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The future National Aeronautics and Space Administration (NASA) Space Station will require a high level of Control/Monitor Instrumentation (C/M I) for the operation of its critical subsystems. Automatic control and monitoring of subsystem operation will provide the crew with more time to conduct space operations for scientific experiments and commercial processes. Subsystem control and monitoring involves real-time data processing, subsystem fault tolerance and redundancy management, caution and warning, health monitoring and trend analysis, data management and support for on-orbit maintenance and repair. This paper addresses the control and monitor requirements for the Space Station’s Environmental Control and Life Support Systems (ECLSS). Sensor and actuator requirements are detailed. These are identified, along with the required controllers for the ECLSS complement of equipment. A controller hierarchy is also provided.

This paper will present a status review of Spacecraft Air Revitalization System (ARS) integration using regenerable techniques. The paper will address concepts of integration of individual subsystems into an Air Revitalization System, as well as integration of components within subsystems. An ARS design is presented based on the Electrochemical Depolarized Carbon Dioxide Concentrator Subsystem, the Sabatier Carbon Dioxide Reduction Subsystem, the Static Feed Water Electrolysis Subsystem, a condensing Humidity Control Subsystem, and a Water Handling Subsystem to perform the functions of CO2 removal, CO2 reduction, O2 generation, humidity control and by-product water distribution, respectively. The paper will also highlight the numerous advantages of this integration. Trace contaminant control and the nitrogen supply are not included in the ARS described in this paper.