Rockwell Automation 2755 AdaptaScan Bar Code Readers - Manual (Page 30)

Installation Considerations 2–4
The usable beam width depends on the Reader type, the scan angle
and the distance from the bar code symbol. Make sure that the scan
beam is wide enough for the area you are scanning. Increasing the
scan angle setting (using configuration software) or moving the
Reader away from the symbol increases the beam width.
The usable beam width is approximately 80% of the total beam
width. The end 10% on either side of the scan beam cannot decode
bar code symbols.
Total Beam Width
Usable Beam Width
The following charts show the usable beam width for the default
scan angle settings. We recommend that you use the default setting
to determine the position of the Reader. This allows you to increase
or decrease the scan angle after installation.
Maximum Usable Beam Width (Catalog No. 2755-SN3) ➀
70 inches (1.78 meter)
65 inches (1.65 meter)
60 inches (1.52 meter)
55 inches (1.40 meter)
45 inches (1.14 meter)
50 inches (1.27 meter)
40 inches (1.02 meter)
25 inches (.64 meter)
35 inches (.89 meter)
30 inches (.76 meter)
20 inches (.51 meter)
15 inches (.38 meter)
10 inches (.25 meter)
77.6 inches (1.97 meter)
72.1 inches (1.83 meter)
66.5 inches (1.69 meter)
61.0 inches (1.55 meter)
49.9 inches (1.27 meter)
55.4 inches (1.41 meter)
44.3 inches (1.12 meter)
27.7 inches (.70 meter)
38.8 inches (.98 meter)
33.2 inches (.84 meter)
22.2 inches (.56 meter)
16.6 inches (.42 meter)
11.1 inches (.28 meter)
At This Distance: Usable Beam Width Is:
Scan Angle = 72 _
58 _ = Default
➀ Contact your Allen-Bradley representative for availability.
Usable Beam Width