Installation and mounting
Leuze electronic GmbH + Co. KG
BCL 358
i
54
6.3
Device arrangement
6.3.1 Selecting a mounting location
In order to select the right mounting location, several factors must be considered:
• Size, orientation, and position tolerance of the bar codes on the objects to be scanned.
• The reading field of the BCL 358
i
in relation to the bar code module width.
• The resulting minimum and maximum reading distance from the respective reading field (see
chapter 5.4 "Reading field curves / optical data").
• The permissible cable lengths between the BCL 358
i
and the host system depending on which inter
-
face is used.
• The correct time for data output. The BCL 358
i
should be positioned in such a way that, taking into
consideration the time required for data processing and the conveyor belt speed, there is sufficient
time to e.g. initiate sorting operations on the basis of the read data.
• The display elements such as LEDs or the display should be highly visible.
• For configuring and commissioning with the webConfig tool, the USB interface should be easily
accessible.
For specific information, please refer to Chapter 6 and Chapter 7.
6.3.2 Avoiding total reflection – Line scanner
The bar code label must be positioned at an angle of inclination greater than ±10° … 15° from vertical in
order to avoid total reflection of the laser beam (see Figure 6.7)!
Total reflection occurs whenever the laser light of the bar code reader is directly incident on the surface of
the bar code at an angle of 90°. The light directly reflected by the bar code may overload the bar code
reader and thereby cause non-readings!
Figure 6.7: Total reflection – line scanner
NOTE
The beam of the BCL 358
i
exits:
• Parallel to the housing base in the case of the line scanner
• At 105 degrees from the housing base in the case of the deflecting mirror
• Perpendicular to the housing base in the case of the oscillating mirror
In each case, the housing base is the black area in Figure 6.2. The best read results are obtained
when:
• The BCL 358
i
is mounted in such a way that the scanning beam is incident on the bar code
at an angle of inclination greater than ±10° … 15° to vertical.
• The reading distance lies in the middle area of the reading field.
• The bar code labels are of good print quality and have good contrast ratios.
• You do not use high-gloss labels.
• There is no direct sunlight.
Zero p
osition
Distan
ce acc
. to re
ading
field
curve
s
Bar code
The BCL 358
i
should be mounted in such a
way that the scanning beam is incident on the
bar code at an angle of inclination greater than
±10° … 15° to vertical.
±10 … 15°