PURPOSE: To perform an automatic recording on an analysis result, by controlling plural numbers of gas chromatographs by a computer after filling sample gas to sample loops by hands in case of analyzing the plural numbers of sample gas by the gas chromatographs.

CONSTITUTION: Each carrier gas is poured from each pouring hole 7 and flows into a gas chromatograph 3 through an eight-way cock 1 and a four-way cock 2 and is discharged out of a system as discharged gas. Eight kinds of sample gas are poured from sample gas pouring holes 5 in turn and are filled in each loop of sample loops 4 through cocks 1. A starting switch of a timer 9 and a switch of a computer 10 are turned on and an analyzing operation is started. When the relays of loops 4 and integral computors 11 are turned on and the first sample gas flows into graphs 3 and it comes to the designated time, the relay of a precutting device 8 is turned on and a sample for which an analysis is needed is discharged. The area recorded in the computor 11 is converted 11 to a signal and the calculated result by the computer 10 is delivered to a teletypewriter 13.