Cut Sheet

Alignment Tip
When using a small retroreflective target at medium or long range, temporarily attach (or suspend) a strip of
retroreflective tape (e.g., BRT-THG-2) along a line which intersects the actual target. The visible red laser beam is easily
seen in normal room lighting. Sight along the beam toward the target (from behind the sensor). Move the sensor to scan
the laser beam back and forth across the retro tape strip. Use the tape strip to guide the beam onto the target.
Consider the use of Banner sensor mounting bracket SMB30SC. This swivel bracket can simplify multiple-axis alignment.
Alignment is complete when the visible image is centered on the retro target. The perpendicularity of the laser beam to the
face of the retro target is forgiving, just as it is with a conventional retroreflective sensor.
Effective Beam Size
Unlike conventional retroreflective sensors, the retroreflective laser has the ability to sense relatively small profiles. Table
2 on page 3 indicates the diameter of the smallest opaque rod which will reliably break the laser beam at several
sensor-to-object distances. These figures assume an excess gain of about 10 times. Flooding effects are possible when the
gain is much higher. This means that sensor gain may have to be reduced in some situations in order to reliably detect
these minimum object sizes.
Note that the shape of the beam is elliptical. The minimum object sizes listed assume passage of the rod across the major
diameter of the ellipse (worst case). It may be possible to detect objects smaller than the sizes listed if the direction in
which the objects pass through the beam can be controlled.
Table 2: Minimum Object Detection Size vs. Distance from Sensor
Distance from Sensor to Object
Minimum Object Detection Size
0.3 m (1 feet) 2.5 mm (0.10 inches)
1.5 m (5 feet) 3.0 mm (0.12 inches)
3 m (10 feet) 4.5 mm (0.18 inches)
15 m (50 feet) 19 mm (0.75 inches)
30 m (100 feet) 25 mm (1.0 inches)
Wiring Diagrams
Cabled Models
bn
wh
bu
+
–
bk
Load
Load
10-30V dc
Beam Inhibit: Connect to +V
ye
Mini- or Euro-Style Quick-Disconnect Models
bn
wh
bu
+
–
bk
ye or gy
Load
Load
10-30V dc
Beam Inhibit: Connect to +V
Q45BB6LL Laser Diode Retroreflective Sensors
P/N 38244 Rev. C www.bannerengineering.com - Tel: [phone]