| 摘要 |
A probe (14) comprises a tubular electrical conductor (15) supported by a sleeve of insulating material (16). The two ends of the conductor are connected to couplings (23, 24) for the circulation of a reducing gas through the entire length of the conductor, as well as to an electric circuit (20) kept at a constant voltage and hence permitting measurement of the resistance in a segment (15c) of the conductor which is exposed to the atmosphere of a furnace, the resistivity of the segment varying as a function of the carbon content of the wall of the conductor.
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