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Designed to adapt to changing environments and protect against unwanted false alarms, the response
characteristics of each
detector is set to comply with the stringent requirements of UL and NFPA 72.
Each detector is continuously monitored and tested for proper sensitivity and operation. If a problem is detected
with either the device’s sensitivity or its operation, a trouble or maintenance signal is reported back to the fire alarm
control panel.
Detectors will compensate for any sensitivity drift of the initial programmed response/sensitivity value due to
environmental contamination and/or dust buildup. Each detector maintains its initially set sensitivity at a constant
level even when the chamber is severely contaminated. When compensation levels exceed normal values, a
maintenance signal (dirty detector) signal is generated.
The intelligent detector is capable of being field programmed for one of five response/sensitivity modes (
see below
).
Response modes correspond to unique response behaviors of a detector and the type of environment it is
protecting, which can be broadly related to the characteristics of a fire. The detector response modes relate to
different combinations of smoke sensitivity characteristics and programmable assessment times. Response mode
1 is more sensitive than response mode 5. Detectors set to response mode 1 would be more suitable for
environments in which sources of unwanted alarms are rare (i.e.: clean rooms and computer rooms). Response
mode 5 set detectors would be suitable for more dusty or harsh environments (i.e.: boiler rooms, loading dock
areas). Response mode 3 (default programmed) would be the mid-sensitivity level used for most normal
applications. Response mode setting and hysteresis of the individual detectors are stored within the detector’s
memory. The storing of this critical information in the detector rather in the fire alarm control panel software allows
the detector to maintain its programmed response settings and compensated values even when power is removed
from the detector. If the detector is powered down or inadvertently placed in another location, the detector response
mode and clean values are not lost.
Clean Room,
Computer
Room
Hotel Room,
Apartment
Office,
Hospital Ward,
Factory,
Light Industry
Warehouse,
Restaurant
Loading Dock,
Parking Garage
Kitchen, Laundry
(enclosed and
ventilated)
Boiler Room
Mode
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
Photoelectric
Ionization
Multi-Sensor
Heat
1, 2, 3, 4, 5 = Response/Sensitivity Modes
= Mode Suitable for Installation
Photoelectric Detector
Multi-Sensor Detector
Response
Mode
Sensitivity
Characteristics
Programmable
Assessment
Time
Response
Mode
Smoke Sensitivity
Characteristics
Temperature
Sensitivity
Programmable
Assessment
Time
1
1.7 %/ft
5 sec
1
1.7 %/ft
High
0-20 sec
2
1.7 %/ft
30 sec
2
2.3 %/ft
None
0-30 sec
3 2.3
%/ft 5
sec
3
2.7 %/ft
Medium
0-20 sec
4 2.3
%/ft 30
sec
4
3.3 %/ft
Medium
0-20 sec
5 2.9
%/ft 5
sec
5
None
135
0
F 0-30
sec
