Projected Beam Smoke Detectors

Brand: BOSCH

Country of Origin: GERMANY

Model: D-296

Features:

▶ 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

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.

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 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.

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.

Technical specifications

Electrical

D296

Current (alarm): Receiver: 60 mA, Transmitter: 20 mA

Current (standby): Receiver: 45 mA, Transmitter: 20 mA

Voltage (operating): 18 VDC to 32 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

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)