Bosch D297 Specsheet
Fire Alarm Systems | D297 12 V Projected Beam Smoke Detector
D297 12 V Projected Beam Smoke Detector
www.boschsecurity.com
u Operates over distances between 30 ft (9 m) and
350 ft (107 m)
u Six levels of switch-selectable sensitivity
u Built-in alignment sights and tamper protection
The D297 12 V Projected Beam Smoke Detector is
used in clear open structures such as arenas, atriums,
auditoriums, ballrooms, churches, factories, museums,
and warehouses. Each detector consists of a
transmitter, a receiver, and a remote indicator plate.
Because the transmitter and receiver typically mount
on the ceiling or high on walls or columns, they
provide an effective and unobtrusive means of
supervising public areas for fire protection.
The D306 Remote Indicator Plate, included with the
D297, provides a convenient means of verifying
detector status. Install it anywhere within 500 ft
(152 m) of the beam receiver (when using 18 AWG
[0.75 mm2] wire). The indicator plate has three LEDs
to indicate normal, trouble, and alarm conditions, and
test points to monitor the detector circuit.
Functions
Aim Mode
When the cover is removed from the receiver, the
receiver goes into aim mode. When the cover is
removed from the transmitter, the transmitter stops
transmitting. Pressing the Aim Mode button on the
transmitter allows transmission while the cover is off.
u Automatic range adjustment, signal synchronization,
and contamination adjustment
u Remote indicator plate annunciates detector status
and provides test points for voltage monitoring
For fine tuning which requires a measurable voltage at
the receiver, the covers must be off and transmission
is necessary.
Alarm Operation
The transmitter emits a pulsed infrared beam. The
receiver measures the intensity of the beam over a
period of time and compares this data with an alarm
threshold. Select one of six levels of sensitivity for the
alarm threshold through a switch on the receiver.
If the receiver senses signal strength below the preset
alarm threshold in excess of the alarm period it signals
an alarm.
Signal Loss Compensation
The receiver automatically compensates for the
gradual loss of signal due to dust and dirt build-up on
the cover. The receiver measures the intensity of the
pulsed infrared beam emitted by the transmitter over a
period of time and compares this data with a preset
trouble threshold. When 50% of the signal is lost, the
receiver sends a trouble signal to the control panel.
When the dust and dirt build-up is cleaned or the
blockage is removed, the detector automatically
resets.
2 | D297 12 V Projected Beam Smoke Detector
Tamper Detection
If the covers to the transmitter or receiver are
removed, the detector sends a trouble signal to the
control panel.
Trouble Detection
The receiver measures the intensity of the pulsed
infrared beam emitted by the transmitter over a period
of time and compares this data with a preset trouble
threshold. When 90% or more of the signal is lost for
more than 20 seconds, as might happen if an object
blocked the beam, the receiver sends a trouble signal
to the control panel.
Certifications and approvals
Region Certification
USA UL UROX: Smoke - Automatic Fire Detectors
(UL268 and A), UROX7: Smoke - Automatic Fire Detectors Certified for Canada (ULC529)
FM D297
CSFM see our website
Hong Kong HKFSD J-005/C/024
Installation/configuration notes
Mounting Considerations
The transmitter and receiver mount on standard
3.5‑inch or 4‑inch square or octagonal back boxes or
European Beza boxes. The indicator plate mounts on a
standard single-gang back box.
The distance between the transmitter and receiver can
range from 30 ft (9 m) to 350 ft (107 m). When using
18 AWG (ISO 0.75 mm2) wire within conduit, the
indicator plate must be within 500 ft (152 m) of the
receiver.
Mount the detectors directly to the ceiling or to side
walls. Do not mount the units so that the beam runs
closer than 4 in. (10.2 cm) to the intersection of the
wall and the ceiling. Otherwise, place and space the
detectors according to NFPA 72.
Parts included
Quant. Component
1 D297 Transmitter
1 D297 Receiver
1 D306 Remote Indicator Plate with 3 ft (1 m) cable
1 D1005 Test Cable
1 Hardware Pack
1 Literature Pack
Technical specifications
Electrical
D297
Current (alarm): Receiver: 75 mA. Transmitter: 20 mA
Current (standby): Receiver: 50 mA, Transmitter: 20 mA
Voltage (operating): 10.2 VDC to 15 VDC
D306 and D307
Current (alarm): 15 mA at 24 VDC
Current (standby): 5 mA at 24 VDC
Voltage (operating): 10 VDC to 32 VDC
Environmental
Relative Humidity: 0% to 95%, non-condensing
Temperature (ambient): -22°F to +130°F (-30°C to +54°C)
For UL Listed installations, +32°F to
+100°F (0°C to +38°C)
Mechanical
Enclosure Design
Dimensions (H x W x D): 7 in. x 5.5 in. x 5.5 in. (17.8 cm x 14 cm x
14 cm)
Transmission Range: 30 ft (9 m) to 350 ft (107 m)
Notice
The beam path should be clear of moving objects.
Avoid areas subject to normal smoke
concentrations such as kitchens and garages. Do
not install units where normal ambient
temperatures are below -22°F (-30°C) or above
+130°F (+54°C).
Lateral Spacing between Systems
For adequate coverage, the lateral spacing between
adjacent detector systems must not exceed 60 ft
(18 m).
Wiring
System wire terminals accept 18 AWG to 12 AWG (ISO
0.75 mm2 to 4 mm2) solid wires.
Ordering information
D297 12 V Projected Beam Smoke Detector
The D297 (12 V) provides an effective and unobtrusive
means of supervising public areas for fire protection. It
consists of a transmitter and a receiver that typically
mount on the ceiling or high on walls or columns and a
remote annunciation plate that mounts at eye level.
Order number D297
Accessories
D306 Remote Indicator Plate
Used with the D296/D297 Long-Range Beam Smoke
Detectors and the D340 Series Duct Smoke Detector
Housings
Order number D306
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