APPARATUS FOR MEASURING CONCENTRATION OF GAS IN GAS CHROMATOGRAPHY DEVICE

摘要

PURPOSE:To make it possible to bring twelve hr which has been required for excluding mixed air to zero hr, by properly arranging a four-way valve to change over a carrier gas bomb in a using side to a carrier gas bomb in a preparatory side. CONSTITUTION:The first valve port 14 and third valve port 18 of a four-way valve 13 are connected to carrier gas bombs 2, 3 and the second valve port 15 thereof is connected to an introducing pipe 17 connected to a gas chromatography device while the fourth valve port 19 is opened to the air in a freely openable and closable manner and, by the change-over communication state of the first, the forth valve ports 14, 19 and the second, the third valve ports 15, 21 are freely changed over to the communication state of the first, the second valve ports 14, 15 and the third, the fourth valve ports 18, 19. Therefore, air mixed during replacing and attaching work of the carrier gas bombs 2, 3 in a using side and a preparatory side can be purged during a time when other carrier bomb is used and, as the result, the defect of a conventional apparatus held under an analysis impossible state for 12hr at the change-over time of a carrier gas can be completely eliminated.