Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 15, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • Outgassing Rate and Ultimate Pressure Limitations of Vacuum Systems
    Yoshio MURAKAMI
    1972 Volume 15 Issue 4 Pages 118-130
    Published: April 20, 1972
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.3131/jvsj.15.118
    JOURNAL FREE ACCESS
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  • Vacuum Engineering in University Education and Training
    In Case of Department of Nuclear Engineering, Hokkaido University
    Toshiro YAMASHINA, Takao HANASAKA, Sadao TANAKA, Michio NAGASAKA
    1972 Volume 15 Issue 4 Pages 131-135
    Published: April 20, 1972
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.3131/jvsj.15.131
    JOURNAL FREE ACCESS
    Download PDF (2923K)
  • An Accurate Flowmeter
    Hisao HOJO, Katsuya NAKAYAMA
    1972 Volume 15 Issue 4 Pages 136-141
    Published: April 20, 1972
    Released on J-STAGE: September 04, 2009
    DOIhttps://doi.org/10.3131/jvsj.15.136
    JOURNAL FREE ACCESS
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    An accurate flowmeter based on the reduced constant-pressure method was devised for admitting the sample gas into the gauge calibration system. This flowmeter consists of a U-tube manometer, an accurate micrometer for measuring the gas pressure, and a diaphragm gauge for checking the deviation of the gas pressure. The gas pressure was kept constant by raising the mercury level in the U-tube manometer. The flow rate could be obtained from the gas pressure, the cross-sectional area of the U-tube manometer, and the rise-up rate of mercury level. With the U-tube manometer of 34. 0±0.1 mmφ in diameter, the flow rate of 10-6 to 10-2 Torr·l/s could be easily measured with an accuracy better than 1%. An actual example in which this flowmeter was used for the gauge calibration was presented.
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