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An Improved Method for Preparing Gravimetric Standard Gas Mixtures of Helium-4 in Nitrogen.

Authors
Bibawy-NA; Emerson-DE
Source
MISSING :7 pages
Link
NIOSHTIC No.
10008167
Abstract
An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen has been developed by the U.S. Bureau of Mines. A single-pan 12-kg analytical balance that has a sensitivity of 3 mg is used to prepare the mixture. The balance will accommodate a cylinder having a volume of approximately 4 l that weighs approximately 5 kg. The method has been improved to a precision of +/-0.04 pct by performing four successive dilutions, by improved handling of gases in the manifold, and by using an improved analytical method to select high-purity gases.
Publication Date
19900101
Document Type
IH; Report of Investigations;
Fiscal Year
1990
NTIS Accession No.
NTIS Price
Identifying No.
RI 9312
NIOSH Division
HEFO;
Source Name
MISSING
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