TITANUS
MICRO·SENS
®
Maintenance
06/13
197
Checking the air flow sensor adjustment
Test the air flow sensor value using the diagnosis software.
Whilst the connected pipe system is initialising, the device first stores the
measured actual value of the air flow as an ideal value, via integrated air
flow monitoring. This ideal value thereafter serves as the reference value for
further evaluation of any air flow fault. Depending on the air flow threshold
selected (see Chapter Design, section on Adjusting Air Flow Sensitivity), the
current air flow value can oscillate more or less around this ideal value dur-
ing operating, without triggering an air flow fault. Only if the air flow threshold
selected is exceeded is the air flow fault signalled by the device and can
thus be forwarded.
The tolerance range for the air flow threshold selected as well as the actual
and ideal values are shown in the diagnosis software. The limits correspond
to the air flow range set. Check the deviation of the actual value from the
ideal value. If it deviates by > ±3/4 from the set threshold, you should test
the pipe system as a precaution (on this, see section "Clearing Air Flow
Fault").
NOTICE
The current air flow value cannot deviate from the ideal value just because
of a fault in the pipe system (break or blockage) but also because of air
pressure oscillations in the environment.
To ensure that the device operates long-term without faults, the air flow sen-
sor must be adjusted to be air pressure-dependent (see Chapter Commis-
sioning). It is only with this type of adjustment that small air pressure oscilla-
tions lie within the monitoring window and thus within the permitted tolerance
range.
WARNING
If the air flow change has been set at less than 30 %, there must be air
pressure-dependent adjustment.
9.9
Operating principle
Checking the actual value
air pressure-dependent
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