Analyser configured for extracting and automatically detecting benzene and limonene contained in a polymer, a resin in granular form, a preform, or a recycled polyethylene terephthalate in granular form, wherein said analyser comprises a box body, said box body houses: - a desorption chamber, configured for receiving said sample and extracting benzene and limonene from said sample; - a trap, configured for adsorbing said benzene and limonene coming from said desorption chamber; - heating means for heating said trap to a temperature that is such as to enable said benzene and limonene to be released by said trap; - a gas chromatography capillary column, configured for separating said benzene and limonene coming from said trap; - a detector for detecting said benzene and limonene coming from said gas chromatography capillary column, - a chamber, wherein the analyser is configured to heat the chamber, which contains said gas chromatography capillary column and said detector and is configured to maintain said gas chromatography capillary column and said detector at a substantially uniform temperature, so as to ensure the stability of an analysis, - valve means (13, 14) for automatically adjusting a flow of fluids flowing in said analyser, and/or pressure adjusting means for automatically adjusting pressures of fluids flowing in said analyser, - washing means for washing with air said desorption chamber, and/or heating means for heating said desorption chamber to a temperature that is such as to promote the release of said benzene and limonene from said sample, and/or conveying means for conveying continuously to said trap said benzene and limonene released by said sample in said desorption chamber, and - a control and management unit for collecting and processing analysis data and for controlling said analyser, wherein said box body is provided with a front panel on which there is mounted display means for displaying results of the analysis and/or interface means for enabling an operator to interface with said analyser. - a desorption chamber, configured for receiving said sample and extracting benzene and limonene from said sample; - a trap, configured for adsorbing said benzene and limonene coming from said desorption chamber; - heating means for heating said trap to a temperature that is such as to enable said benzene and limonene to be released by said trap; - a gas chromatography capillary column, configured for separating said benzene and limonene coming from said trap; - a detector for detecting said benzene and limonene coming from said gas chromatography capillary column, - a chamber, wherein the analyser is configured to heat the chamber, which contains said gas chromatography capillary column and said detector and is configured to maintain said gas chromatography capillary column and said detector at a substantially uniform temperature, so as to ensure the stability of an analysis, - valve means (13, 14) for automatically adjusting a flow of fluids flowing in said analyser, and/or pressure adjusting means for automatically adjusting pressures of fluids flowing in said analyser, - washing means for washing with air said desorption chamber, and/or heating means for heating said desorption chamber to a temperature that is such as to promote the release of said benzene and limonene from said sample, and/or conveying means for conveying continuously to said trap said benzene and limonene released by said sample in said desorption chamber, and - a control and management unit for collecting and processing analysis data and for controlling said analyser, wherein said box body is provided with a front panel on which there is mounted display means for displaying results of the analysis and/or interface means for enabling an operator to interface with said analyser.