two gas delivery device has an analyzer

A two gas delivery device to cooperate on the one hand, the supply lines of each gas and / or mixture thereof (1,2,3) and, hand, a delivery line of the gas (4), comprising: - a communication establishment means of supply lines (1,2,3) with the delivery line (4), and- means selection of the establishment of communication of one of the supply lines (1,2,3) with the delivery line (4) in four positions, and- a locking means of the selection means in one of four positions. this device is used for calibration of an analyzer.