Abstract: A sampler for drawing a sample of molten metal for analysis for hydrogen, the sampler has a tubular body of inorganic refractory material having low thermal conductivity and being substantially impermeable to hydrogen, and a readily meltable portion at one end and a hydrogen collection chamber at the other end. An inner tube is completely enclosed within the tubular body and is of a hydrogen permeable material and has a cylindrical space therewithin and defines with the inner surface of the tubular body an annular space between the inner tube and the body. It has apertures communicating the spaces. One of the spaces is open at the end corresponding to the readily meltable portion for receiving molten metal thereinto when the meltable portion is melted when the one end of the sampler is inserted into a bath of molten metal. The end of the one space which is toward the other end of the tubular body from the hydrogen collection chamber is sealed.

Abstract: Hydrogen in a metal, particularly in a welded metal, can be quantitatively measured by a simple apparatus using sequence control or computer control.The lower limit of hydrogen to be measured according to this invention is much lower yet is more accurate as compared with the prior mechanism of this field.