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Abstract

Apparatus for analysing a gas sample comprising a variable volume chamber (8) in fluodynamic connection through a line (21-22) with a sample holding container (30), in which the gas sample is contained, and through a line (11-19) with a plurality of gaschromatographic instruments, for example two (51, 52). These instruments carry out the quantitative and qualitative analysis of the gas sample according to known techniques. Preliminarily, by vacuum pumps (60), the line (11-23) and the variable volume chamber (8) are vacuumed. Then valves (41, 43, 45) are closed in order to exclude the portions of line set between valves (41, 43) and six-way valves (75, 76) respectively, and a delivery duct (23) of the pump (65), which is the general pumping means of the line. Since the variable volume chamber (8) is under vacuum when it is connected to the sample holding container (30), it attracts a certain quantity of gas sample inside. The pressure of the chamber (8), and then of the sample holding container (30), are monitored instantly by a pressure sensor (25), for example an analogic reader (35). Once chosen the column (51, 52) that can be used for carrying out the qualitative and quantitative analysis of the gas sample, the corresponding valve (41, 43) is open. Then, starting from a known volume and pressure, the gas sample is compressed, or expanded, changing the volume of the chamber (8), in order to bring the pressure of the gas same within a predetermined range of values for which the response of the detector (70, 71) is linear.

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