A device for separating gases comprises the following components: a source for the gases and flow adjustment means; a membrane unit for the production of a permeate gas and a retentate gas, one of which is the product gas; purity determining means for the product gas; a first control unit for the device; a retentate control system and a product gas pressure measurement, whereby the source has a second control unit for the flow adjustment means as a function of a target value of the gases and the first control unit is connected to the second control unit and to the retentate control system, whereby the first control unit can determine the target value and can control the retentate control system.
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