HEALTH & SAFETY
L025317 Issue 1 March 2011 1-9
CLASS 1 GUARDING
The following type of guarding, using the recommended materials and
construction techniques, is required to achieve a Class 1 installation.
Access Guards
Access guards are required to prevent direct human access to the laser beam.
In practice, this requires full guarding of the area between, and including, the
laser output lens and the area to be marked on the substrate.
Note: Guarding is required behind the substrate to prevent access to the laser
beam when the substrate is removed, or following accidental burn through
of the substrate.
Visor Guards
Visor guards are required to prevent the escape of scattered radiation. Often
the access guarding can be designed to perform this function without the
need of an extra guard.
Beam Stop Guard
A beam stop guard is required for applications where guarding material is
fitted within 100mm of the laser lens focal plane. The beam stop is to prevent
burn through of the guard should the laser be repeatedly operated without the
substrate in position. The beam stop must be capable of absorbing the full
output power of the laser for a period of eight hours and be large enough to
cover the complete laser marking field area.
Substrate
Laser Beam Path
Access Guard
Laser Head
Lens
Substrate
Laser Beam Path
Access/Visor Guard
Laser Head
Lens
Scattered
Radiation
Scattered
Radiation
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