According to an example aspect of the present invention, there is provided an apparatus and method for analysing the purity of a steam flow in a steam line (1). The method comprising the steps of directing a part of the steam flow from the stem line (1) into a sampling pocket (4), wherein said redirected part constitutes a sample of steam; condensing the sample of steam into water in the sampling pocket (4); determining the purity of the condensed sample; and returning the sample back to the steam line (1).

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