Measurement of the ultimate pressures of oildiffusion pumps | Zendy

J. Blears | Zendy

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Measurement of the ultimate pressures of oildiffusion pumps

Author(s) -

J. Blears

Publication year - 1946

Publication title -

proceedings of the royal society of london a mathematical and physical sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.814

H-Index - 135

eISSN - 2053-9169

pISSN - 0080-4630

DOI - 10.1098/rspa.1946.0097

Subject(s) - pressure measurement , gauge (firearms) , diffusion , ionization , tube (container) , chemistry , vapours , transient (computer programming) , steady state (chemistry) , mechanics , thermodynamics , materials science , composite material , ion , physics , organic chemistry , metallurgy , computer science , neuroscience , biology , operating system

By using two ionization gauges to measure the pressure in the same vessel it is shown that the vapours of diffusion-pump oils are absorbed in the gauges by two processes, one transient, the other continuous. At the steady state the equilibrium in the electrode space of each gauge is dynamic, and the equilibrium pressure depends upon the dimensions of the tube connecting the gauge to the vacuum system. From the steady-state readings the ultimate pressure of the pump, the partial pressures of the reaction products and the errors of both gauges are calculated for the particular case of Apiezon 'B’ oil. The ultimate pressures obtainable by using a number of oils in fractionating and non-fractionating pumps have been investigated, and it is shown that the values obtained with different kinds of oil in the same pump do not differ widely. The lowest pressures obtainable by oils alone are much higher than is generally believed.

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