The D297 Projected Beam Smoke Detector is used in clear open structures such as arenas, atriums, auditoriums, ballrooms, churches, factories, museums, and warehouses. Each D297 detector consists of a transmitter, a receiver, and a remote annunciation 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 100 ft (30 m) of the beam receiver. The D306 has LEDs to indicate normal, trouble, and alarm conditions, and test points to monitor the detector circuit.
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 a 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.
If the covers to the transmitter or receiver are removed, the detector sends a trouble signal to the control panel.
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.
D296 Series Projected Beam Smoke Detectors
Operates over distances between 30 ft (9 m) and 350 ft (107 m)
Six levels of switch-selectable sensitivity
Built-in alignment sights and tamper protection
Automatic range adjustment, signal synchronization, and contamination adjustment
Remote indicator plate annunciates voltage, trouble, and alarm conditions
Switch-selectable alarm signal delay
Auxiliary Form C alarm relay
Certifications and Approvals
|UL UROX: Smoke – Automatic Fire Detectors (UL268)|
|CSFM 7260-1615: 132|
Factory Mutual Research
Hong Kong Fire Services Department (HKFSD)
The transmitter and receiver mount on standard 3.5-inch square or octagonal back boxes. The D306 Remote Indicator mounts on a standard single-gang back box or European Beza box.
The distance between the transmitter and receiver can range from 30 ft (9 m) to 350 ft (107 m).
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. For a sloped or peaked ceiling, the beam path should be located within 3 ft (0.9 m) of the ceiling's peak (NFPA 72).
Note The beam path should be clear of moving objects. Avoid areas subject to normal smoke concentrations such a 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).
System wire terminals accept 12 AWG (2.0 mm) to 18 AWG (1.0 mm) solid wires.
|1||D306 Remote Indicator Plate|
-22°F to +130°F (-30°C to +54°C)
For UL Listed installations, +32°F to +100°F (0°C to +38°C)
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)|
|Current (alarm):||Receiver: 75 mA. Transmitter: 20 mA|
|Current (standby):||Receiver: 50 mA, Transmitter: 20 mA|
|Voltage (operating):||10.2 VDC to 15 VDC|