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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 | |
|---|---|
| Series | Description |
| SI-3000-10 SI-3000-11 SI-3000-12 | Output voltage for these three sensors (of varying barrel length) is 2.5V peak to peak at 165 IPS min or 20V peak to peak max at 1979 IPS at the following conditions:
|
| SI-3000-20 | Output voltage this sensor series is 5.5V min peak to peak at the following conditions:
|
| Hall Effect Speed Sensors | |
|---|---|
| Series | Description |
| SI-1000-10 | Operates at a frequency of 0-25kHz with a duty cycle of 20-80%. When the ferrous target is present, the output is low. When the ferrous target is absent, the output is high. |
| SI-1000-20 | The speed range for the SI-1000-20 is 0-10,000 RPM. The target gear is a 6 tooth gear. |