Patent ID: 6855238
Filing Date: 2005-02-15
Classification: G01N

Abstract:
1. A measuring device for determining oxygen activity in metal melts or slag melts, comprising a measuring head arranged on one end of a carrier tube, an electrochemical measuring cell being arranged on the measuring head, wherein the electrochemical measuring cell has a solid electrolyte tube ( 1 ) closed on one end and open on an opposite end, the solid electrolyte tube being surrounded on the closed end and at least on a portion of its periphery by a steel tube ( 2 ) closed on one end, wherein a reference material ( 3 ) and a filler material ( 4 ) adjoining the reference material are arranged inside the solid electrolyte tube at its closed end, wherein a metal rod is arranged as an electrode ( 5 ) along the solid electrolyte tube in such a manner that the metal rod stands in contact with the reference material and projects out of the open end of the solid electrolyte tube, wherein the open end of the solid electrolyte tube has a closure, and wherein the closure ( 7 ) is constructed as a cap, which fits on an exterior of the steel tube ( 2 ) or the solid electrolyte tube ( 1 ), and the closure ( 7 ) is gas-permeable and comprises polypropylene.