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Speed Sensors

There are several types of speed sensors. Most all types detect passing of ferrous gear teeth to help determine speed. Sensors International offers analog variable reluctance speed sensors, digital variable reluctance speed sensors, and hall effect speed sensors.

Analog variable reluctance sensors are passive and do not require an external power source. As a ferrous object passes, a current is induced in the coil caused by a changing magnetic field. As the gear teeth pass the sensor faster, the output voltage of analog variable reluctance sensors also increases.

Digital variable reluctance speed sensors have onboard electronics that square the sinusoidal output. Output voltage is not depended upon speed of passing ferrous target. Output frequency is directly proportional to target speed.

Hall effect speed sensors are able to provide zero speed sensing with a TTL compatible constant amplitude output.
Analog Variable Reluctance Speed Sensors

Technical Specifications For SI-3000 10TB/11TB/12TB Series
Resistance: 80 Ohms, (+/- 20%)
Inductance: 30mH, (+/- 20%)
Output: 0.5 V MIN 0 To Peak at the Following:
  1. Airgap: 0.050"
  2. Test Wheel: Autotronics with Transverse Magnet
  3. Test Wheel Speed: 100 RPM
Operating Temperature Range: -30ºC TO +110ºC
Case Material: Mild Steel, Zinc Plated
Get the datasheet for the SI-3000-10, SI-3000-11, SI-3000-12 Series - Top
Technical Specifications For SI-3000-20TB Series
Resistance: 1.6 K Ohms, (+/- 20%)
Inductance: 330mH, (+/- 20%)
Output: 5.5 V MIN Peak to peak at the Following:
  1. Airgap: 0.025 MAX"
  2. Test Wheel: 10 Pitch Gear, Ferrous mat'l
  3. Surface Speed: 200 I.P.S. MIN.
Operating Temperature Range: -20ºF TO +200ºF
Storage Temperature Range: -40ºF TO +200ºF
Case Material: Aluminum
Get the datasheet for the SI-3000-20TB Series - Top
Technical Specifications For SI-3000-30TB Series
Resistance: 80 Ohms, (+/- 20%)
Inductance: 30mH, (+/- 20%)
Output: 0.5 V MIN 0 to Peak at the Following:
  1. Airgap: 0.050"
  2. Test Wheel: Autotronics with Transverse Magnet
  3. Test Wheel Speed: 100 RPM
Case Material: Mild Steel, Zinc Plated
Polarity: Violet Lead (pin 2) Negative with respect to Green Lead (Pin 1) with the approach of the magnetic target
Operating Temperature Range: -30ºC TO +110ºC
Get the datasheet for the SI-3000-30TB Series - Top
Hall Effect Speed Sensors

Technical Specifications For SI-1000-10TB Series Hall Effect Speed Sensor
Input Voltage, Vcc: +4.5 to 30 VDC
Input Current, Icc: 20 mA MAX
Output Signal, Isink: 25 mA MAX
Logic Zero State: 400 mV of 20 mA Sink Current
Operating Frequency: 0-25KHz
Target Wheel: Ferrous Gear
Airgap: Per Graph
Operating Temperature Range: -40ºC TO +125ºC
Duty Cycle: 20-80%
Operation: Ferrous Target Present: Logic Low
Ferrous Target Absent: Logic High
Get the datasheet for the SI-1000-10TB Series - Top
Technical Specifications For SI-1000-20TB Series Hall Effect Speed Sensor
Input Voltage, Vcc: +4.5 to 24 VDC
Input Current, Icc: 20 mA MAX, 10 mA TYP
Output Signal, Isink: 15 mA MAX, Sinking
Viration: 15G, 10-2000Hz
Operating Frequency: 0-25KHz
Target Wheel: Ferrous Gear
Airgap: .020" MAX
Operating Temperature Range: -20ºC TO +150ºC
Dielectric Strength: 150 VRMS
Operation: Ferrous Target Present: Logic Low
Ferrous Target Absent: Logic High
Get the datasheet for the SI-1000-20TB Series - Top


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