A system for extracting and conditioning for analysis a non-cryogenic natural gas liquid sample containing heavy hydrocarbons for passage to a gas sample analyzer as a vapor, the system comprising a) a thermally insulated cabinet for maintaining an internal elevated temperature, said cabinet comprising internal cabinet components, the internal cabinet components including: b) a liquid sample input line ; c) an individual vaporizer for flash vaporizing the liquid connected to the input line ; d) a vaporized sample output line ; e) a heated pressure regulator associated with a pressure sensor and internal vent line for receiving a vaporized sample from the vaporized sample output line , said output line being disposed between the heated regulator and the vaporizer , the heated pressure regulator reducing the pressure of the vaporized sample to an analyzer safe level while preventing dew point dropout; f) an output sample gas conduit line to a gas sample analyzer located outside the insulated cabinet , said output conduit line connected at one end to the heated pressure regulator ; and g) a controller unit electrically connected to the vaporizer and the heated pressure regulator , said controller unit being connected to an electrical power source, the controller for monitoring and controlling the temperature and pressure of the vaporized sample outputted from the heated pressure regulator to fall within an acceptable operation range of the gas sample analyzer; and a shutdown system, wherein the sample input line includes a solenoid actuated liquid interrupt valve and the vaporized sample output line includes a solenoid actuated vapor interrupt valve which is disposed between the vaporizer and the heated regulator , said valves (38, 68; 40) being actuated upon detection of processing conditions by the controller unit deviating from pre-set system parameter ranges of heat, pressure, flow rate and back pressure. a) a thermally insulated cabinet for maintaining an internal elevated temperature, said cabinet comprising internal cabinet components, the internal cabinet components including: b) a liquid sample input line ; c) an individual vaporizer for flash vaporizing the liquid connected to the input line ; d) a vaporized sample output line ; e) a heated pressure regulator associated with a pressure sensor and internal vent line for receiving a vaporized sample from the vaporized sample output line , said output line being disposed between the heated regulator and the vaporizer , the heated pressure regulator reducing the pressure of the vaporized sample to an analyzer safe level while preventing dew point dropout; f) an output sample gas conduit line to a gas sample analyzer located outside the insulated cabinet , said output conduit line connected at one end to the heated pressure regulator ; and g) a controller unit electrically connected to the vaporizer and the heated pressure regulator , said controller unit being connected to an electrical power source, the controller for monitoring and controlling the temperature and pressure of the vaporized sample outputted from the heated pressure regulator to fall within an acceptable operation range of the gas sample analyzer; and <EOS>