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Leak tester

  • US 4,715,214 A
  • Filed: 10/03/1986
  • Issued: 12/29/1987
  • Est. Priority Date: 10/03/1986
  • Status: Expired due to Fees
First Claim
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1. In a leak tester having means for providing pressurized fluid into a chamber of a fluid receptor, means for isolating said chamber subsequent to provision of the fluid therein, and means for sensing the pressure of the fluid in said isolated receptor, the improvement comprising:

  • means for sequentially determining the sensed pressure at at least four different times during a measuring period following the isolation of the chamber during which period the pressure in said isolated chamber changes exponentially due to a stabilization of the pressurized fluid therein toward a substantially constant value;

    means for calculating from a first group of at least three successive pressure determinations a first end pressure to which the fluid pressure should stabilize and calculating from a second, subsequent group of at least three successive pressure determinations a second end pressure to which the fluid pressure should stabilize;

    means for comparing said first and second calculated end pressures and determining a pressure differential therebetween;

    means for determining a characteristic of the exponential curve defining the rate of the pressure drop due to the stabilization of the pressurized fluid; and

    means for calculating the leak rate from the value of the determined characteristic and the determined pressure differential.

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