A pressure swing adsorption system including a plurality of vesse!s(1-7) having one or more layers of adsorbent material therein, a feed gas channel(ll?), a waste channel(120), and a product channel(130). The system also includes at least one parallel channel(140) connected to each of the vessels via a respective conduit with a valve(14). At least one pressure measuring device(M2) is configured to measure a pressure within the parallel channel. And a controller is provided that is configured to monitor the at least one pressure measured by the at least one pressure measuring device during a PSA cycle performed within the PSA system, in order to determine the performance of the cycle and monitor proper operation of the system.
