Bosch D296 User Manual

 

Fire Alarm Systems | D296 24 V Projected Beam Smoke Detector

D296 24 V Projected Beam Smoke Detector

 

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Operates over distances between 30 ft (9 m) and
350 ft (107 m)

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Six levels of switch-selectable sensitivity

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Built-in alignment sights and tamper protection

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Automatic range adjustment, signal synchronization,
and contamination adjustment

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Remote indicator plate annunciates detector status
and provides test points for voltage monitoring

The D296 24 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
D296, 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 mm

2

] wire). The indicator plate has three LEDs

to indicate normal, trouble, and alarm conditions, and
test points to monitor the detector circuit.

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.

For fine tuning which requires a measurable voltage at
the receiver, the covers must be off and transmission
is necessary.

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.

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 or
the signal gains 20%, 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.