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BIS U Basic Manual
2
Safety Distances to the Antenna
6
The following measures can be taken to comply with the occupational safety regulation:
–
Organizational measures that require creating operating instructions containing relevant
information to ensure safe operation and that draw attention to the possibility of exposure to
electromagnetic fields.
–
Securing the antennas by mounting protective equipment or setting up cordons to make sure
people cannot be too close to the antenna during operation.
An inspection should always be carried out at appropriate time intervals before and after the task
is performed.
According to what is currently known, being in the vicinity of antennas for a brief time does not
pose a health risk. Under certain circumstances during operation, the reader and antenna may
interfere with pacemakers if the pacemaker wearer is within range of the antenna. If in doubt, the
person involved should contact the pacemaker manufacturer or their doctor.
The following figure shows the field intensity curve in close proximity to an antenna and the limit
values of the electric field strength with the EU directive as an example.
100
90
80
70
60
50
40
30
20
10
0
0
20
Figure 1:
Electric field in close proximity to the antenna for 2 watts
polarized antenna are taken into consideration
Exposure range 1 BGR B11
EU Directive 2004-40 Employ.
Exposure range 2 BGR B11 26.
BlmSchV
EU Directive 1999-519 Pop.
Field intensity curve
40
60
80
Distance to the antenna in cm
. Both components of the circular
ERP
100
120
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