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Air sampling apparatus

  • US 4,040,299 A
  • Filed: 11/13/1974
  • Issued: 08/09/1977
  • Est. Priority Date: 11/13/1974
  • Status: Expired due to Term
First Claim
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1. A personal, portable apparatus worn by an operator for the continuous collection, without operator attention, of a time-weighted gas sample for subsequent analysis which comprises:

  • a. an enclosed gas reservoir capable of withstanding a pressure differential of about 30 inches mercury;

    b. an openable and closeable gas flow means communicating with said gas reservoir for allowing gas to flow from the exterior of said reservoir to the interior of said reservoir at a constant rate when there exists a sufficient gas pressure differential between the exterior and interior of said reservoir so that the passing gas achieves a linear velocity in the throat of said gas flow means equal to the velocity of sound in said passing gas, said reservoir and said gas flow means being sized such that a sample can be obtained over a period up to about 24 hours; and

    c. means for attaching the apparatus to the operator.

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