2. Safety
2.4 Light beam Hazard Distance (HD)
HD
Light beam Hazard Distance (HD) is the distance from the source at which the intensity or the ene rgy per surface unit
becomes lower than the applicable safety limit. The light beam can thus be considered as dangerous if the operator
is closer from the s ource than the HD.
Restriction Zone (RZ) ba sed on the HD
The HD i s defined from the projection lens surface towards the position of the lowest projected beam where the irradiance eq uals
the applicable safety limit. The H D depends on the amo unt of lumens produced by the projector and the type of lens installed. See
next chapter HD in function of the lens Throw Ra tio (TR).
To protect untrained users the installation shall comply with the following installation requirements: light output levels in excess of the
limits sh all not be perm itted at any point less than 2.0 meters (S H image 2-1) above any surface upon which persons are assum ed
to stand or 1 meter (S W image 2-1 ) below or in lateral separation from any place where such persons are assumed to be. See
image 2-1.
RA
TH
PR
RZ
HD
SW
1m
SW
SW
SW
HD
SH
RA TH
RZ
SH
(B) TOP VIEW(A) SIDE VIEW
Image 2-1
ASideview.
B Top view.
RA Restricted Access location (booth area of projector).
PR Projector.
TH Theater.
RZ Restriction Zone in the theater.
SH Separation H eight. Must be minimum 2 meter.
SW S eparation W idth. Must be minimum 1 meter.
Based on national requirements, no per son is allowed to enter the projected beam within the zone between the projection lens and
the related hazard distance (HD). T his shall be physically impossible by c reating sufficient separation height or b y placing barriers.
The minim um separation height takes into account the surface upon which persons are as sum ed to stand.
On im age 2-1 a typical setup is displayed. It must be v erified by the installer if t hese minimum requirements are met. If required a
restricted zone (RZ) in the theater m ust be established. This can b e done by using physical barrier, like a red rope a s illustrated in
image 2-2.
R5906693 DP2K-E SERIES 19/06/2015
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