This is the final report of a follow-on task to A Study of the Feasibility of Mechanical Pumps for Use with the Pioneer-Venus Probe Mass Spectrom¬eter Inlet System, " Contract NAS2-7384. The objective of this effort was to obtain a small Roots blower from the Arthur Pfeiffer Company of Wetzlar, Germany and to evaluate its performance characteristics.nThe pump was obtained, and a limited performance testing program, in-cluding ultimate/compression ratio tests and throughput tests at three different pump speeds, was performed. Considerable operating experience with the pump was obtained over approximately 200 hours of running. The test results show general agreement with the pump specifications as established by the Arthur Pfeiffer Company. The pump was also disassembled and reassembled, in our presence by a representative of the Arthur Pfeiffer Company, so that we could perform this operation and to that we might view the design details of the pump.nThe report presents a description of the pump design and construction, the overall test plan, procedures, test results, and conclusions. Raw data obtained during the testing is contained in Appendix A.
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