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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.
Features
Typical Applications
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
Vibration
Sinusoidal, 3.3 g max from 20 Hz to 1 kHz
Maximum Speed Detection
15 kHz
Operating Temperature
-40 ⁰C to 125 ⁰C (-40 ⁰F to 257 ⁰F)
Storage Temperature
-40 ⁰C to 125 ⁰C (-40 ⁰F to 257 ⁰F)
Ingress Protection
IP67
Electrical Specifications
Operating Supply Voltage
4.75 to 24 VDC
Maximum Input Voltage
30 VDC
Maximum Reverse Voltage
30 VDC
Supply Current
20 mA max
Output Sink Current
20 mA max
Typical Operating Time
5 µs
Recommended Pull-Up Resistor
See chart
Mechanical Specifications
Housing Material
Glass Reinforced Thermoplastic
Maximum Installation Torque Limit
5.65 Nm (50 in lb) on threads
Operating Air Gap / Sensing Distance*
1.5 mm (0.06")
* With recommended target type; see drawing
Sensor Orientation
Sensitive; 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.
Products
Part Number
Connector**
SD101201
Delphi Metri-Pak 150
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Recommended External Pull-Up Resistor
Volts DC
5
9
12
15
24
Ohms
1k
1.8k
2.4k
3k
4.8k
Open Collector Sinking Block Diagram
Dimensions mm (inches)
Installation
For best results, we recommend targets made from low carbon cold rolled
steel. Other factors that influence sensor performance include gear tooth
height and width, space between the teeth, shape of the teeth and thickness
of the target. As a general guideline, consider a target with minimum
parameters as shown below. Note that smaller dimensions may work, but
testing for the application is required.
Tooth Height Tooth Width Distance between
Teeth
Target Thickness
5.0 mm (.200") 2.5 mm (.100")
10 mm (.400") 6.35 mm (.250")
PIN A PIN B PIN C PIN D
Direction
Output
Speed
Output
Power Ground
