Use of a turbo-molecular pump replaced the need for ion pumps to achieve high vacuum for the mass-spectrometer-based gas analyzer. Ion pumps are unable to pump high concentrations of helium, restricting earlier versions of mass spectrometers to sampling in backgrounds of either nitrogen or air. The HUMS data acquisition and control system was designed to match the standard CORE interface planned to replace the Shuttle Launch Processing System (LPS), but retrofitted to interface with a standard LPS "XCard" when the CORE concept was abandoned during HUMS.
This work was done by Greg Breznik, Barry Davis, and Frederick Adams of Kennedy Space Center; Guy Naylor, Francisco Lorenzo-Luaces, Charles H. Curley, Richard J. Hritz, Terry D. Greenfield, David P. Floyd, Curtis M. Lampkin, Donald Young, Gary N. McKinney, and Don Greene of Lockheed-Martin; and David R. Wedekind, Larry Lingvay, and Andrew P. Schwalb formerly of I-NET. For further information, access the Technical Support Package (TSP), free on-line at www.nasatech.com/tsp under the Test and Measurement category.