Light Beam Hazard Distance (Hd) - Barco ZEUS Installation And Safety Manual

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 energy 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 source than the HD.
Restriction Zone (RZ) based on the HD
The HD is defined from the projection lens surface towards the position of the lowest projected beam where the irradiance equals
the applicable safety limit. The HD depends on the amount of lumens produced by the projector and the type of lens installed. See
next chapter HD in function of the lens Throw Ratio (TR).
To protect untrained users the installation shall comply with the following installation requirements: light output levels in excess of the
limits shall not be permitted at any point less than 2.0 meters (SH image 2-1) above any surface upon which persons are assumed
to stand or 1 meter (SW image 2-1) below or in lateral separation from any place where such persons are assumed to be. See
image 2-1.
RA TH
SH
(A) SIDE VIEW
Image 2-1
A Side view.
B Top view.
RA Restricted Access location (booth area of projector).
PR Projector.
TH Theater.
RZ Restriction Zone in the theater.
SH Separation Height. Must be minimum 2 meter.
SW Separation Width. Must be minimum 1 meter.
Based on national requirements, no person is allowed to enter the projected beam within the zone between the projection lens and
the related hazard distance (HD). This shall be physically impossible by creating sufficient separation height or by placing barriers.
The minimum separation height takes into account the surface upon which persons are assumed to stand.
On image 2-1 a typical setup is displayed. It must be verified by the installer if these minimum requirements are met. If required a
restricted zone (RZ) in the theater must be established. This can be done by using physical barrier, like a red rope as illustrated in
image 2-2.
12
RZ
SH
TH
SW
RA
PR
SW
(B) TOP VIEW
SW
RZ
SW
R5905961 ZEUS 09/03/2015