Patent ID: 7223978
Filing Date: 2007-05-29
Classification: G01N

Abstract:
1. A method for measuring the quantity of chemical species contained in a high-temperature gas and especially the quantity of CO and/or CO 2 contained in a gas output by a metal treatment furnace, and especially an electric arc furnace (EAF) or a basic oxygen furnace (BOF) or converter, characterized in that a portion of the gas to be analyzed is taken off, its temperature is lowered down to less than 300° C. and then at least the quantity of CO and/or CO 2 present in this gas is measured by means of the coherent light signal that is emitted by a diode laser through said gas and recovered upon emerging from said gas wherein: the gas to be analyzed is taken off by means of a probe of axial symmetry, characterized in that the probe includes a part that can move about the axis of symmetry of the probe and can remove the impurities that have built up on the internal wall of said probe by relative rotation of the part and/or of the probe about the axis; and additional pneumatic unclogging means using compressed air are provided.