Apparatus for producing standard gas mixtures

US5239856A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Jacques Mettes · Ivyland, US
• Takako Kimura · Urayasu, JP
• Michael Schack · Düsseldorf, DE

Key dates

• Filing date: Jun 9, 1992
• Grant date: Aug 31, 1993
• Expiry date: Jun 9, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/0006
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention provides an apparatus for performing a process for producing standard gas mixtures which entails PA0 purifying a raw gas using a gas purifier (3) such as a known two stage gas purifier system, thereby generating a high-purity diluent gas; PA0 mixing the high diluent gas and at least one high-concentration standard gas, by generating a medium-concentration gas mixture; dividing the medium-concentration gas mixture into a first flow and a second flow; PA0 selectively mixing the first flow with a sample gas or a high-purity diluent gas or a mixture thereof, thereby obtaining a standard low-concentration gas mixture; and PA0 controlling the pressure of the sample gas, the second flow of the medium-concentration gas mixture and the standard low concentration gas mixture.