Monitoring pressure interference in gas analyzers

US5088313A · kind A · utility

Assignee

• Hartmann & Braun Aktiengesellschaft · DE

Inventors

• Walter Fabinski · Kriftel, DE
• Georg Taubitz · Oberursel, DE
• Gerhard Franck · Aachen, DE
• Josef Nevole · Frankfurt, DE

Key dates

• Filing date: Nov 29, 1989
• Grant date: Feb 18, 1992
• Expiry date: Nov 29, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/0016
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Apparatus for monitoring and correcting gas analyzers having a measuring chamber with an inlet and an outlet, and a pump for supplying a pressurized measuring gas, further includes a flow throttle for providing flow resistance and being connected to the outlet of the analyzer to obtain a gas pressure in the chamber above a level downstream from the throttle; a pressure transducer is connected to measuring gas pressure of the measuring gas upstream from the throttle but downstream from the pump, preferably also upstream from the analyzer; an output signal from the transducer is used for correcting errors of the measuring signal of the gas analyzer caused by variations of gas pressure in the measuring chamber on account of variations in the gas pressure, for using the same output signal to extract a rate of flow indication as to the measuring gas and for ascertaining that the flow remains within specified limits.