Design
TITANUS
TOP·SENS
®
/Rev.a
64
06/13
Figure 33: Pipe design for dual detector dependency
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
5.1.3
Adjusting the
air flow sensitivity
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