System with a power supply unit, a read/write device and a plasma applicator wherein the plasma applicator comprises an electrotechnical core for generating a cold atmospheric pressure or low-pressure plasma for the treatment of human and/or animal and/or technical surfaces, wherein the electrotechnical core has a side facing the surface to be treated and a side facing away from the surface to be treated and comprises the following layers, arranged above one another, starting from the side facing the surface to be treated: - a first insulation layer, - a first electrode structure which is provided with a first contact for establishing electrical contact between the first electrode structure and a power supply unit and which is grounded during operation, - a second insulation layer, which is embodied to galvanically isolate the first electrode structure and a second electrode structure from one another, - a second electrode structure which is provided with a second contact for establishing electrical contact between the second electrode structure and a power supply unit and which is driven during operation by a voltage signal that is supplied by a power supply unit and that is sufficient to ignite a plasma, - a third insulation layer, which is embodied to galvanically isolate the second electrode structure and a third electrode structure from one another, and - a third electrode structure which is provided with a third contact in order to ground the third electrode structure during operation wherein the plasma applicator has a readable memory and is designed to store a special code or hash value in the memory, and wherein the energy supply unit is configured to set certain values for treatment parameters depending on a code or hash value read from the memory in the plasma applicator and, during operation, to emit a corresponding voltage signal to the plasma applicator connected to the power supply unit and/or to check whether a read plasma applicator has already been used or is suitable for a specific plasma treatment, characterized in that the plasma applicator comprises at least one means for ensuring single use of the plasma applicator, in which a feature changes as a consequence of use of the plasma applicator in such a way that a voltage signal sufficient to ignite the plasma can no longer be transmitted to the electrical core, and wherein the read/write device is designed to destroy the memory containing the code or hash value after a plasma treatment, so that after the first use, no high voltage can be released by the power supply unit. - a first insulation layer, - a first electrode structure which is provided with a first contact for establishing electrical contact between the first electrode structure and a power supply unit and which is grounded during operation, - a second insulation layer, which is embodied to galvanically isolate the first electrode structure and a second electrode structure from one another, - a second electrode structure which is provided with a second contact for establishing electrical contact between the second electrode structure and a power supply unit and which is driven during operation by a voltage signal that is supplied by a power supply unit and that is sufficient to ignite a plasma, - a third insulation layer, which is embodied to galvanically isolate the second electrode structure and a third electrode structure from one another, and - a third electrode structure which is provided with a third contact in order to ground the third electrode structure during operation wherein the plasma applicator has a readable memory and is designed to store a special code or hash value in the memory, and wherein the energy supply unit is configured to set certain values for treatment parameters depending on a code or hash value read from the memory in the plasma applicator and, during operation, to emit a corresponding voltage signal to the plasma applicator connected to the power supply unit and/or to check whether a read plasma applicator has already been used or is suitable for a specific plasma treatment, characterized in that the plasma applicator comprises at least one means for ensuring single use of the plasma applicator, in which a feature changes as a consequence of use of the plasma applicator in such a way that a voltage signal sufficient to ignite the plasma can no longer be transmitted to the electrical core, and wherein the read/write device is designed to destroy the memory containing the code or hash value after a plasma treatment, so that after the first use, no high voltage can be released by the power supply unit.