Process for producing low-concentration gas mixtures, and appara

Details Process for producing low-concentration gas mixtures, and appara Process for producing low-concentration gas mixtures, and appara

1989-11-17

1991-10-08

Noland, Tom

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

137 7, G01N 3300

Patent

active

050543091

ABSTRACT:
This invention relates to a process for producing gas mixtures by a plurality of dilution steps of a high concentration standard gas with a high purity diluent gas. According to the invention, as soon as the high purity diluent gas is generated, no further contaminants such as gaseous impurities are added during the further mixing of diluting steps of the process. Only orifices or needle valves are used in the mixing or diluting lines while mass flow controllers and pressure regulators are placed upstream, at the output of the gas sources and/or downstream, i.e. in the gas-venting lines. The invention particularly applies to trace analysis of gas with Atmospheric Pressure Ionization Mass Spectrometry.

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patent: 4474590 (1984-10-01), Bucchianeri
patent: 4977776 (1990-12-01), Shindo et al.

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