SYSTEM DESIGN INFORMATION
25
4.7 FALSE ALARM IMMUNITY
The FV300 has been subjected to the following stimuli that might be considered potential sources
of false alarms. Unless otherwise specified, tests were performed at a minimum distance between
source and detector. Steady state sources were chopped at both regular and random frequencies in
the range 0 - 10Hz.
4.8 DESIGN OF SYSTEM
4.8.1 GENERAL
Using the information given in Sections 4.5 and 4.6, it is possible to design a flame detection
system having a predictable performance. Guidelines on the application of the above data, and on
siting of detectors, are given in the following paragraphs.
CAUTION:
THE GUIDELINES GIVEN HERE CANNOT CATER FOR ALL
EVENTUALITIES THAT MAY BE ENCOUNTERED ON A SITE.
FALSE ALARM SOURCE IMMUNITY DISTANCE RESPONSE (m)
1 Sunlight No response
2 Sunlight with rain No response
3 150W tungsten filament lamp 1m
4
Fluorescent lamp (bank of 4 x
32 W circular lamps)
1m
5 70W sodium lamp 1m
6 125W mercury vapour lamp 1m
7 4.8kW IR radiant heater 1m
8
2 x 500W quartz halogen lamps
(unshielded)
2m
9 2 kW fan heater 1m
10 Car headlights (60W halogen) No response
11 Car headlights (60W xenon) 4m
12 Lighted cigarette No response
13
Grinding of ducting metal
(angle grinder)
No response
14
Electric arc welding (2.5mm
rod)
4m
15 MIG welding 1m
16 Vibration N/A
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