8.8 Check of the
Air Flow Sensor Adjustment
Close the housing of the air sampling smoke detection system before the
air flow sensor adjustment check.
Check the air flow sensor value by means of the diagnostic device.
Independent of
Air
Pressure
The standard ranges of the air flow variations for the small threshold are
± 90%, for the medium threshold ± 50% and for the large threshold
± 25%. These values already contain temperature and air pressure varia-
tions if the sensor adjustment is dependent on the air pressure (for the
adjustment type refer to the commissioning protocol).
Dependent on
Air
Pressure
If the sensor adjustment is independent of the air pressure air pressure
variations can considerably increase these values which should not lead
to a fault signal.
Consider that the measured value permanently changes due to tempera-
ture and air pressure variations.
Variations
If the measured value is not within the range of the allowed tolerances
the air pressure varies and another fault is present. In this case check the
pipe system for tightness and blockage of the air sampling points (refer to
chapter 7.3, section "Trouble Shooting"). If this check leads to no nega-
tive results check the ventilator fan in the air sampling smoke detection
system for soiling and exchange the air flow sensor filter if required (refer
also to chapter 8.8 "Exchange of the Air Flow Sensor Filter"). If the faults
are still present verify the air flow monitoring electronics by connecting a
test pipe to the device and by re-adjusting the air flow.
If the air flow monitoring system is damaged only authorized personnel
is allowed to exchange it!
If the pipe network has been modified during the trouble shooting or if the
air flow sensor filter has been exchanged re-adjust the air flow.
Register the adjustment type (dependent on air pressure or not) and, if
required, the values of the air pressure, the height above sea level and
the set voltage at MP1 / MP2 in the commissioning protocol.
INSTRUCTION
ATTENTION
INSTRUCTION
