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An oxygen sensing probe of the type in which a sensor tip made of a solid electrolyte is secured within a supporting tube by an hermetic seal. The tip is made of yttria-stabilized zirconia; the tube is made of magnesium-aluminate spinel, calcia and zirconia; and the tip and the tube are bonded toget

An oxygen sensing probe of the type in which a sensor tip made of a solid electrolyte is secured within a supporting tube by an hermetic seal. The tip is made of yttria-stabilized zirconia; the tube is made of magnesium-aluminate spinel, calcia and zirconia; and the tip and the tube are bonded together by a fusion weld consisting of a eutectic mixture of the tip material and the tube material. The coefficient of thermal expansion of the tube material very closely matches that of the tip material so as to prevent the seal from cracking when the probe is cycled rapidly and repeatedly through a wide temperature range. A frustoconical shoulder on the sensor tip engages a slotted frustoconical seat within a tubular outer conductor to establish good electrical contact between the tip and the electrode while allowing gas to circulate freely past the tip.

대표청구항 ▼

A probe for measuring the concentration of oxygen in fluids, said probe comprising an outer tube defining an outer conductor, an inner tube coaxial with and spaced inwardly from said outer tube, a sensor tip secured to said inner tube and composed of solid electrolyte material, two electrodes dispos

A probe for measuring the concentration of oxygen in fluids, said probe comprising an outer tube defining an outer conductor, an inner tube coaxial with and spaced inwardly from said outer tube, a sensor tip secured to said inner tube and composed of solid electrolyte material, two electrodes disposed on opposite sides of said sensor tip, and an inner conductor in electrical contact with one of said electrodes, said probe being characterized in that an electrically conductive sleeve is telescoped tightly into one end portion of said outer tube in electrical contact therewith and is telescoped over said sensor tip in electrical contact with the other of said electrodes, one end portion of said sleeve being formed with an annular frustoconical seat, said tip being formed with a frustoconical shoulder located in faceto-face mating engagement with the seat of said sleeve, the seat of said sleeve being defined by a series of angularly spaced segments having passages therebetween to permit fluid to flow out of the inside of said sleeve and along the outside of said inner tube.