STRUCTURE AND PERFORMANCE EVALUTION OF HYDROGEN SENSOR FOR MOLTEN COPPER UNDER INDUSTRIAL CONDITIONS

摘要

The galvanic cell-type hydrogen sensor employing CaZr_(0.9)In_(0.1)O_(3-#alpha#) as the solid electrolyte was designed for the measurement of hydrogen activities in molten copper under industrial conditions. The sensor probe consists of the cap-shaped solid electrolyte with porous platinum electrode on the inside and alumina refractory tube. The gas mixture of the composition 4 percent H_2-0.5 percent O_2-Ar was made to flow on the inside electrode. The hydrogen sensor probe was inserted directly into molten copper and the melt was used as the outer electrode. The effect of oxygen activity gradient to EMF was eliminated theoretically by measuring the oxygen activity in the melt simultaneously with an oxygen sensor The high stability of output and excellent response to the change of hydrogen activity were obtained over the wide range of industrial copper melting conditions.