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Planar polarographic sensor for determining the lambda value of gas mixtures

  • US 5,529,677 A
  • Filed: 05/23/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 09/24/1992
  • Status: Expired due to Term
First Claim
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1. A sensor arrangement which is a multiple printed panel, comprising:

  • a plurality of planar polarographic sensors for determining the lambda value of gas mixtures for use with exhaust gases in internal combustion engines disposed side by side, each sensor of the plurality of planar polarographic sensors being comprised of;

    a planar ceramic carrier sheet having an outer pumping electrode and an inner pumping electrode respectively arranged on opposite planar sides thereof; and

    a diffusion barrier,wherein the outer and inner pumping electrodes, and the diffusion barrier are arranged on the planar ceramic carrier sheet so that measuring gas is fed via the diffusion barrier to the inner pumping electrode,wherein the sensor has front and side edge faces, and the diffusion barrier is configured as a diffusion layer which at least partially covers the inner pumping electrode and which is exposed to the measuring gas at least at one edge face of the sensor, andwherein a diffusion-free planar region of the sensor is provided with an equalizing layer having the same thickness as the diffusion layer, and the equalizing layer is disposed in the same plane with and adjacent to the diffusion layer; and

    wherein the diffusion layers of respective sensors collectively comprise a single common diffusion layer which extends over the entire width of the multiple printed panel and projects beyond the front edge faces of the plurality of sensors.

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