MicroVol-1100 User manual 1.6
Maintenance
6.3.2 Impactor assembly
The impactor assembly should be cleaned and re-greased at least every 10
sampling periods, and sooner if dirt is visible. Remove the impactor assembly
from the filter holder. Remove the rain cap. Remove the connecting tube and
impactor plate by pulling them apart. If necessary, the impactor plate and
connecting tube may be pushed out by inserting a rod down the inlet jet,
taking care not to scratch the jet, then pushing the impactor plate out of the
impactor assembly.
Wipe any dirt off the top of the impaction plates using a lint-free cloth. Wipe
the inside of the holes to remove all grease and dirt. All components should be
wiped initially with a soft clean cloth to remove grease and dirt. They should
then be cleaned using warm soapy water and rinsed a couple of times with
fresh hot water. Use compressed air to dry the components. Inspect the o-rings
for damage, and replace them if necessary. Always apply a trace of o-ring
grease to the o-rings before assembly or they will be damaged.
The impaction plate should be greased lightly in the centre, masking the outer
part of the disc so that the grease is only in the centre of the impaction plate –
covering an area about 10mm in diameter. Light petroleum grease such as
Vaseline can be used in many applications where particulate composition is
not being analysed. Otherwise, silicone grease such as Dow Corning Slipicone
release spray can be used. Dry the plate thoroughly with a clean lint-free cloth.
If necessary, store in a clean zip-lock bag until ready for use.
The acceleration nozzle orifice should be cleaned after approximately 1000
hours of use, depending on loading. Do not use anything sharp to clean the
passage - a soft brush or pipe cleaner and soap solution is sufficient.
Re-assembly
A light smear of silicone O-ring grease should be re-applied to the O-rings as
needed to ease assembly and disassembly. When re-assembling sections with
O-rings, take care to align the pieces well and to twist and slide them together
smoothly to avoid displacing or damaging the O-rings.
The impactor plate locates in the nozzle body, grease side towards the nozzle.
The inlet should be held upside-down during assembly. The adaptor tube
retains the impactor plate. Apply gentle pressure to the adaptor tube to seat it
against the impactor plate.
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