摘要：

A thermowell or gas sampling probe comprising an elongated tube with one or more helical fins wound longitudinally along and around at least part of the outer surface of said tube where the width of the fin is in the range 0.005 D to 0.2D; and the depth of the fin is in the range 0.05D to 0.5D; where D is the external diameter or width of the tube. The gas sampling probe comprising an elongate main tubular member having an inlet end and an outlet end and a sampling tube housed within said main tubular member extending from the inlet end to the outlet end.

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