FL4000
25
Figure 13: Vertical FOV – n-Heptane – Medium
Sensitivity.
Figure 14: Vertical FOV – n-Heptane – Low
Sensitivity.
3.3.2 Optical Sensitivity Range
The distance at which the detector will respond to a flame is a function of the intensity of that
flame. The maximum distance is 210 ft (64.0 m) for an
n
-heptane fire with a surface area of
1 ft
2
(0.092 m
2
). The following table shows the specified ranges for a given sensitivity setting.
Table 6: Sensitivity Settings for n-Heptane
Sensitivity Setting
Specified Range ft (m)
Low 60
(18)
Medium 120
(37)
High 210
(64)