Planning
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ASD 531, Technical description, T 140 416 en
4.5.3
Examples of sampling pipe layouts for equipment monitoring
Fig. 11 Equipment monitoring layout variants (examples)
4.5.4
Sampling fixtures and sampling holes in equipment monitoring
The size and number of sampling holes in a sampling fixture are based on the size of the object’s ventilation slot. The following
approximate values apply:
Size of the ventilation slot
(length x width in cm)
Shape of the
sampling fixture
Number of
sampling holes
Hole diameter
(mm)
< 20 x < 15
I-shaped
2
according to “
ASD PipeFlow
” calcu-
lation
< 30 x < 15
I-shaped
3
< 40 x < 15
I- or T-shaped
4
< 80 x < 20
T-shaped
4
< 40 x < 40
U-shaped
4
> 40 x > 40
H-shaped
4
Notice
•
The sampling fixtures and their sampling holes must be placed directly in front of the object’s airflow.
•
The sampling holes must be facing the outflowing air.
•
On objects with a high air-flow rate (strong ventilation), the sampling holes should be fitted with SF ABS sam-
pling funnels for optimal smoke detection.
•
Symmetry is not required for the sampling fixture.
ASD 531
Computer unit
(view from rear)
Sampling device with
sampling holes
Sampling fixture with
sampling holes
Ventilation opening
Ventilation openings
Flexible
sampling
branch
Flexible sampling
branch
Sampling
branch,
rigid or flexible
Supply line /
trunk line
in hollow floor
Supply line /
trunk line
Pipe line through hollow floor
Direct mounting on ventilated EDP cabinets
Direct mounting on electrical cabinets without ventilation
Pipe line through wall or ceiling
Sampling fixture
with sampling holes
Ventilation openings
ASD 531
2
1
3
6
ASD 531
Supply line /
trunk line
Sampling stub with
sampling hole
in the end cap
Class A
3
I-shaped
(
)
as show
Shape of the sampling pipe:
Class B
4
Class C
6
Example:
maximum possible number of server cabinets
when calculating with ASD PipeFlow
(with 2 sampling holes per cabinets)
:
3
U/T/H-shaped
4
6
