DW1401831 Rev.K1
Sep 18, 2015
6
8.2.1
Spacing of heat detectors
Spot type heat detector spacing is based on detector installation on a flat smooth ceiling at 3 m (10 ft.) high. Spacing of
spot type detector is shown in Figure 2. The coverage area of a detector is represented as a square. Actual detector
coverage covers a circle whose radius is 0.7 times the listed spacing. Since all of the area within the detector’s circle of
coverage is suitable for detecting a fire, the shape and dimensions of the detector coverage “square”
in Figure 3 may
be modified. Coverage area should remain within the overall detector circle of coverage as shown in Figure 4.
(1) Heat detector; S = Listed spacing between detectors
Figure 2: Listed heat detector spacing
Figure 3: Detector circle of coverage
Heat detector
0.7
S
0.7
S
1
2
S
1
2
S
1
2
S
1
2
S
1
2
S
S
S
S
S
S
S
Space between detectors
A
A
A
A
B
B
B
B
C
C
C
C
