Halma Ampac TITANUS PRO-SENS, Technical Manual

Page: 53 / 197

MAN3184 - TITANUS PRO • SENS®
53
5.1.3 Airflow monitoring
AS ISO 7240
‑
20 requires the detection of a 20% change in the total airflow of
the pipe system. In order to accomplish this, the airflow sensor system's
triggering threshold must be set to level II. Level I may also be set as an
alternative. We recommend performing an air pressure-dependent airflow
calibration for both of these settings.
A freely selectable threshold can be set for systems that do not require
AS ISO 7240
‑
20 conformity.
The project planning for aspiration pipe airflow monitoring is then selected
after taking the countries' relevant, national provisions into account.
Adjusting the
airflow sensitivity
The airflow sensor sensitivity must be adjusted to the application in question.
Breakage and blockage must be detected reliably with low susceptibility to
malfunction.
The triggering threshold and the airflow sensor sensitivity can be adjusted in
4 levels.
I II III IV
In conformity with AS ISO
7240 ‑ 20
Threshold value Low medium High Very high
Sensitivity Very high High medium Low
Dynamic airflow sensors
The device's airflow monitoring enables the system to detect both a
breakage at the pipe end and sudden obstruction in individual aspiration
apertures (e.g. in the event of sabotage to the pipe system). As the dynamic
airflow sensors are only active if level I was selected for the airflow
monitoring, the aspects described under "Level I limitation" are to be taken
into account here.
Level I limitations
The airflow monitoring may only be set to level I in the following cases:
▪ Project planning according to "Single hole monitoring" was carried out
(see chapter "Pipe project planning with single hole monitoring")
We recommend to always select the highest possible level that is
permissible according to the national standards.
TIP