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INSTRUMENT FOR DETERMINING PERMEATION RATES THROUGH A MEMBRANE

  • US 3,590,634 A
  • Filed: 05/05/1969
  • Issued: 07/06/1971
  • Est. Priority Date: 05/05/1969
  • Status: Expired due to Term
First Claim
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1. An instrument for determining permeation rates through a membrane comprising a permeation cell having upstream and downstream compartments separated by a membrane clamped within the cell, a line for continuously passing a gaseous permeant to the upstream cell compartment and from thence to the atmosphere, a line for passing a current of a carrier gas first to the downstream cell compartment and then to a permeant detector means for effecting a substantially continuous determination of the relative amount of permeant in any carrier gas stream passed through said detector means, and associated with a recorder, a bypass line permitting the carrier gas to be detoured around the downstream compartment as the latter is periodically shut off from the system, and means for making controlled variations in the temperature of the permeation cell while continuously making the aforesaid determination when continuously passing the gaseous permeant to the upstream cell compartment and the carrier gas to the detector via the downstream compartment.

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