Bosch 1943 LED Specifikace stáhnout pdf (Strana 2)

Bosch Security Systems, Inc. | 09/06 | 31344F2

D296/D297 | Installation Instructions |

FCC Compliance Notice

This equipment was tested and complies with the limits

for a Class B Digital Device, pursuant to Part 15 of the

Federal Communications Commission (FCC) rules.

These limits provide reasonable protection against

harmful interference in a residential installation.

This equipment generates, uses, and can radiate radio

frequency energy. If not installed and used according to

the manufacturer's instructions and recommendations,

this equipment might cause harmful interference to

radio communications. There is no guarantee that

interference will not occur in a particular installation. If

this equipment does cause harmful interference to radio

or television reception, determined by turning the

equipment on and off, try correcting the interference by

doing one or more of the following:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and

the receiver.

• Connect the equipment to an outlet on a circuit

different from the receiver.

• Contact the installing company or an experienced

radio or TV technician for help.

The FCC booklet How to Identify and Resolve Radio-TV

Interference Problems (stock number 004-000-00345-4)

can be helpful. It is available from:

U. S. Government Printing Office

Washington, DC 20402

1.0 Description

The D296 and D297 Long-Range Beam Smoke

Detectors have a separate transmitter and receiver.

Internal pointability provides coverage flexibility

without brackets. Automatic signal synchronization and

range adjustment reduce installation costs. Selectable

sensitivity and alarm response time provide installation

flexibility.

2.0 Operation

Each D296 and D297 Transmitter sends an invisible

infrared beam of a specific frequency and intensity. Each

D296 and D297 Receiver detects and measures the

beam’s intensity (refer to Figure 1).

As smoke obscures the beam, the receiver senses a

decrease in the signal strength and measures that

decrease. The receiver compares the signal level with

two preset thresholds: an alarm threshold that is set

using the sensitivity switch and a trouble threshold that

is preset at approximately 10%. If the signal falls below

the alarm threshold for the programmed alarm period,

the receiver signals an alarm (refer to Figure 2).

If the signal falls below the trouble threshold for more

than 20 sec (caused by an object blocking the beam for

example), the receiver signals a trouble condition (refer

to Figure 3).

1 - Transmitter 3 - Obscuring object

2 - Beam 4 - Receiver

Figure 2: Beam Obscuration

1 - Transmitter 3 - Blocking object

2 - Beam 4 - Receiver

Figure 3: Beam Blockage

1 3

1 - Transmitter 2 - Beam 3 - Receiver

Figure 1: Infrared Transmission

1.0 Description

1 2 3 4 5 6 7 ... 15 16

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