Field Sensitivity Measurements - Bosch D296 Installation Manual

28 en | Maintenance and Testing
3.
4.
Notice!
You can also use the voltage monitor to check the sensitivity level of the detector. As the
signal level decreases because of dust or dirt buildup on the lenses or system misalignment,
the voltage reading also decreases.
8.6

Field sensitivity measurements

Notice!
Testing these detectors activates a fire alarm. Inform all concerned personnel before
performing a test.
The detectors automatically compensate for the effects of dust and dirt accumulation on their
covers. They also compensate for component aging.
Notice!
NFPA 72 requires the detector sensitivity be measured in the field within one year after initial
installation and every alternate year thereafter.
Use the Sensitivity Test Kit supplied with the detector to check detector sensitivity only during
installation. For field testing, order and use a D308 Test Kit.
Each filter decreases the detector's signal by a specific amount. Place a filter in front of the
receiver's optical module. Hold it there for a minimum of 30 sec. (5 sec. for position 0 or 1).
Determine the approximate sensitivity setting of the installed detector by the response as
shown in the following table.
Sensitivity Setting
2
0 or 3
4
5
1 or 6
7
Tab. 8.4: Sensitivity and Response
2017.03 | 7.0 | F.01U.068.899
The red LED lights steadily and the system sounds an alarm.
Turn the switch to RESET for a minimum of 1 sec.
The red LED turns off and the green LED lights steadily for approximately 60 sec. to 120
sec.
The receiver proceeds with Setup Mode. When the setup is completed, the green LED
begins flashing.
Connect a standard volt-ohm meter (VOM) to the voltage monitor plugs. The voltage
reading must range between 3.8 VDC and 4.2 VDC when clean and properly aimed.
Must Not Alarm
0% (no filter)
0% (no filter)
20% (filter)
20% (filter)
40% (filter)
40% (filter)
Installation manual
Long-range beam smoke detectors
Must Alarm
40% filter
60% filter
60% filter
80% filter
80% filter
80% filter
Bosch Security Systems, Inc.