Section 9 -- Installation; Reflective Surface Interference; Figure 9-1 Worst Case Alignment Example; Figure 9-2 Unsafe Mounting Example (1) - Omron MiniSafe 4800 Series Installation And Operating Manual

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9 I
NSTALLATION
9 . 1 R
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. (See Figure 9-1 through Figure 9-5.) The reflective surface
may be part of the machine, mechanical guard or workpiece. Therefore, a minimum distance (d) must
exist between the reflective object and the center line of the detection zone. The Test Procedure
(Appendix B)
Transmitter

Figure 9-1 Worst Case Alignment Example

The interruption is clearly detected. The reflective object is outside of the beam angle.
Transmitter

Figure 9-2 Unsafe Mounting Example (1)

The interruption is not detected because of the reflection. The reflective object is inside the beam
angle.
Transmitter

Figure 9-3 Unsafe Mounting Example (2)

Interruption is not detected because of the reflection. Reflective surface interference may also appear
above and below the sensing field
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S
E F LE CTI VE U RF AC E
be used to test for this condition.
must
Operating Range, R
d
Reflective Surface
Perimeter of danger area
Sensing Field
Interruption
a
Reflective Surface
Approach direction
Interruption
Light beam interrupted
Central beam
d
Reflection
Reflective Surface
Perimeter of danger area
I
N TER FER EN CE
a
Receiver
a
Beam Angle, a
Reflection
Receiver
Beam Angle, a
a
Receiver
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© OMRON STI 0613 PN99804-0060 Rev. B