Technical data
Leuze electronic GmbH + Co. KG
BCL 358
i
39
Figure 5.6: Dimensioned drawing of MK 3xx terminal hood
5.4
Reading field curves / optical data
5.4.1 Bar code characteristics
Figure 5.7: The most important characteristics of a bar code
The range in which the bar code can be read by the BCL 358
i
(the so-called reading field) depends on the
quality of the printed bar code and its dimensions.
Therefore, above all, the module of a bar code is decisive for the size of the reading field.
ATTENTION!
To ensure degree of protection IP 65 is fulfilled, the screws of the connection hood are
tightened with a tightening torque of 1.4 Nm for connecting to the BCL.
MK 3xx
terminal hood
NOTE
Please note that the size of the bar code module influences the maximum reading distance and
the width of the reading field. 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.
M
= Module: The narrowest line or space of a bar code in mm
Z
B
= Wide character: Wide bars and gaps are a multiple (ratio) of the module.
Module x Ratio = Z
B
(Normal Ratio 1 : 2.5)
B
Z
= Quiet zone: The quiet zone should be at least 10 times the module, but not less than 2.5mm.
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.
S
L
= Bar length: height of the elements in mm
