MEASURING INSTRUMENT OF TUBE PART

PROBLEM TO BE SOLVED: To provide a measuring instrument for measuring a physical size that has no dead space in a tube, and is formed of a tube part having an opening to which an adapter for storing a measuring probe is attached firmly. SOLUTION: The tube part 2 has a flat part, namely a flat part consisting of a horizontal plane having the opening 3, the adapter 4 fills the opening of the flat tube part, and the adapter 4 is attached by material fusion to a flat tube wall on a layer of the opening 3 or a layer parallel to the flat part. The opening 3 in the flat tube part blocked by the adapter 4 is circular. The flat part of the tube part 2 is constituted sufficiently flatly so that one width B1 of the flat part becomes at least equivalent to or larger than the diameter D1 of the adapter 4. The welding contour in the thickness of the tube wall in the flat part of the tube part 2 envelops the adapter. The part of the horizontal plane is provided in the cross setion of an original tube part. COPYRIGHT: (C)2011,JPO&INPIT