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TITANUS
PRO·SENS
®
TECHNICAL MANUAL
4.1.3
Air flow monitoring
EN54.20 (AS 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 recommended 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 EN54.20
(AS 7240.20) conformity.
Project planning for the air flow monitoring system in sampling pipes is carried
out while taking into consideration the respective national regulations for each
country.
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 adjusted in 4
levels.
Level
I
II
III
IV
In conformity with EN54.20
(AS 7240.20)
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.
Dynamic
air flow sensor system
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.
TIP
