Oxygen concentration sensor

An oxygen concentration sensor comprising:

• a plate sensor element;
• a housing having a longitudinal space and a first shoulder;
• a holding member, having a longitudinally extending hole, an upper inclined surface and a bottom in contact with said first shoulder, for holding said sensor element in said hole, said hold member having a second shoulder formed in said longitudinal hole to facilitate installation of said sensor element in a pre-set position and orientation;
• said plate sensor element disposed in said hole and having a flange portion in contact with said second shoulder;
• and
• a fixing member, including powder filled under pressure in a space formed by said longitudinal space and said holding member, for pressurizing said holding member and said plate sensor element;
• wherein
• said inclined surface provides a moderate boundary along an inner perimeter interface between said inclined surface and a periphery of said sensor element, wherein said moderate boundary allows said powder to flow outwards smoothly from said plate sensor element along said inclined surface.

An oxygen concentration sensor comprising:

• a housing having a longitudinal space within which said housing provides support for a hold member disposed therein;
• a plate sensor element disposed in said longitudinal space and having a flange portion;
• said hold member having a longitudinally extending hole receiving said plate sensor element and an upper inclined surface extending outward and downward directly from said hole, with said upper inclined surface forming a moderate boundary along an interface between said inclined surface and said sensor element, said moderate boundary allowing said powder to flow outwards smoothly from said plate sensor element along said inclined surface said hold member holding said sensor element in said longitudinal space, said hold member having a shoulder formed in said hole for receiving said flange portion;
• and
• a fixing member, including powder filled under pressure in a remaining space formed by said longitudinal space and said hold member, for fixing said hold member and said plate sensor element in said longitudinal space.