Model 11-R
GRIMM AEROSOL TECHNIK GmbH & Co.KG Seite 68 von 83
6.2 Replacement of the PTFE filter
Turn the device off and disconnect the power supply. Loosen the
bayonet closure in the filter chamber cover. This closure has a
mechanism to prevent it from falling out. Carefully open the filter
chamber cover. Now remove the old filter with suitable tweezers.
Make sure that the dust collected on the filter does not get into the
instrument, since this would get the measuring cell dirty. If needed,
turn the device with the opened filter chamber cover so the bottom
faces down and remove the PTFE filter.
Conventional paper towel or a soft brush are best for cleaning the
filter chamber.
Now use the tweezers to centre a new filter on the large O-ring in the
filter chamber. Do not let the filter touch the small O-ring. Note Section
5.6.1 for gravimetric analysis. Close the cover so that the filter does
not shift, and turn the bayonet closure to a perceptible stop (not too
tight).
The maximum runtime on battery and the service life of the pump are decreased as
the filter contamination increases. Make sure to replace the filter in a timely manner
for this reason, no later than when the corresponding warning is displayed. A filter
load over 20 mg should be avoided if possible.
Figure 6-4: Cleaning the
filter chamber
Figure 6-5: Inserting the new
filter
Figure 6-3: Filter removal
Die maximale Laufzeit bei Batteriebetrieb, aber auch die Lebensdauer der Pumpe, neh-
men mit steigender Filterbeaufschlagung ab. Wechseln Sie den Filter daher rechtzeitig,
spätestens beim Anzeigen der entsprechenden Warnmeldung. Eine Filterbeladung über
20 mg sollte möglichst vermieden werden.
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