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A system comprised mainly of 90 electrochemical cells has been designed for use as a carbon dioxide (CO2) concentrator in a manned spacecraft. Cabin gas, with a CO2 partial pressure of about 3 mm, is passed across the air cathode of an electrochemical cell. It is concentrated through the carbonate electrolyte and expelled into the hydrogen-filled anode cavity. The total system, as well as the individual cell design, is described. Experimental results are shown for the full (90-cell) system and also for smaller scale (1-and 3-cell) tests..Excellent consistency among the tests was found.

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Abstract. Initial steps to apply a ceramic multi-layer technique to build a new sensor for a Tian-Calvet calorimeter are presented in this contribution. The new sensor has a stacked design of ceramic sensor discs and insulating rings. The development was finite-element method (FEM) supported to design the sensor disc. In the next step, the function of the sensor disc was proven up to a temperature of 600 • C. Finally, the entire stack was tested at room temperature, delivering a resolution of 5 µW and a maximum sensitivity of 8.5 µV mW −1 . The time constant is strongly dependent on the mass of the cuvette. We show that the time constant of the sensor can be more exactly characterized when using a novel low temperature co-fired ceramic (LTCC) cuvette with a low mass and an integrated heater. Then, the time constant can be reduced to T 1/e = 118 s. The new sensor shows similar specifications as commercial devices and presents a good starting point for future high temperature applications.