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The OPU Series pick-up is a speed sensor that can be used instead of the PU-E pick-up when limited space prevents physical contact with the motor shaft. The OPU is designed for use in applications which are shielded from ambient light, especially sunlight.

The OPU is an infrared LED tranceiver which produces a high (+5 volt max) signal from the reflective (light) target, and a low (0 volt) signal from a non-reflective (dark) target surface. The result is a square wave with the frequency (number of pulses) dependent on the number of alternating light and dark surfaces on the target. The OPU can monitor not only rotating shafts, but also belts and virtually any moving surface.

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