TITANUS
PRO·SENS
®
Design
06/13
59
Air flow monitoring
EN 54-20 or ISO 7240-20 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 accomplish this, the air flow sensor system’s triggering threshold must be
set to level II. But level I may also be set as an alternative. It is recom-
mended to conduct an air pressure-dependent air flow compensation for
both of these settings.
Any threshold desired may be set with systems which do not require EN 54-
20 or ISO 7240-20 conformity.
Project planning for the air flow monitoring system in sampling pipes is car-
ried out while taking into consideration the respective national regulations for
each country.
The air flow sensor sensitivity must be adjusted to the application in ques-
tion. Breakage and stoppages must be detected reliability with low suscepti-
bility to malfunction.
The triggering threshold and the air flow sensor sensitivity can be adjusted in
4 levels.
Level I II III IV
In conformity with EN 54-20
or ISO 7240-20
Triggering threshold Small Medium Large Very large
Sensitivity Very high High Medium Low
TIP
It is recommended to always select the greatest possible level which is
permissible according to national standards.
The device’s air flow monitoring enables the system to detect both pipe
breakages outside the device and sudden obstruction in individual aspiration
apertures (e.g. in the event of sabotage to the pipe system). As the dynamic
air flow sensors are only active if level I has been selected for the air flow
monitoring, the aspects described under “Level I limitation” should be taken
into account here.
5.1.3
djusting the
air flow sensitivit
Dynamic air flow
sensor system
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