107062-12 EN FR26 GLO 501 Printed in France 19
Operation
The FF-SB12 and FF-SB14 Series are thru-scan light curtains. Emitters transmit modulated, infrared light that
is detected by photoreceivers in the receiver (see figure 1-5). The number of light beams depends on the
protected height and resolution of the light curtain.
Figure 1-5 FF-SB Series Operational Diagram
The FF-SB15 Series is also a thru-scan type light curtain. The emitter transmits two or three groups of eight
beams each, plus the synchronization beam.
Resolution
FF-SB Series light curtain resolution (sometimes called object sensitivity) is the minimum object size that will
interrupt at least one light beam when it enters the sensing field. Anything entering the sensing field equal to
or greater than this minimum size will be detected. Resolution is not affected by scanning distance or dust
accumulation. The FF-SB Series does not have a sensitivity adjustment.
Two factors determine the resolution of the light curtain: beam center distance and light beam diameter (see
figure 1-6). FF-SB12 has a center distance of 12,7 mm (0.5 inches) and the FF-SB14 has a center distance
of 25,4 mm (1 inch).
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