TITANUS
SUPER·SENS
®
Pipe
Design
TSS_04_A-en-e
Data: 02/09
4 –
7
4.1.3 Air flow monitoring
EN 54-20 requires the recognition of a 20 percent change in the air flow
volume by the detector module’s air flow sensor system. In order to ac-
complish this, the air flow sensor system’s triggering threshold must be
set to level III. But level I and II may also be set as an alternative. It is
recommended to conduct an air pressure-dependent air flow compensa-
tion for both of these settings.
Any threshold desired may be set with systems which do not require EN
54-20 conformity.
Project planning for the air flow monitoring system in sampling pipes is
carried out while taking into consideration the respective national regula-
tions for each country.
Graduation of the Air
Sampling Points
For a symmetric detection it is necessary that all air sampling points have
nearly the same air throughput. For this reason with large distances be-
tween the air sampling points (> 2 m) the air sampling point diameters
have to become larger towards the end of the pipe. The required diame-
ters are given in the tables of the chapter 4.2.4.
Adjusting the
air flow sensitivity
The air flow sensor sensitivity must be adjusted to the application in
question. Breakage and stoppages must be detected reliability with low
susceptibility to malfunction.
The triggering threshold and the air flow sensor sensitivity can be ad-
justed in 4 levels.
Level I
II
III
IV
In conformity with EN 54-20
Triggering threshold
Small
Medium
Large
Very large
Sensitivity Very
high
High
Medium
Low
It is recommended to always select the greatest possible level which is
permissible according to national standards.
TIP