Calculate Mounting Height - Siemens FDF241-9 Technical Manual

Planning
4
Defining the place of installation

4.2.2 Calculate mounting height

34 | 66
Building Technologies
Fire Safety
Example of how to calculate the maximum detection distance
Calculate the maximum detection distance for a heptane fire, 0.1 m
flame detector has a 'Normal' detector sensitivity and a vision angle of 0°.
Known:
S Correction coefficient for detector sensitivity
Gg Fire size wanted
Gb Basic fire size
K Correction coefficient for directional sensitivity
F Correction coefficient for fuel
Gg
´ ´
d = S K
Gb
The maximum detection distance is 21 m.
In order to calculate the maximum mounting height h, you need to know detection
distance d.
Formula for calculating maximum mounting height h
d
h =
3
h Mounting height
Example of how to calculate the maximum mounting height
Calculate the maximum mounting height given a detection distance of 21 m.
Known:
Detection distance d = 21 m
The maximum mounting height is 12 m.
2
0.1 m
´ ´
F = 23 m
2
0.25 m
d Detection distance
in size. The
2
23
0.1 m
0.25 m
1
1.5
´ 1 ´ 1.5 = 21.82 m
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2
2
2018-06-28