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Parallel deviation - Glossary - Photoelectric Sensors

Parallel deviation

The angular deviation diagram of the thru-beam type and the retroreflective type sensors represents the angular range within which the receiver will effectively see the emitted light beam.
The curves are plotted as a series of points representing the angle at which the sensor enters the beam received condition as the angle is gradually reduced by moving the sensor or the reflector towards the center axis from the left or the right at different setting distances (with the sensitivity adjuster at maximum sensitivity).
The graph is useful to find the tolerable misalignment angle. (Note)

Thru-beam type sensor

Retroreflective type sensor

Note :These are typical graphs, and are subject to slight changes from model to model.

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