A pyrolyzer for gas chromatography having a subsidiary heater and a main heater. The subsidiary heater is set below the pyrolysis temperature of the sample, e.g., at 300 degrees centigrade, to drive volatile components from the sample. The main heater is set at a pyrolysis temperature to pyrolize the sample, e.g., at 600 degrees centigrade. The sample is placed in the pyrolyzer in a sample vessel that can be positioned to be heated by main heater, the subsidiary heater and a position not heated by either the main heater or the subsidiary heater.
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