Theory of Operation B-19
Figure B-8
Location of Flow Paths Contributing to Diffusion Losses
The total penetration through the system is the product of the individual
penetration values:
Determination of P
1
The penetration through the impactor assembly was determined
experimentally using all three impactor sizes (0.0457 cm, 0.0508 cm, &
0.071 cm) and a variety of flow rates. P
1
is dependent on the Reynolds
number so it is affected by the flow rate and the gas properties of the
working gas. When using an impactor, it is important to stay within the
recommended flow ranges to achieve the highest accuracy for the
Diffusion Loss Correction.
Determination of P
2
The penetration through the internal passages of the Model 3080 and
Model 3082 Classifier (including the Model 3077/3077A neutralizer) was
determined experimentally at a variety of flow rates. P
2
is a function of the
particle diffusion coefficient and flow rate.
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