Field Sensitivity Measurements - Bosch D296 Installation Instructions Manual

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
2 0% (no filter)
0 or 3 0% (no filter)
4 20% (filter)
5 20% (filter)
1 or 6 40% (filter)
7 40% (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.
Bosch Security Systems, Inc. | 09/06 | 31344F
D296/D297 | Installation Instructions | 7.0
Must Alarm
40% filter
60% filter
60% filter
80% filter
80% filter
80% filter
Additional Information
11