Bosch FAS-420-TM-R Operation Manual page 32

32 en | Planning
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The figure shows a typical U-pipe system with three or six air sampling openings and the air
sampling opening diameters calculated according to Standard pipe planning, page 36 .
FAS / FCS
Tab. 4.1: Example of a symmetrical and an asymmetrical U-pipe system
Pipe diameter
As a rule, the pipe system is created using pipes with an external diameter of 25 mm. PVC or
halogen-free pipes can be used. Halogen-free pipes are to be used in preference for
equipment monitoring.
Branch length
To achieve short transport times for the smoke aerosols in the aspiration pipe and thus quick
detection, it is better to plan several short branches than fewer long ones (preferably U and
double U-pipe system).
Pipe configurations
Depending on the area geometry, five pipe configurations can be selected:
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FAS / FCS
FAS / FCS
FAS / FCS
FAS / FCS
Pipe configurations
2020.04 | 5.1 | F.01U.088.878
The diameters of the air sampling openings are determined separately for each pipe
branch. The diameters depend on the total number of air sampling openings in the pipe
branch in question.
2 5 , 2 5 , 2 5 ,
A
2 5 , 2 5 , 2 5 ,
3,4 3,6 3,8
B
2,5 2 5 , 2 5 ,
I-pipe: pipe system without branches.
U-pipe: pipe system that branches into two pipe branches.
M-pipe: pipe system that branches into three pipe branches.
Double U-pipe: pipe system that branches symmetrically into four pipe branches.
I
U
M
U/U
A Symmetrical pipe system
3 0 , 3,0 3 2 ,
B Asymmetrical pipe system
3 0 , 3,0 3 2 ,
3,0 3,0 3 2 ,
Operation guide
Aspiration smoke detector LSN improved
I I-pipe system
U U-pipe system
M M-pipe system
U/U Double U-pipe system
Bosch Sicherheitssysteme GmbH