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Technical Paper

Flight Hydrogen Sensor for Use in the ISS Oxygen Generation Assembly

2005-07-11
2005-01-2870
This paper provides a description of the hydrogen sensor Orbital Replacement Unit (ORU) used on the Oxygen Generation Assembly (OGA), to be operated on the International Space Station (ISS). Makel Engineering, Inc. (MEI) is providing the hydrogen sensor ORU to monitor the oxygen outlet for the presence of hydrogen. The hydrogen sensor ORU is a triple redundant design where each sensor converts raw measurements to actual hydrogen partial pressure that is reported to the OGA system controller. The signal outputs are utilized for system shutdown in the event that the hydrogen concentration in the oxygen outlet line exceeds the specified shutdown limit. Improvements have been made to the Micro-Electro-Mechanical Systems (MEMS) based sensing element, screening, and calibration process to meet OGA operating requirements. Two flight hydrogen sensor ORUs have successfully completed the acceptance test phase.
Technical Paper

Hydrogen Sensor for the ISS Oxygen Generation Assembly

2002-07-15
2002-01-2406
This paper provides a description of the hydrogen sensor used on the Oxygen Generation Assembly (OGA), to be operated on the International Space Station (ISS). The sensor is being designed by Makel Engineering, Inc. (MEI) to monitor the oxygen outlet for the presence of hydrogen. The signal outputs are utilized for system shutdown in the event that the hydrogen concentration exceeds the specified shutdown limit. The hydrogen sensor is currently in the development phase, with 3 development units on test. Preliminary results are positive and have allowed for testing of several specific design requirements, such as sensor performance with nitrogen exposure and varied dew point level. This paper also provides a status of development testing and of progress on the flight design.
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