Bosch D296 Installation Manual page 11

Long-range beam smoke detectors
Figure 3.2: Smoke Densty and Obscuration Graph
Determine the total obscuration needed for an alarm and select the sensitivity setting needed
according to the following table.
Total Obscuration at Alarm
20%
30%
40%
50%
60%
70%
The D296 and D297 can be set for quick response (5 sec) or normal response (30 sec). Some
burning materials release hazardous gases along with the smoke. Set the sensitivity for a
shorter response times to minimize exposure to the dangerous vapors. Denser smokes
allowed to collect for too long, can produce near total obscuration of the detector. This
Bosch Security Systems, Inc.
1 Smoke density
2 UL minimum sensitivity
3 UL maximum sensitiivity
4 Distance between transmitter and
Sensitivity Switch Setting
2
0 or 3
4
5
1 or 6
7
Installation manual
Installation considerations | en
receiver
2017.03 | 7.0 | F.01U.068.899
11