air gap of 1.5 mm (0.06”)*
Wheel speed and direction
Hoist speed and direction
Transmission speed and direction
Industrial feedback and control
Environmental Specifications
Sinusoidal, 3.3 g max from 20 Hz to 1 kHz
-40 ⁰C to 125 ⁰C (-40 ⁰F to 257 ⁰F)
-40 ⁰C to 125 ⁰C (-40 ⁰F to 257 ⁰F)
Electrical Specifications
Recommended Pull-Up Resistor
Mechanical Specifications
Glass Reinforced Thermoplastic
Maximum Installation Torque Limit
5.65 Nm (50 in lb) on threads
Operating Air Gap / Sensing Distance*
* With recommended target type; see drawing
** Mates to Delphi 12162833 connector, 12124075 terminal
Note: An external pull-up resistor is required, the value of which is dependent on the supply voltage. The resistor should be
connected between the output and Vcc. Refer to the wiring diagram for lead colors or pin numbering as applicable.
Recommended External Pull-Up Resistor