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TE-WILBUR OPERATIONS MANUAL REV 002.22 4/27/2017
Tisch Environmental 1-TSP-AND-PM10 sales@tisch-env.com www.tisch-env.com Page 121 of 185
13.6 Filter Holder Maintenance
The filter holder is maintenance free with the exception of tightening or
loosening the mechanism if the system should become loose or is having an
issue passing a leak check.
There are o-rings on the top and bottom mate pieces that seal the filter cassette,
inspect these for wear or damage if there appears to be a leak. Replace if
needed. Tisch Environmental part number TE-W-FH6 for (2) filter holder o-
rings.
To replace the filter holder o-rings:
o Remove the filter holder from the enclosure by removing the downtube,
the four bolts on the filter holder plate and disconnecting the sample
tubing to remove the filter holder from the enclosure.
o Remove the 6 screws on the top of the filter holder to remove the top
mate piece.
o The o-ring can be removed with a small thin flat-blade screwdriver by
pushing the screwdriver into the o-ring groove and prying the o-ring
from the groove.
o Replace with a new o-ring and push the o-ring into the grove with your
finger, ensure it gets seated entirely.
o Using the small thin flat-blade screwdriver pry the bottom mate o-ring
from the groove.
o Replace with a new o-ring and push the o-ring into the grove with your
finger, ensure it gets seated entirely.
o Place top mate back on top of the filter holder aligning the 6 holes and
secure with the 6 bolts.
The filter holder should be cleaned on a monthly basis to keep stray particulate
matter from affecting sampling results. The inside of the bottom and top mate
and the top tube can be cleaned with distilled water or a general purpose cleaner
and a soft cloth.
See section 4.4, adjusting the filter holder for information on making
adjustments to the filter holder mechanism.
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