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Method and apparatus for determing dispense volume

  • US 9,304,141 B2
  • Filed: 04/18/2008
  • Issued: 04/05/2016
  • Est. Priority Date: 04/18/2007
  • Status: Active Grant
First Claim
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1. A dispense volume sensor comprising:

  • a dispense needle for dispensing a liquid sample; and

    a receiving cylinder for receiving the dispense needle;

    wherein said dispense needle and said receiving cylinder are arranged such that insertion of said dispense needle a certain distance into said receiving cylinder forms a capacitor to detect amounts of liquid located on the outside of said dispense needle after liquid has been aspirated into, or dispensed from, the dispense needle, wherein said dispense needle is made from electrically conducting materials or an outer surface of said dispense needle is electrically conductive.

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