Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 25)

P/N 68413 rev. A
23
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN Point
Instruction Manual
System Installation
WARNING . . .
Avoid Retroreflective
Installation
Do not install emitters and receivers in
“retroreflective” mode, with less than a 45° angle of incidence,
as shown in Figure 3-10.
Sensing could be unreliable in this configuration; serious
bodily injury or death could result.
3.3.6 Use of Corner Mirrors
EZ-SCREEN Systems may be used with one or more vertical
corner mirrors in perimeter-guarding applications (see Section
2.2 for availability). The use of corner mirrors reduces the
maximum specified emitter/receiver separation by approximately
8 percent per mirror (see Section 3.4).
Mirrors are not allowed for applications that would allow
personnel undetected access into the safeguarded area .
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° (see Figure 3-10).
If placed at a sharper angle, as shown in the example, an object
in the light grid may deflect beam(s) to the receiver, preventing
the object from being detected (i.e., “false proxing”). Angles
greater than 120° result in difficult alignment and possible
optical short circuits .
Figure 3-10. Positioning of corner mirrors
45°< A < 120°
A