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Preventive Maintenance
Inlet Assemblies
The PM
impactor is cleaned by separating the upper and lower housings,
2.5
wiping the upper and lower impactor well clean with lint-free laboratory
tissues or a cloth, putting a new filter in the lower impactor well, and
adding 1 ±0.1 ml of impactor oil. The oil should cover the filter uniformly.
Reassemble the well and place in the impactor.
Preparation time can be saved by preparing several spare impactor wells and
storing them in a clean, particulate-free container until needed.
Once a month, with the impactor assembly open, inspect the interior of the
impactor housing, both above and below the impactor well. These areas
should be clean and dry. If necessary, clean the areas with a lint-free wipe.
On a monthly basis, clean the interior of the impactor nozzle jet using a
lint-free pipe cleaner or similar tool. Also monthly, check the O-rings for
distortion, cracks, fraying, or other problems and replace as necessary.
Cyclone Maintenance
If a Sharp-Cut Cyclone or a BGI Very Sharp-Cut Cyclone is being used for
PM
sampling
(Figure
5-4), once every 4 weeks the dust pot should be
2.5
unscrewed, emptied, and cleaned with a lint-free cloth. Once every three
months, the entire SCC assembly should be inspected and cleaned, O-rings
checked for distortion, cracks, fraying, or other problems. Replace O-rings
as necessary.
Inlet
Dust Pot
Outlet
Figure 5-4. PM
Sharp-Cut-Cyclone
2.5
Thermo Fisher Scientific
Model 5030 SHARP Monitor Instruction Manual
5-7
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