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Investigation of International Space Station Major Constituent Analyzer Anomalous ORU 02 Performance
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Author and Affiliation:
Gardner, Ben D.(United Technologies Aerospace Systems, Pomona, CA, United States);
Burchfield, David E.(United Technologies Aerospace Systems, Pomona, CA, United States);
Pargellis, Andrew(United Technologies Aerospace Systems, Pomona, CA, United States);
Erwin, Phillip M.(United Technologies Aerospace Systems, Pomona, CA, United States);
Thoresen, Souzan(United Technologies Aerospace Systems, Pomona, CA, United States);
Gentry, Grey(Boeing Co., Environmental Control and Life Support Systems, Houston, TX, United States);
Granahan, John(Boeing Co., Environmental Control and Life Support Systems, Houston, TX, United States);
Matty, Chris(NASA Johnson Space Center, Houston, TX, United States)
Abstract: The Major Constituent Analyzer (MCA) is a mass spectrometer based system that measures the major atmospheric constituents on the International Space Station. In 2011, two MCA ORU 02 analyzer assemblies experienced premature on-orbit failures. These failures were determined to be the result of off-nominal ion source filament performance. Recent product improvements to ORU 02 designed to improve the lifetime of the ion pump also constrained the allowable tuning criteria for the ion source filaments. This presentation describes the filament failures as well as the corrective actions implemented to preclude such failures in the future.
Publication Date: Jul 14, 2013
Document ID:
20130014088
(Acquired Jul 26, 2013)
Subject Category: SPACECRAFT INSTRUMENTATION AND ASTRIONICS
Report/Patent Number: JSC-CN-28884
Document Type: Conference Paper
Meeting Information: International Conference on Environmental Systems; 14-18 Jul. 2013; Vail, CO; United States
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 8p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ATMOSPHERIC COMPOSITION; CARBON DIOXIDE; FAILURE; HYDROGEN; INTERNATIONAL SPACE STATION; ION PUMPS; ION SOURCES; MASS SPECTROMETERS; METHANE; NITROGEN; WATER VAPOR
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