Electrochemical sensor construction

  • US 4,019,974 A
  • Filed: 12/23/1975
  • Issued: 04/26/1977
  • Est. Priority Date: 02/01/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. Electrochemical sensor construction to determine the oxygen content of gases having a solid electrolyte tube (11) closed at one end (12);

  • an electron conductive porous layer (14) at the outside of the tube covering at least part of the surface exposed to the gases;

    a first connecting terminal (48) in electrically conductive connection with the conductive layer (14);

    an inner conductor (17) on the inside of the tube, and in contact with the inside surface thereof;

    a second connecting terminal (52) in electrically conductive connection with the inner conductor (17);

    an electrically conductive housing (24,

         41) concentrically surrounding the tube and formed to permit ingress of air interiorly of the tube while exposing the outside thereof to the gases, and retaining said terminals in insulated relation with respect thereto;

    wherein the solid electrolyte tube (11) is formed with a shoulder (13);

    a first electrically insulating spacer ring (20) spacing the shoulder from the housing (24);

    a conductive resilient sealing mass (30) in contact with the conductive layer (14) of the solid electrolyte tube (11);

    an insulating sealing mass (31) surrounding the conductive sealing mass (30) and spacing the conductive sealing mass (30) from the housing (24,

         41) to electrically insulate the conductive sealing mass, and hence the conductive layer (14) with respect to the housing;

    a conductive element (34) surrounding the tube and bearing against the electrically conductive sealing mass (30);

    first conductive means (37) contacting the conductive element (34) and the first terminal (48);

    second conductive means (50) in contact with the inner conductor (17) in the interior of the tube and the second terminal (52);

    and an insulating terminal block (43) closing off the housing (24,

         41), the connecting terminals (48,

         52) being secured in and passing through said terminal block to provide electrically and mechanically accessible terminals to the conductive layer (14) and the second conductor (17) and to electrically insulate the tube, and its terminals from the housing (24,

         41).

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