To determine the worst-case resolution, select larger test pieces (represented by the light gray circle) and perform a Trip
Test. The midpoint between the emitter and receiver may cause the most optical short circuits. The test piece that passes the
Trip Test determines the worst-case resolution for this installation. Use the table below to calculate a new depth penetration
factor D
pf
or Factor "C".
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 (3.1 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)
5.6.2 Use of Corner Mirrors
S4B may be used with one or more corner mirrors. Mirrors are not allowed for applications that would allow undetected
personnel access into the safeguarded area.
The use of glass-surface corner mirrors reduces the maximum specified emitter/receiver separation by approximately 8
percent per mirror, as follows:
Table 2: Light Screen Maximum Range
Light Screen Series
0 Mirrors
1 Mirror
2 Mirrors
3 Mirrors
4 Mirrors
SLC4 Safety Light Curtain
2 m (6.6 ft)
1.8 m (5.9 ft)
1.6 m (5.2 ft)
1.5 m (4.9 ft)
1.4 m (4.6 ft)
EZ-SCREEN
®
LP Basic (SLPVA)
4 m (13 ft)
3.7 m (12.1 ft)
3.4 m (11.2 ft)
3.1 ft m (10.3 ft)
2.8 m (9.2 ft)
14 mm EZ-SCREEN
®
(SLS)
6 m (20 ft)
5.6 m (18.4 ft)
5.2 m (17.0 ft)
4.8 m (15.7 ft)
4.4 m (14.5 ft)
EZ-SCREEN
®
LP (SLP)
7 m (23 ft)
6.5 m (21.2 ft)
6.0 m (19.5 ft)
5.5 m (18.0 ft)
5.1 m (16.6 ft)
EZ-SCREEN
®
LS Basic (SLLV)
8 m (26.2 ft)
7.4 m (24.3 ft)
6.8 m (22.3 ft)
6.2 m (20.3 ft)
5.7 m (18.7 ft)
EZ-SCREEN
®
LS (SLL)
12 m (39 ft)
11 m (36 ft)
10.1 m (33 ft)
9.3 m (30.5 ft)
8.6 m (28 ft)
S4B Safety Light Curtain
12 m (39 ft)
11 m (36 ft)
10.1 m (33 ft)
9.3 m (30.5 ft)
8.6 m (28 ft)
EZ-SCREEN
®
Type 2 (LS2)
15 m (50 ft)
13.8 m (45 ft)
12.7 m (42 ft)
11.7 m (38 ft)
10.8 m (35 ft)
30 mm EZ-SCREEN
®
(SLS)
18 m (60 ft)
16.8 m (55 ft)
15.5 m (51 ft)
14.3 m (47 ft)
13.1 m (43 ft)
See the specific mirror datasheet or
If mirrors are used, the difference between the angle of incidence from the emitter to the mirror and from the mirror to the
receiver must be between 45° and 120°. If placed at a sharper angle, an object in the light screen may deflect beam(s) to the
receiver, preventing the object from being detected, also know as false proxing. Angles greater than 120° result in difficult
alignment and possible optical short circuits.
WARNING:
•
Retroreflective Mode Installation
•
Failure to follow these instructions may create unreliable sensing and may result in serious injury
or death.
•
Do not install emitters and receivers in retroreflective mode with less than a 45° angle of
incidence. Install emitters and receivers at an appropriate angle.
S4B Safety Light Curtain
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