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User manual | Filter E-PURE ASPRA P10000
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5.11 Airflow monitoring (optional)
The APSRA P10000-4C can optionally be equipped with a flow sensor for airflow
monitoring. The flow sensor is mounted in a tube on top of the P10000-4C and
measures the air velocity generated by the fan. As stated in chapter 3, the amount
of air flowing through the P10000-4C will decrease as collectors are saturated with
dust. The reduced airflow will automatically result in a lower inlet air velocity. Hence
eventually the air velocity generated at a given fan speed will be reduced.
To monitor the airflow and hence performance of the P10000-4C, first the air velocity
with new, fresh collectors must be determined. The P10000-4C will automatically
detect the presence of a flow sensor and, after sensor warm-up, perform a reference
measurement. This is the air velocity with new fresh collectors. Subsequently the
P10000-4C will periodically measure the air velocity and compare to the reference
velocity. If the actual air velocity drops below a certain percentage (usually 75%) of
the reference velocity, the collectors are likely saturated. The system will then issue a
“LOW FLOW” measurement.
To exclude the influence of the fan speed setting (a lower fan speed will automatically
result in a lower air velocity), the measurement is always performed at 100% fan
speed. If the system is set to 100% the measurement is continuous. If the system is set to
a lower fan speed, measurement of the air velocity is done after each cleaning routine.
The system will then speed up to 100 % for a short interval. When the system has been
turned off and on again it will also automatically rev up to 100 % and measure the
airflow.
In case of a “LOW FLOW” warning:
•
First manually start the cleaning routine using the “start brush” button
•
One could attempt to reduce the amount of dust deposited on the surface of the
collectors and (optional) pre-filters:
•
Switch off the system
•
Open the filter housings and remove the collectors and use an industrial
vacuum cleaner to remove the dust from the inner side (the side normally
facing the coarse filter). Collected dust can contain contaminants originating
from use. For correct handling of collected dust, consult applicable health
and safety standards, or contact an industrial hygienist. To avoid the risk of
disease or injury, always use appropriate airway protection and protective
clothing when handling collected dust.
•
In case the optional pre-filters are mounted, these can be cleaned using an
industrial vacuum cleaner as well.
•
Return the collectors and pre-filters and close the filter housings.
•
When the system is restarted, it will automatically start a new measurement
(this might take some minutes), during which the LOW FLOW measurement
stays active. If the system still reports a LOW FLOW after 10 minutes, the
collectors should be replaced.
•
Replace the collectors with new collectors if the system still reports a LOW FLOW
condition after the actions above.
•
A new reference measurement needs to be initiated after mounting new filters,
by five short presses of the “start brush” button (like the resetting of the filter timer
for systems not equipped with a flow sensor). The system will then determine a
new reference point for the air velocity
By short-pressing the start-brush button the system is thus instructed to determine a
new reference point for the air velocity, ONLY DO THIS IF A COMPLETELY NEW SET OF
FILTERS HAS BEEN MOUNTED. If a reference point is measured with filters that are not
freshly mounted, the automatic airflow monitoring will not function correctly.
5. Usage
