Patent ID: 6015533
Filing Date: 2000-01-18
Classification: G01N

Abstract:
A sensor housing for directing flow of a gas from an external gas stream over a sensing device comprising:an outer tube longitudinally extending about an axis and having an interior surface and an exterior surface and having a first end opposite a second end;an inner tube insertably mounted within the outer tube and longitudinally extending about the axis, the inner tube having an interior surface and an exterior surface and having a first end opposite a second end;a sensing device positioned within the inner tube; a coupling structure closing the first end of the outer tube and the first end of the inner tube to gas flow;a plurality of flutes on the exterior surface of the inner tube; anda plurality of inlet orifices in the outer tube extending from the interior surface of the outer tube to the exterior surface of the outer tube and an outlet orifice at the second end of the outer tube extending from the interior surface of the outer tube to the exterior surface of the outer tube,wherein each of the plurality of flutes on the exterior surface of the inner tube is arranged in spaced relationship with one or more of the plurality of inlet orifices in the outer tube,wherein the outlet orifice at the second end of the outer tube communicates with the sensing device, andwherein a recessed region of the interior and exterior surface of the outer tube surrounds selected ones of the plurality of inlet orifices in the outer tube, such that the recessed regions engage selected ones of the plurality of flutes in the exterior surface of the inner tube.