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Air-in-line and pressure detection

  • US 8,075,546 B2
  • Filed: 05/08/2007
  • Issued: 12/13/2011
  • Est. Priority Date: 07/07/2000
  • Status: Active Grant
First Claim
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1. A method of measuring air content in a sample fluid comprising:

  • determining a base volume change between zero or a negative pressure and a positive pressure in a chamber;

    determining a sample volume change between zero or the negative pressure and the positive pressure in the chamber with a sample fluid; and

    determining air content of the sample fluid by comparing the sample volume change and the base volume change; and

    wherein the chamber has an inlet valve, an outlet valve, and an assembly connected to a pressure source, and the assembly comprises a cassette piston.

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