Abstract: A shielded thermocouple assembly includes a mounting pipe having a flange a first end thereof and extending outwardly therefrom, and a mounting plug having a first end connected to a second end of the mounting pipe, the mounting plug having a recess in a second end thereof defined in part by a circular side wall having at least one opening therein. A fine-wire thermocouple is fixed in the mounting plug and extends into the recess. A rigid shield pipe is disposed concentrically around and spaced from the mounting pipe, the shield pipe being closed by a shield plate proximate the mounting plug second end. An inlet extends through a side wall of the shield pipe in alignment with a side wall of the mounting plug recess, and an outlet extends through the side wall of the shield pipe and is in axial alignment with the inlet.