The present invention relates to a steam sample concentrator and conditioning (SSCC) system. The SSCC finds use in concentrating impurities carried in steam (e.g., used in power generation and other industrial processes) and facilitating steam analysis. A device for determining steam purity includes an isokinetic flow control device that maintain isokinetic flow of a steam sample stream through a nozzle, and a pump that prevents the steam sample stream from becoming superheated after the isokinetic flow control device. A contactor condenses the steam sample stream, and a separator that separates a condensate sample stream from a residual steam stream sample. A flowmeter measures a flowrate of the condensate sample stream and an analyzer is configured to measure impurities.