Water separation system for condensation particle counter

Details Water separation system for condensation particle counter Water separation system for condensation particle counter

1991-05-03

1992-06-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 37, G01N 1506

Patent

active

051189593

ABSTRACT:
A continuous flow condensation particle counter employs a working fluid to saturate a gas stream, and then condense onto particles carried in the gas stream as the stream is directed through a condenser and cooled below the supersaturation point. A porous saturation block is positioned beneath the condenser, and receives droplets of working fluid condensate and water as the droplets descend from the condenser by gravity. The saturation block is constructed of a hydrophobic material, whereby it allows the working fluid to pass through but retains water within a collection reservoir centered below the condenser. A vacuum pump and a periodically actuated solenoid valve are employed to introduce a partial vacuum to the reservoir and thereby evacuate accumulated water. The preferred working fluid is a perfluorinated hydrocarbon fluid that is substantially odorless, chemically inert and non-flammable. Water is immiscible in the working fluid, and thus readily separable.

REFERENCES:
patent: 3694085 (1972-09-01), Rich
patent: 3806248 (1974-04-01), Sinclair
patent: 4449816 (1984-05-01), Kohsaka et al.
patent: 4790650 (1988-12-01), Keady
patent: 5026155 (1991-06-01), Ockovic et al.
2nd International Aerosol Conference, Berlin.COPYRGT. 1986 Pergamon Journals Ltd., Printed in Great Britain, M. R. Stoizenburg et al., "Counting Efficiency of An Ultrafine Aerosol Condensation Nucleus Counter: Theory and Experiment", pp. 786-789.

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