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PEEK™ insulator ring
with two o-rings
Jet plate
Collection plate with
substrate holder ring
Figure 2: Construction of one impactor stage
The PEEK™ insulators have o-rings on both sides and the collection plate has a
substrate holder ring to keep the collection substrates on their places.
The design of the filter stage is a bit different; it has only one part with insulators
on each side. The filter stage consists of many layers of fine mesh that traps the
particles below 17 nm (nominal). This part should not be disassembled nor does
it need any servicing.
Figure 3: Filter stage
Before assembling the impactor, greased collection substrates should be
inserted on the collection plates to ease the cleaning of the impactor after the
measurement and to prevent bouncing of the particles during the measurement,
please see section 4.2 Collection substrates for details.
© Dekati Ltd. 2011, ELPI+ User Manual
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