Acid gas measuring sensors and method of using same

US6423209B1 · kind B1 · utility

Assignee

• ADVANCED TECHNOLOGY & MATERIALS CO., LTD. · US

Inventors

• Martin Weber · Borgo San Lazzaro, DE
• Christoph Braden · Neunburg vorm Wald, DE
• Serguei Tsapakh · Bonn, DE

Key dates

• Filing date: Oct 13, 2000
• Grant date: Jul 23, 2002
• Expiry date: Oct 13, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/0036
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A electrochemical sensor for the detection of traces of HF and/or other acid gases in air, comprising a measuring electrode of an electrochemically active metal oxide powder, a reference electrode for fixing the potential of the measuring electrode close to the equilibrium potential of the oxidation/reduction system of MeOn/Mem+, and a counter electrode. The electrodes are in communicative contact with a hygroscopic electrolyte. The measured gas component changes the pH of the electrolyte, and thus the electrochemical equilibrium of the measuring electrode, to produce a measurable electrical current that is proportional to the concentration of the detected acid gas.