Specifications
Leuze
electronic
20
BCL 40
Leuze electronic
4.5
Optical Data
The range at which the bar code can be read by the BCL 40 (the so-called reading field)
depends not only on the quality of the printed bar code but also on its dimensions and the
incident angle of the scanner beam.
Therefore, above all, the module of a bar code is decisive for the size of the reading field.
Figure 4.3:
The most important characteristics of a bar code
Notice!
A rule of thumb: The smaller the module of the bar code is, the smaller the maximum reading
distance and reading field width will be.
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Therefore, when selecting a mounting location and/or the bar code label, take into
account the different reading characteristics of the scanner with various bar code
modules.
For different reading tasks, the BCL 40 is available in various versions, both as a raster
scanner and as a single line scanner. The device specifications are given in the following
table and accompanying graphic.
M = Module: The narrowest line or space of a
bar code in mm
ZB = Wide elements: Wide lines and spaces are
a multiple (ratio) of the module
Module x Ratio = ZB (Normal Ratio 1:2.5)
BZ = Quiet zone: The quiet zone should be at
least 10 times the module, but not less than
2.5 mm.
L =
Code length: The length of the bar code in
mm including the start and stop characters.
The quiet zone is included depending on
the code definition.
SL = Element length: Height of the elements
in mm
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