OSI-RI by Fire-Lite Alarms
OSI-RI-FL Installation Guide
E56-6584-001 | October 2018
23
10 Mounting Considerations for Single Ended Beam
Detectors
There must be a permanent clear line of vision between the detector and the reflector. Reflective objects must
not be near the line of vision between the detector and reflector. Reflective objects too near to the line of sight
can reflect the light beam from the transmitter to the receiver. If this occurs, the detector will not be able to
distinguish these reflections from those of the reflector and the protected space will be compromised.
Reflective objects such as ductwork or windows should be a m/- 2° out of the center of the beam
path of the beam). In cases where reflective objects cannot be avoided, the complete reflector blockage test
can be used to determine if the installation is acceptable.
For more information refer to section 13 and 15.
Light sources of extreme intensity such as sunlight and halogen lamps, if directed at the receiver, can cause a
dramatic signal change resulting in fault signals. To prevent this problem direct sunlight into the
transmitter/receiver unit should be avoided. There should be a minimum of 10° between the pathway of the
light source and detector and the line of sight between detector and reflector.
Operation of the detector through panes of glass should be avoided. Since single ended beam detectors
operate on a reflection principle, a pane of glass perpendicular to the line of sight between the detector and the
reflector can reflect the light beam from the transmitter to the receiver. If the application requires operation
through glass, use the conventional dual ended imaging smoke beam detector from the OSID family offering.
These beams will require a separate addressable module to connect to the loop.
Where high ceilings (more than 30 feet or 9.1 meters) are present additional beam smoke detectors mounted
at multiple heights may be required to detect smoke at lower levels. For more information refer to section 7.
Summary of Contents for OSI-RI-FL
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