2. Safety Information
2.5 High Brightness precautio ns: Hazard Distance (HD)
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy per surface
unit becom es lower than the applicable exposure limit on the cornea or on the skin. The light beam is considered (to
be) unsafe for exposure if the distance from a person to the light source is less than the HD .
Restriction Zone (RZ) based on the HD
The HD depends on the amount of lume ns p roduced by the projector and the type of lens installed. See next ch apter"HD in function
of m odifying optics", page 14.
To protect untrained end users (as cinema visitors, sp ectators) the installation shall comply with the following installation require-
ments: O perators s hall control ac cess to the beam within the haz ard distance or install the pro duct at the h eight that will prevent
spectators’ eyes from being in th e hazard distance. Radiation levels in excess of the limits will not be per mitted at any point less than
2.0 m eter (SH) above any surface upon which persons other than operators, performers, or em ployees are permitted to stand or less
than 1.0 meter (SW) lateral separation from any place where such persons are permitted to be. In en vironments w here unrestrained
behavior is reasonably foreseeable, the minimum s eparation height s hould be greater than or equal to 3.0 m eter to prevent potential
exposure, for example by an individual sitting on another individual’s shoulders, within the H D.
These values are minimum values and are b ased on the guidance provided in IEC 62471-5:2015 section 6.6.3.5.
The installer and user must understand the risk and apply protective meas ures based upon the haz ard distance as indicated on
the label and in the user information. Installation method, separation height, barriers, detection system or other applicable control
measure shall p revent hazardous eye access to the radiation within the hazard distance.
For example, projectors that have a HD greater than 1 m and emit light
into an un controlled area where persons m ay be present
should be positioned in accordance with “the fixed projector installation” param eters, resulting in a HD that does not extend into
the audienc e area unless the beam is at least 2.0 meter abov e the floor level. In environments where unrestrained behavior is
reasonably foreseeable, the minimum s eparation height shou
ld be greater than or equal to 3.0 meter to prevent p otential exposure,
for exam ple by an individual sitting on another individual’s s houlders, within the HD. Sufficiently large separation height may be
achieved by m ounting the image projector on the ceiling or through the use of physical barriers.
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 (boot area of projector).
PR Projector.
TH Theater.
RZ Restriction Zone in the theater.
SH Separation Height.
SW Separ atio n Width.
Based on national requirements, no per son is allowed to enter the projected beam within the zone between the p rojection lens and
the related h azard distance (HD). This shall be physically impossible by creating sufficient separation height or b y placing barriers.
The minimum separation height takes into account the surface upon which persons other than operator, per formers or employees
are permitted to stand.
On image 2-2 a typical setup is displayed. It must be verified if these m inimum requirements are met. If required a restricted z one
(RZ) in the theater must b e established. This c an be do ne by using physical barrier, like a red rope as illustrated in image 2-2.
The restricted a rea s ticker can be replaced by a sticker with only the symbol.
R5906787 THOR 26/01/2018
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