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In Space Station Freedom, the water supply will be a closed loop system. Humidity condensate from the cabin and waste hygiene water including urine are to be reclaimed for potable and hygiene uses. Close monitoring of the water quality is mandatory to ensure crew health. The 30-year utilization planned for SS Freedom requires careful planning for water processing and monitoring systems. Perkin-Elmer is developing a Water Quality Monitor (WQM) for the Environmental Control and Life Support System (ECLSS) being developed by the Boeing Aerospace & Electronics Company.* The WQM will monitor impurities in both potable and hygiene water samples.

An Atmosphere Composition Monitor (ACM) is being developed for monitoring the atmospheric composition in the Space Station Freedom. The instrument is part of the Environmental Control and Life Support System (ECLSS) that is being developed by Boeing Aerospace & Electronics.* Monitoring the atmospheric composition in the Space Station Freedom will be essential to ensure crew health. The ACM measures the major atmospheric constituents to provide feedback for the nitrogen/oxygen replenishment control. It also measures carbon monoxide, particulates, and trace organic gases resulting from material outgassing, chemical leaks or spills, metabolic byproducts, and possibly electrical equipment malfunction. Information provided by the ACM can be used to detect cabin air leakage and to verify the proper function of the ECLSS Atmospheric Revitalization system.

The Orion Air Monitor (OAM), a derivative of the International Space Station's Major Constituent Analyzer (MCA) (1–3) and the Skylab Mass Spectrometer (4, 5), is a mass spectrometer-based system designed to monitor nitrogen, oxygen, carbon dioxide, and water vapor. In the Crew Exploration Vehicle, the instrument will serve two primary functions: 1) provide Environmental Control and Life Support System (ECLSS) data to control nitrogen and oxygen pressure, and 2) provide feedback the ECLSS water vapor and CO2 removal system for swing-bed control. The control bands for these ECLSS systems affect consumables use, and therefore launch mass, putting a premium on a highly accurate, fast-response, analyzer subsystem. This paper describes a dynamic analytical model for the OAM, relating the findings of that model to design features required for accuracies and response times important to the CEV application.