Access Sensor Technologies UPAS User Guide 19
Optional – Greasing the Cyclone Input
Carefully inspect and clean the inside of the cone in the Cyclone Inlet Cap with a
small soft-bristled brush or pointed foam applicator. Do not use round-tip cotton
swabs or any other brush/swab that is not capable of reaching the bottom of the
pointed conical chamber cavity of the cyclone cap. Any brush/swab that is too
blunt or round may force particulates into the bottom point. Any particulates
remaining at the bottom point of the cyclone cap chamber can become dislodged
during subsequent sampling runs and contaminate the filter.
If grease was previously used, use isopropyl alcohol or ethanol to remove any
remaining grease residue. Do not use any other chemical solvents.
After cleaning, apply a very thin layer of Dow Corning 976 or 976V High Vacuum
grease to the inside of the small cone in the Cyclone Inlet Cap. (Note: If the UPAS
Sampler is used in environments of very high PM concentration, the cyclone can
become overloaded to the point that severe vibration can dislodge rejected PM
trapped on cyclone wall surfaces.) The grease can re-trap any rejected PM which
becomes dislodged in these events and help prevent them from falling into the
filter cartridge. This grease must be removed and replaced between sampling
runs.
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