Sampling and Measurement of Mass Concentration

Sampling and Measurement of Mass Concentration -...

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9/13/11 Outline Aerosol Sampling System Isokinetic Sampling Anisokinetic sampling Sampling from Still Air Transport Losses Measurement of Mass Concentration Direct-reading Instruments 22
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9/13/11 Aerosol Sampling System Aerosol measurement frequently requires that an  aerosol sample be conveyed to a measurement  device, which is accomplished by withdrawing a  sample from its environment and transporting it  through sample lines to the device.  An aerosol sampling system generally consists of    1.  A sample inlet    2.  A sample transport system  consisting of the  necessary plumbing to convey the aerosol sample to  the measuring instrument or to a storage chamber. 33
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9/13/11 Aerosol Sampling System 44 (Ref: Aerosol Measurement - Principles, Techniques, and 
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9/13/11 Isokinetic Sampling What is isokinetic sampling? A procedure to ensure that a representative sample of aerosol enters the inlet of a sampling tube when sampling from a moving aerosol stream. 55
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9/13/11 Anisokinetic sampling A failure to sample isokinetically Result?  C: concentration in the probe; C0: concentration in the free stream; (a)  Misalignment Stk>6: 0.01<Stk<6: Stk<0.01: 66
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9/13/11 Anisokinetic sampling (b) Superisokinetic sampling, U>U0 77
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9/13/11 Anisokinetic sampling (c) Subisokinetic sampling, U<U0 88
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9/13/11 Anisokinetic sampling U= U 0 99
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This note was uploaded on 09/11/2011 for the course ENV 6130 taught by Professor Wu during the Spring '08 term at University of Florida.

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Sampling and Measurement of Mass Concentration -...

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