Planning
ASD 531, Technical description, T 140 416 en
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4.4.4.2
System limits for planing without “ASD PipeFlow” calculation
Shape
Length from ASD to the last
T-piece/cross
Max. length from ASD to far-
thest sampling hole
Number of sampling holes
per sampling branch
Max. overall length of the
sampling pipe
(Fig. 9 “A”)
(Fig. 9 “B”)
I
---
30 m
1 – 7
30 m
U / T
1 – 10 m
30 m
1 – 6
55 m
H
1 – 10 m
20 m
1 – 3
55 m
E
1 – 10 m
20 m
1 – 4
55 m
Notice
•
The diameter of the sampling holes is specified in the tables in Sec. 4.4.4.3.
•
Physically the sampling holes are to be spaced so that the resulting monitoring areas comply with country-
specific guidelines.
•
The overall length of the sampling pipe must not exceed the system limits as set out in Sec. 4.2.1.
•
The filter-box / filter unit and water retaining box must always be mounted within the first 2 m of the ASD 531.
4.4.4.3
Sampling holes for planning without “ASD PipeFlow” calculation
To ensure that all the sampling holes take in the same amount of air, the diameter of the sampling hole on the sampling tubes
fitted must increase as the distance from the detector housing increases.
Fig. 10 Size of sampling holes
The tables below show the corresponding hole diameters for the numbers in
depending on the number of sampling
holes per sampling branch.
If required, the sampling holes can be created using the special “sampling hole clips”. The sampling hole clips are available in
various sizes (i.e. with hole diameters as indicated in the table above: 2.0 / 2.5 / 3.0 / 3.5 / 4.0 / 4.5 / 5 / 5.5 / 6 / 6.5 / 7 mm).
See also Sec. 5.5.9.
I-shaped sampling pipes
Number of
sampling holes per
sampling branch
Hole diameter in mm for the sampling hole number counted from the detector housing:
1
2
3
4
5
6
7
1
7.0
2
5.5
7.0
3
5.0
5.5
7.0
4
4.5
4.5
5.5
7.0
5
4.0
4.5
5.0
5.0
6.5
6
3.5
4.0
3.5
3.5
4.0
5.5
7
3.5
3.5
3.5
3.5
4.0
4.0
5.5
1 to 7 = sampling hole number
I-
shaped
1
2
3
4
5
6
7
E-
shaped
1
1
1
2
2
2
3
3
3
4
4
4
U/T-
shaped
6
6
5
5
4
4
3
3
2
2
1
1
H-
shaped
3
3
2
2
1
1
1
1
2
2
3
3
