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Simple thermal conductivity cell using a miniature thin film printed circuit for analysis of binary gas mixtures

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4 Author(s)
Devoret, M. ; Service de Physique du Solide, et de Résonance Magnétique, C.E.N. Saclay BP N °2, 91190 Gif‐sur‐Yvette, France ; Sullivan, N.S. ; Esteve, D. ; Deschamps, P.

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We describe a thermal conductivity cell for the measurements of the composition of binary gas mixtures. The main advantage of the cell is that its response is pressure independent in the range 20–100 Torr. The apparatus, of the parallel plate type, uses a very thin printed circuit film as the hot plate in order to achieve a fast response time. The cell was designed and operated to determine the ortho‐para‐composition of hydrogen gas samples but it also works reliably as an analyser of 3He–4He gas mixtures. In both cases the precision of the instrument is better than 10-2 for the mole fraction.

Published in:

Review of Scientific Instruments  (Volume:51 ,  Issue: 9 )