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The paper describes the design specifics of the system for oxygen generation by electrolysis Elektron and major results obtained in long-term operation of the system aboard space station Mir. Operational data analysis makes possible to draw a conclusion that the system is capable to attain life parameters for at least 2 years with maintaining serviceability for no less than 8 years without attendance and unit replacement. Based on flight operation the possibility of reducing power consumption by 10 per cent is proven. System design updates are realized in the water electrolysis system intended for the Russian segment of the international space station.

In April 1998 during the 24th prime crew operation the first mock-up of the habitation atmosphere harmful contaminants analyzer was delivered to the MIR Space Station. Concentrations of various compounds including ammonia, freon, aromatic hydrocarbons, nitrogen oxides, carbon monoxide, methane and a number of other harmful contaminants were constantly measured by the device for half a year. The device mock-up test results allowed to make a number of important conclusions underlying the development of the operational monitoring gas analyzer designed for nominal and off-nominal toxicological monitoring of the ISS Service Module (SM) air. The results of measurements made by the device mock-up are presented in the article. The analysis of positive and negative aspects revealed in operation of the device mock-up aboard the MIR Space Station is given, the principle of operation of the gas analyzer intended for the ISS SM is reviewed, technical characteristics are presented in the article.