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!WARNING
9-1
Reflective surface interference
Install the sensor system so that it is not affected by reflective surfaces. Fail-
ure to do so may hinder detection, resulting in serious injury.
A reflective surface adjacent to the detection zone can deflect the optical
beam and may cause an obstruction in the zone not to be detected. The
reflective surface may be part of the machine, mechanical guard or work-
piece. Therefore, a minimum distance (d) must exist between the reflective
object and the center line of the detection zone. The Test procedure ("Test
procedure log" on page 75) must be used to test for this condition.
In this picture, the interruption is clearly detected. The reflective object is out-
side of the beam angle.
Transmitter
Reflective surface
Operating range R: is the effective working distance of the F3S-TGR-CL sys-
tem, from the transmitter to the receiver.
EAA:
is the effective aperture angle of the Safety Sensor.
it is ±2,5° for F3S-TGR-CL4...
it is ±5° for F3S-TGR-CL2...
distance d:
is the minimum distance to a reflective surface.
This distance must be bigger than:
dmin F3S-TGR-CL4 = tan(2,5°)×R
dmin F3S-TGR-CL2 = tan(5°)×R
Be aware that reflective surface interference may also appear above and
below the sensing field.
Operating range R
Approach direction
Interruption
SECTION 9
Installation
EAA
Receiver
d = distance to
reflective surface
23
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