EYES AND SKIN RISKS
USER MANUAL
111
Accidental vision of the reflected laser radiation
Assuming a direct exposure of 10 seconds at a nominal distance of 0.5 m (worst case
considered), with the Arex™ 400 model using F-Theta scan lens 160 mm, it is possible to
calculate the suitable optical density (O.D.) for safety goggles.
The O.D. (Optical Density) in last column assures the reduction of laser radiation below
max acceptable exposure.
O.D.=
log (H/EMP) where EMP is the Maximum Permissible Exposure and H is the radi-
ant exposure.
18.8 m
> 4.74
26.5 m
> 4.04
31.6 m
> 4.19
40.8 m
> 4.41
52.5 m
> 4.51
Filter scale index of the protection goggles
The scale index L of the filters indicates the stability against radiation, which means the
ability of the filter to maintain its characteristics unchanged.
This stability is certified by goggles producer according to the UNI EN 207.
It is then necessary to verify that the scale index of the adopted filter is stable for this
period and to consider an adequate overrating in order to make sure that it could last
longer than the accidental exposure period.
In case of exposure at 0.5 m for 10 seconds, the suggested optical density for safety gog-
gles is CLASS
L4
.
EYES AND SKIN RISKS
If exposed to intense Laser radiation, even of a short duration, or a less intense but lon-
ger lasting duration, both the Cornea and the Retina can burn and be damaged irrepara-
bly. This is particularly critical for Class 4 laser beam.
If subject to direct focalized radiation, even the skin can burn.
GENERAL SAFETY REGULATIONS
The user of the laser marker must comply with all regulations and work best practices
regarding safety. Therefore it is necessary to develop a Standard Operating Procedure
(S.O.P.) related to operations of the machine incorporating this laser marker. This proce-
dure, shall be available at time of installation, shall serve as a reference for the Operator
and shall be written in his/her language.
Training is essential and must include:
•
Familiarization with system operating procedures.
•
Knowledge of the biological effects of radiation on the Eyes and Skin.
•
Understanding of the necessity for Individual Protection Devices (I.P.D.)
SOURCE
N.O.H.D.
(NOMINAL OCULAR
HAZARD DISTANCE)
O.D.
(OPTICAL DENSITY)
Arex™ 110-XXX
Arex™ 120-XXX
Arex™ 130-X6X
Arex™ 150-X6X
Arex™ A20-X6X
