Tyco FlameVision FV300 SERIES - Page 25

SYSTEM DESIGN INFORMATION
24
4.6 DIRECTIONAL SENSITIVITY
The FV300 FlameVision detector has been designed to achieve constant sensitivity across the field
of view. The relative variation of range with angle of incidence (polar diagrams) is shown in Figs.
19 and 20 for open-air tests using 0.1m
2
pan petrol fires.
The continuous line indicates response of the detector within 30 seconds (as required by both
FMRC 3260 and EN 54-10), with the detector at the minimum alarm delay. The dotted line
indicates response of the detector within 12 seconds, for the minimum alarm delay.
Note: When test fires are carried out outdoors, the response of the detector can be
significantly affected by wind as the flame may be blown horizontally outside its
field of view, at least during part of the test. In effect, the detector is seeing only
a portion of the total radiant energy from the fire during a given period. This effect
is accentuated, as the fire gets closer to the 45° position.
DETECTOR
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
0.20
0.40
0.60
0.80
1
45
o
45
o
Fig. 19 Relative Range vs Angle of Incidence - Horizontal Plane
DETECTOR
45
40
30
15
15
o
o
o
o
o
30
o
0.20
0.40
0.60
0.80
1
45
o
40
o
0
o
Fig. 20 Relative Range vs Angle of Incidence - Vertical Plane
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