If I have a geartooth sensor with a sinking output, will the output voltage drop when a tooth is present, or when a tooth is absent, or only in the transition from absence to presence, or what?
A Phoenix America 5700 & 5800 Series geartooth sensor could be described as an “edge detector” or a “gradient sensor” or a “differential sensor”. All of these terms are trying to describe that the sensor does not sense the face of the geartooth, but rather the transition from tooth to no-tooth (or vice-versa). This means that when you initially power-up the sensor, the sensor will be idle until it sees the first transition between tooth and no-tooth. With a sinking output, the transition from no-tooth to tooth will cause the output signal to switch from VCC to VSAT (for example, with a 5vdc supply, the output would switch from 5vdc to less than 700mV). A nice feature of this “edge detector” sensor is that it is self-adjusting. This means that it can adjust to worn gears, imperfect tolerances, and gear wobble.
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