Page 67
TITANUS
PRO·SENS
®
TECHNICAL MANUAL
sensitivity of 0.1 % LT/m are approved to meet requirements
for class B. An acceleration aperture in the same size as the
final sampling aperture should be used to increase the transport time.
In accordance with Table A1, the necessary sensitivity of the detector module
amounts to 0.1 % LT/m * 0.85 = 0.085 % LT/m in this case.
2nd option:
Reduction of the number of aspiration apertures
The reduction in sensitivity at the sampling aperture can be compensated for by
reducing the number of aspiration apertures.
In doing so, one should distinguish whether the cross-section of the
acceleration aperture is smaller than or identical to:
- the cross section of the final sampling aperture of a branch (Table B1)
- the double cross section of the final sampling aperture of a branch (Table
B2)
Aspiration apertures
Pipe shape
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
20
21
24
32
I
1
2
3
4
5
6
7
8
9
10
11
12
U
2
4
6
8
10
12
14
16
18
M
3
6
9
12
15
18
Double U
4
8
12
16
20
Quadruple U
8
16
24
Table B1: Reduction in the number of aspiration apertures (one acceleration aperture corresponds to
one sampling aperture here)
Aspiration apertures
Pipe shape
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
20
21
24
32
I
1
1
2
3
4
5
6
7
8
9
10
11
U
2
2
4
6
8
10
12
14
16
M
3
3
6
9
12
15
Double U
4
4
8
12
16
Quadruple U
8
8
16
Table B2: Reduction in the number of aspiration apertures (one acceleration aperture corresponds to
two aspiration apertures)
Example:
A double U-pipe system with 24 aspiration apertures is planned in order to meet
requirements for class B. According to EN 54-20 (AS7240.20), 24 apertures at a
sensitivity of 0.1 % LT/m are approved to meet requirements for class B. An
acceleration aperture double the size of the final sampling aperture should be
used to increase the transport time.
In accordance with Table B2, 16 aspiration apertures are permissible at a
sensitivity of 0.1% LT/m in this case.
The influence of the pipe accessory to be used on the maximum
permissible project planning is to be taken into consideration in
accordance with Chapter 4.2.
INSTRUCTION
