Differential thermolements

Claim 1

A differential thermoelement combination for the indirect, quantitative determination of an alloying constituent in conductive melts having several constituents, comprising: a) a measuring-instrument carrier in the wall of a furnace and the like; b) a differential measuring unit including a first thermoelectrode of electrically conductive material disposed in an aperture of said carrier, and a second electrode of similarly electrically conductive but refractory material secured within said first electrode, a common leg between said electrodes being constituted by the melt in the furnace; insulating means between said electrodes, said second electrode having at least one longitudinal bore closed with respect to the melt; and c) a thermoelectric temperature measuring unit, physically within and operatively associated with said differential measuring unit, including a thermoelement arranged at the bottom of said at least one bore, insulated from the melt, for establishing the melt temperature; said measuring units being electrically connected to two voltmeters, one for said differential measuring unit between said electrodes, and the other for said temperature measuring unit between said thermoelement and said second electrode, the latter being common to said units; whereby exact determination of the momentary alloying composition is obtained in close proximity of said temperature measuring unit, the same allowing a melttemperature measurement substantially simultaneously with a quantitative determination of the particular alloying constituent, the latter by way of said associated differential measuring unit.