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2–4
Installation Considerations
Usable Beam Width
At This Distance:
70 inches (1.78 meter)
65 inches (1.65 meter)
60 inches (1.52 meter)
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.
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)
55 inches (1.40 meter)
50 inches (1.27 meter)
45 inches (1.14 meter)
40 inches (1.02 meter)
35 inches (.89 meter)
30 inches (.76 meter)
25 inches (.64 meter)
20 inches (.51 meter)
15 inches (.38 meter)
10 inches (.25 meter)
Contact your Allen-Bradley representative for availability.
Usable Beam Width
Total Beam Width
49.9 inches (1.27 meter)
44.3 inches (1.12 meter)
38.8 inches (.98 meter)
33.2 inches (.84 meter)
27.7 inches (.70 meter)
22.2 inches (.56 meter)
16.6 inches (.42 meter)
11.1 inches (.28 meter)
Scan Angle = 72_
58_ = Default
Usable Beam Width Is:
77.6 inches (1.97 meter)
72.1 inches (1.83 meter)
66.5 inches (1.69 meter)
61.0 inches (1.55 meter)
55.4 inches (1.41 meter)
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