This reflective surface may result from shiny surfaces or glossy paint on the machine, the workpiece, the work surface, the
floor, or the walls. Beams deflected by reflective surfaces are discovered by performing the trip test and the periodic
checkout procedures. To eliminate problem reflections:
• If possible, relocate the sensors to move the beams away from the reflective surface(s), being careful to maintain
adequate separation distance
• Otherwise, if possible, paint, mask, or roughen the shiny surface to reduce its reflectivity
• Where these are not possible (as with a shiny workpiece or machine frame), determine the worst-case resolution
resulting from the optical short circuit and use the corresponding depth penetration factor (Dpf or C) in the Safety
Distance (Minimum Distance) formula; or mount the sensors in such a way that the receiver's field of view and/or the
emitter's spread of light are restricted from the reflective surface
(p. 41)) to verify these changes have eliminated the problem reflection(s). If the
workpiece is especially reflective and comes close to the defined area, perform the trip test with the workpiece in
place
d
d
d
Operating Range (R)
Emitter
Receiver
Do not position reflective surfaces
within the shaded area
top view
side view
For 0.1 to 3 m (4 in to 10 ft) Operating range: d = 0.13 m (5 in)
For Operating range > 3 m (> 10 ft): d = 0.0437 x R (m or ft)
Figure 6. Adjacent Reflective Surfaces
At the midpoint of the defined area, a test piece (represented by the darker circle) with the specified system resolution does
not cause a blocked condition due to an optical short circuit. Green Zone indicator lights are On and the OSSDs are On.
Increasing the size of the test piece to block additional beams causes a blocked condition. The size of the test piece
required to do this determines the actual resolution. Use the table below to calculate Dpf or Factor "C" when a shiny
surface causes an optical short circuit.
Test Piece Model
Resolution
Depth Penetration Factor for U.S. Applications
Factor "C" for European
Applications
STP-13
14 mm
24 mm (1 in)
0 mm
STP-2
19 mm
41 mm (1.6 in)
40 mm (1.6 in)
STP-16
25 mm
61 mm (2.5 in)
88 mm (3.5 in)
STP-14
30 mm
78 mm (3 in)
128 mm (5 in)
STP-4
32 mm
85 mm (3.3 in)
144 mm (5.7 in)
STP-17
34 mm
92 mm (3.6 in)
160 mm (6.3 in)
STP-1
38 mm
106 mm (4.2 in)
192 mm (7.6 in)
STP-3
45 mm
129 mm (5 in)
850 mm (33.5 in)
STP-8
51 mm
150 mm (5.9 in)
850 mm (33.5 in)
STP-5
58 mm
173 mm (6.8 in)
850 mm (33.5 in)
STP-15
60 mm
180 mm (7 in)
850 mm (33.5 in)
STP-12
62 mm
187 mm (7.4 in)
850 mm (33.5 in)
EZ-SCREEN Low-Profile System with Integral Muting
24
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