Apparatus for making dynamic measurements of solid surface...

Details Apparatus for making dynamic measurements of solid surface... Apparatus for making dynamic measurements of solid surface...

G - Physics

01

N

73/1

G01N 19/00 (2006.01) G01N 15/08 (2006.01)

Patent

CA 1205298

ABSTRACT OF THE DISCLOSURE An apparatus is disclosed which applies the dynamic BET-type approach to the measurement of solid surface areas, allowing the pressure on the sample to be varied from a lower, subatmospheric value to a plurality of upper values either greater than or less than atmospheric pressure. Apparatus comprises, in the order of their appearance from upstream to downstream, the following parts: a source of a mixture of gaseous adsorbate and non-adsorbable gas, a pressure reducing valve, a reference circuit and a measurement circuit arranged in parallel, the measurement circuit incorporating a sample holding cell and both said circuits going through a katha- rometer, then converging into a vacuum pump. A flow control valve is installed upstream from the sample holding cell and a throttling valve is inserted between said sample cell and the katharometer.

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