21
95-8517
RESPONSE CHARACTERISTICS IN THE PRESENCE OF FALSE ALARM SOURCES:
False Alarm Source
Distance
Fire Source
Distance
Average Response Time
(feet)
(feet)
(seconds)
Sunlight, direct, modulated, reflected
—
6-inch propane
6
< 4
Vibration
N/A
6-inch propane
6
< 10
Radio frequency interference
1
6-inch propane
12
< 1
Arc welding
40
1 x 1 foot gasoline
40
3.1
6 kw heater, modulated
100
1 x 1 foot gasoline
100
1.9
6 kw heater, unmodulated
10
1 x 1 foot gasoline
100
5.3
250 w vapor lamp, modulated
3
1 x 1 foot gasoline
100
2.7
300 w incandescent lamp, modulated
3
1 x 1 foot gasoline
100
3.6
500 w unshielded quartz halogen lamp, modulated
8
1 x 1 foot gasoline
100
2.7
1500 w electric radiant heater, modulated
10
1 x 1 foot gasoline
100
4.2
Two 34 w fluorescent lamps, modulated
3
1 x 1 foot gasoline
100
1.7
Very High Sensitivity
False Alarm Source
Distance
Fire Source
Distance
Average Response Time
(feet)
(feet)
(seconds)
Sunlight, direct, modulated, reflected
—
6-inch propane
6
< 4
Vibration*
N/A
N/A
N/A
N/A
Radio frequency interference
1
6-inch propane
6
< 1
Arc welding
10
1 x 1 foot gasoline
10
0.2
6 kw heater, modulated
100
1 x 1 foot gasoline
100
5.0
6 kw heater, unmodulated
10
1 x 1 foot gasoline
100
10.7
250 w vapor lamp, modulated
3
1 x 1 foot gasoline
100
7.1
300 w incandescent lamp, modulated
3
1 x 1 foot gasoline
100
9.6
500 w unshielded quartz halogen lamp, modulated
8
1 x 1 foot gasoline
100
6.3
1500 w electric radiant heater, modulated
10
1 x 1 foot gasoline
90
6.4
Two 34 w fluorescent lamps, modulated
3
1 x 1 foot gasoline
100
4.6
Medium Sensitivity
* Fire was verified with very high sensitivity only.
