Banner PicoDot PD Series - Manual (Page 3)

305 mm (12 inch) Focus
Models Cable Output
Type
Excess Gain Beam Width
PD49VN6C300 2 m (6.5 ft) cable NPN
1
10
100
10 mm
0.4 in.
100 mm
4 in.
1000 mm
40 in.
1 mm
0.04 in.
1000
DISTANCE
300 mm (12 in.) PicoDot
Convergent Mode
EXCESS
GAIN
375 mm
14.0 in
300 mm
12.0 in
225 mm
8.0 in
150 mm
6.0 in
75 mm
3.0 in
0
0
1 mm
2 mm
3 mm
1 mm
2 mm
3 mm
0
0.04 in
0.08 in
0.12 in
0.04 in
0.08 in
0.12 in
DISTANCE
300 mm (12 in) PicoDot
Convergent Mode PD49VN6C300Q 5-pin Euro-style QD
150 mm (6 in) pigtail
PD49VP6C300 2 m (6.5 ft) cable PNP
PD49VP6C300Q 5-pin Euro-style QD
150 mm (6 in) pigtail
Retroreflective Sensor Alignment
Because the PicoDot laser sensor has such a long sensing range, and because its beam is so narrow (compared to the
beam of typical retro sensors), its alignment is somewhat less forgiving and more difficult to accomplish. As indicated, the
effect of angular misalignment can be dramatic, especially over distance. For example, with one 51 mm (2 in) reflective
target mounted at a distance of 6 m (20 ft) from the sensor, only one degree of angular misalignment will cause the
center of the laser beam to miss the center of the target by 102 mm (4 in), and miss the target altogether by almost 76
mm (3 in).
Alignment tip: When using a small retroreflective target at medium or long range, it is often useful to temporarily attach
(or suspend) a strip of retroreflective tape (such as BRT-THG-2-100) along a line that intersects the real 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 tape strip, to guide the beam onto the target.
The use of mounting bracket SMB-46A may simplify alignment, because of its precision-positioning feature. After mounting
the bracket and the sensor, tighten the screws in the two corners of the bracket to position the beam in the exact spot
needed.
Ø = Misalignment Angle
Y = X(tan Ø)
X
Laser
Emitter
Y
Ø
Figure 1. Beam displacement per degree of misalignment
Distance (X) To Retro Target Beam Displacement (Y) for 1°
of Misalignment
1.5 m (5 ft) 25 mm (1 in)
3 m (10 ft) 50 mm (2 in)
6 m (20 ft) 100 mm (4 in)
15 m (50 ft) 250 mm (10 in)
30 m (100 ft) 500 mm (20 in)
PD49 Series Ruggedized PicoDot ®
P/N 67450 Rev. B www.bannerengineering.com - tel: 763-544-3164 3