NOVELTY - Method of analyzing content of impurity-depleted hydrogen stream (18) from pressure swing adsorption process involves providing a hydrogen-containing feed stream (13) to a pressure swing adsorption zone, adsorbing methane and carbon monoxide from the hydrogen-containing feed stream in the pressure swing adsorption zone, withdrawing the impurity-depleted hydrogen stream from the pressure swing adsorption zone, and sensing the residual methane content of the impurity-depleted hydrogen stream.    USE - Analyzing content of impurity-depleted hydrogen stream (claimed).    ADVANTAGE - The method enables analysis of impurity content of impurity-depleted hydrogen stream with maximum hydrogen recovery without risk of exceeding permissible threshold values for residual carbon monoxide content in the impurity-depleted hydrogen stream. Due to the physical separation of the product manifold and the purge line, the correlated relationship between the sensed residual methane content of the purge stream and the carbon monoxide content of the product stream may be recalibrated at steady state operation of the pressure swing adsorption process such that accuracy of the process controls is enhanced.    DETAILED DESCRIPTION - Method of analyzing content of impurity-depleted hydrogen stream from pressure swing adsorption process involves providing a hydrogen-containing feed stream to a pressure swing adsorption zone, adsorbing methane and carbon monoxide from the hydrogen-containing feed stream in the pressure swing adsorption zone, withdrawing the impurity-depleted hydrogen stream from the pressure swing adsorption zone, and sensing the residual methane content of the impurity-depleted hydrogen stream. The hydrogen-containing feed stream contains impurity content comprising methane and carbon monoxide. The impurity-depleted hydrogen stream has a residual methane content and a residual carbon monoxide content. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of impurity-depleted hydrogen stream; and    (2) pressure swing adsorption apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of a pressure swing adsorption apparatus including adsorption unit.    Pressure swing adsorption apparatus (10)    Adsorption unit (12)    Hydrogen-containing feed stream (13)    Adsorption bed (14)    Impurity-depleted hydrogen stream (18)