Nondispersive infrared gas analyzer

US4281248A · kind A · utility

Assignee

• Hartmann & Braun Aktiengesellschaft · DE

Inventors

• Walter Fabinski · Kriftel, DE
• Udo Deptolla · Nieder-Olm, DE

Key dates

• Filing date: Apr 30, 1980
• Grant date: Jul 28, 1981
• Expiry date: Apr 30, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/61
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The cross-sensitivity of a two-beam infrared gas analyzer is reduced by using two differently long cells for the sample gas in the two beam paths. The path with the short sample gas cell is intercepted by a detector cell having highly absorbing wall while the detector cell in the other path is highly reflective, e.g., made of gold. The two detector cells are interconnected by a differential pressure chamber with capacitive pickup.