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11Bosch Security Systems, Inc. | 09/06 | 31344F

7.7 Field Sensitivity Measurements

The D296 and D297 automatically compensate for the

effects of dust and dirt accumulation on their covers.

They also compensate for component aging. The NFPA

requires the detector sensitivity be measured in the field

within one year after its initial installation and every

alternate year thereafter (refer to NFPA 72).

Order a D308 Test Kit to test detector sensitivity in the

field. Refer to Table 5 for alarm information for the

D308 filters and the Sensitivity Test Kit provided with

the detectors.

Table 5: Sensitivity and Response

Sensitivity Setting Must Not Alarm Must Alarm

2 0% (no filter) 40% filter

0 or 3 0% (no filter) 60% filter

4 20% (filter) 60% filter

5 20% (filter) 80% filter

1 or 6 40% (filter) 80% filter

7 40% (filter) 80% filter

Use the Sensitivity Test Kit to check detector sensitivity

only during installation. For field testing, use the D308.

Each filter decreases the detector’s signal by a specific

amount. When you place a filter in front of the receiver’s

optical module for a minimum of 30 sec

(5 sec for position 0 or 1), you can determine the

approximate sensitivity setting of the installed detector

by its response as shown in Table 5.

Testing these detectors activates a Fire

alarm. Inform all concerned personnel

before performing a test.

D296/D297 | Installation Instructions | 7.0 Additional Information

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Bosch 1943 LED Specifiche Pagina 11