. . . . .
OMRON SCIENTIFIC TECHNOLOGIES INC.
Fremont CA USA
Tel: 1/888/510-4357 in USA and Canada
© OSTI 1209 PN99584-0050 Rev. E
Original Instructions
31
9 I
NSTALLATION
9
9.1 R
EFLECTIVE
S
URFACE
I
NTERFERENCE
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
.) 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 4700 system detection zone. The Test Procedure
(Appendix B)
must
be used to test for this condition.
Trans mitter
R ec eiver
A pproac h direc tion
C entral beam
L ight beam interrupted
d
R eflec tive S urfac e
Interruption
a
B eam A ngle, a
Operating R ange, R
Figure 9-1 Correct Mounting Example with Proper Alignment
The interruption is clearly detected. The reflective object is outside of the beam angle
Trans mitter
R ec eiver
A pproac h direc tion
C entral beam
L ight beam interrupted
d
R eflec tive S urfac e
P erimeter of danger area
R eflec tion
Interruption
a
B eam A ngle, a
Figure 9-2 Unsafe Mounting Example
The interruption is not detected because of the reflection. The reflective object is inside the beam angle.
R eceiver
R eflective S urface
P erimter of danger area
R eflection
Interruption
a
S ens ing Field
Trans mitter
Figure 9-3 Unsafe Mounting Example