A method of managing a unit for treating a gas by pressure swing adsorption, the unit comprising: - at least N adsorbers, N being an even number greater than or equal to 6, the N adsorbers being arranged in pairs, - a plurality of isolation valves, for selectively isolating at least one pair from the unit, - a plurality of cycle valves to control the pressure cycle of each adsorber, - each pair being arranged to be selectively isolated, so that the isolation of a pair enables the two adsorbers of the pair to be fluidically isolated from the unit, the isolation of a pair being achieved by closing at least one isolation valve, - a control device, - a plurality of interfaces for access to instrumentation means for each adsorber, characterised in that when a first pair is fluidly isolated from the unit by the closure of at least one isolation valve, the first pair comprising a first adsorber and a second adsorber, and the control device being configured to control only N-2 adsorbers of the unit, the isolation of a third adsorber comprises the steps of: - set the control device to control only N-4 adsorbers in the unit, - fluidically isolating a second pair from the unit by closing at least one isolation valve, the second pair comprising the third adsorber and a fourth adsorber, - fluidically isolating one of the first and second adsorbers, so that it is isolated from the unit independently of the fluidic isolation of the pair to which it belongs, in particular by installing at least one hermetic plug, - fluidically isolating the third adsorber, so that it is isolated from the unit independently of the fluidic isolation of the pair to which it belongs, in particular by installing at least one hermetic plug, - while the first and second pairs are fluidically isolated from the unit, configure the interfaces so as to swap the instrumentation means of the other of the first and second adsorbers and the instrumentation means of the third adsorber, - place the first and second pairs in fluid communication with the unit by opening at least one isolation valve, - set the control device to control only N-2 adsorbers in the unit. - at least N adsorbers, N being an even number greater than or equal to 6, the N adsorbers being arranged in pairs, - a plurality of isolation valves, for selectively isolating at least one pair from the unit, - a plurality of cycle valves to control the pressure cycle of each adsorber, - each pair being arranged to be selectively isolated, so that the isolation of a pair enables the two adsorbers of the pair to be fluidically isolated from the unit, the isolation of a pair being achieved by closing at least one isolation valve, - a control device, - a plurality of interfaces for access to instrumentation means for each adsorber, characterised in that when a first pair is fluidly isolated from the unit by the closure of at least one isolation valve, the first pair comprising a first adsorber and a second adsorber, and the control device being configured to control only N-2 adsorbers of the unit, the isolation of a third adsorber comprises the steps of: - set the control device to control only N-4 adsorbers in the unit, - fluidically isolating a second pair from the unit by closing at least one isolation valve, the second pair comprising the third adsorber and a fourth adsorber, - fluidically isolating one of the first and second adsorbers, so that it is isolated from the unit independently of the fluidic isolation of the pair to which it belongs, in particular by installing at least one hermetic plug, - fluidically isolating the third adsorber, so that it is isolated from the unit independently of the fluidic isolation of the pair to which it belongs, in particular by installing at least one hermetic plug, - while the first and second pairs are fluidically isolated from the unit, configure the interfaces so as to swap the instrumentation means of the other of the first and second adsorbers and the instrumentation means of the third adsorber, - place the first and second pairs in fluid communication with the unit by opening at least one isolation valve, - set the control device to control only N-2 adsorbers in the unit. - set the control device to control only N-4 adsorbers in the unit, - fluidically isolating a second pair from the unit by closing at least one isolation valve, the second pair comprising the third adsorber and a fourth adsorber, - fluidically isolating one of the first and second adsorbers, so that it is isolated from the unit independently of the fluidic isolation of the pair to which it belongs, in particular by installing at least one hermetic plug, - fluidically isolating the third adsorber, so that it is isolated from the unit independently of the fluidic isolation of the pair to which it belongs, in particular by installing at least one hermetic plug, - while the first and second pairs are fluidically isolated from the unit, configure the interfaces so as to swap the instrumentation means of the other of the first and second adsorbers and the instrumentation means of the third adsorber, - place the first and second pairs in fluid communication with the unit by opening at least one isolation valve, - set the control device to control only N-2 adsorbers in the unit.