Installation and method for conditioning a gas mixture

A plant for packaging a gas mixture in at least one container (10), said plant comprising:

• a source of a minor gas (1),
• a source of a carrier gas (2),
• a mixer device (3) fluidically connected to the source of minor gas (1) and to the source of carrier gas (2), said mixer device (3) being configured to produce, at an outlet (33), a gas mixture comprising the carrier gas and the minor gas,
• a first transfer circuit (6) fluidically connecting the source of minor gas (1) to the mixer device (3), the first transfer circuit (6) comprising a first flow regulator device (4) configured to regulate the flow of minor gas flowing toward the mixer device (3) according to a first flow setpoint (D1) determined as a function of a target content (C1) of minor gas in the gas mixture,
• a second transfer circuit (7) fluidically connecting the source of a carrier gas (2) to the mixer device (3),
• a delivery circuit (8) configured to deliver the gas mixture from the mixer device (3) to said at least one container (10), the delivery circuit (8) comprising a second flow regulator device (9, FC1) configured to regulate the flow of the gas mixture flowing toward the at least one container (10) according to a second flow setpoint (D),
• the second flow regulator device (9, FC1) comprising a pressure raising member (9), the first flow regulator device (4) comprising several regulator members (41, 42, 43, 44) configured to regulate the flow of minor gas over respective flow ranges, the regulator members (41, 42, 43, 44) being arranged in parallel in the first transfer circuit (6), the plant comprising a control unit (5) connected to the regulator members (41, 42, 43, 44) and configured to select at least one of the regulator members (41, 42, 43, 44) on the basis of at least one comparison of the first flow setpoint (D1) with a minimum value and/or a maximum value of at least one of the flow ranges, the control unit (5) being configured to control the regulator members (41, 42, 43, 44) in such a way as to allow the minor gas to flow between the source of minor gas (1) and the mixer device (3) via said at least one selected regulator member (41, 42, 43, 44) and in such a way as to prevent the minor gas from flowing between the source of minor gas (1) and the mixer device (3) via the non-selected regulator member(s) (41, 42, 43, 44), the first flow regulator device (4) comprising a flow meter associated with each of the regulator members (41, 42, 43, 44) each.