Document Introduction; Detector System Introduction - Bosch D296 Application Manual
Projected-beam smoke detectors
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Also See for D296:
- Installation manual (32 pages) ,
- Installation instructions manual (28 pages) ,
- Application manual (12 pages)
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en | Document Introduction
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Document Introduction
Trademarks
All hardware and software product names used in this document are likely to be registered
trademarks and must be treated accordingly.
NFPA, NFPA 72, National Fire Protection Association, and National Fire Alarm and Signaling
Code are registered trademarks of the National Fire Alarm Association, Inc. in the United
States.
National Fire Alarm and Signaling Code
When planning and before installing a fire protection system, ensure that you are familiar with
the requirements of the current edition of NFPA 72 (The National Fire Alarm and Signaling
Code), section 17.7.3.7 Projected Beam-Type Smoke Detectors and relevant sections of
Annex A and Annex B of the code.
Notice
Notice!
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Before installing any fire alarm system, consult your local authority having jurisdiction (AHJ).
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Detector System Introduction
Notice!
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Use this document to determine the best locations and applications of the D296/D297 Projec-
ted Beam Smoke Detectors .
Use the D296/D297 detectors:
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The detectors have separate transmitters and receivers . The transmitter projects an infrared
(IR) beam across the protected area to a receiver containing a photosensitive cell that
monitors the signal strength of the light beam.
The D296/D297 detectors work on the principle of obscuring light. The detector's
photosensitive element in the receiver sees light produced by the transmitter in a normal
condition. The receiver is calibrated to a preset sensitivity level based on a percentage of total
obscuration . Beam length and the desired response time determine this sensitivity level. The
installer can choose from eight sensitivity settings based on the length of the beam used in a
particular application.
The transmitter and receiver can be independently powered, greatly reducing wiring runs and
installation cost. Since battery backup is required for fire alarm systems, battery backup is
required for the transmitter whether it is powered from the control panel or is independently
powered.
2013.02 | 02 | F.01U.500.951
Where there are high ceilings such as in atriums and aircraft hangers. Mount the
detectors on walls for easy access.
In dusty environments such as warehouses, factories, and barns. These detectors have
built-in compensation to prevent alarms caused by dust.
Where there are expansive ceilings. One set of D296/D297 detectors can replace up to 24
spot‑type detectors. This saves on service and installation costs, especially in areas such
as large offices or department stores.
On ornamental ceilings where spot‑type detectors are a distraction.
Where there is limited access to the ceiling such as in factories and warehouses.
Application Guide
Projected-beam Smoke Detectors
Bosch Security System, Inc.
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