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Planar hematocrit sensor incorporating a seven-electrode conductivity measurement cell

  • US 6,058,934 A
  • Filed: 10/29/1996
  • Issued: 05/09/2000
  • Est. Priority Date: 11/02/1995
  • Status: Expired due to Term
First Claim
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1. A fluid conductivity measuring sensor comprising:

  • a substrate comprising an insulating material adapted to define a flow path across the substrate surface when the substrate is installed in a cell of a fluid flow system;

    seven electrodes disposed in parallel alignment on the substrate, the electrodes comprising;

    a central electrode adapted to be in electrical communication with a source of current when the substrate is installed in the cell of the fluid flow system,an outermost pair of electrodes symmetrically spaced on either side of the central electrode and adapted to be electrically connected as a return current path to the current source at a reference potential when the substrate is installed in the cell of the fluid flow system;

    a first pair and a second pair of voltage measuring electrodes disposed symmetrically on opposite sides of the central electrode, the first pair and the second pair adapted to be electrically connected in parallel to instrumentation to measure the potential difference across each of the pairs of voltage measuring electrodes when the substrate is installed in the cell of the fluid flow system.

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