Electrochemical gas sensor

US7608177B2 · kind B2 · utility

Assignee

• DRÄGER SAFETY AG & CO. KGAA · DE

Inventors

• Andreas Nauber · Wulfen, DE
• Dieter Kruger · Dinslaken, DE
• Michael Sick · Timmendorfer Strand, DE
• Christoph Bernstein · Wulfen, DE
• Michael Dietrich · Neuhausen, CH
• Hans-Jurgen Busack · Lübeck, DE
• Rigobert Chrzan · Bad Oldesloe, DE
• Kathrin Hermann · Wulfen, DE

Key dates

• Filing date: Sep 22, 2005
• Grant date: Oct 27, 2009
• Expiry date: Oct 25, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/36
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electrochemical gas sensor with a stacked arrangement of electrodes and nonwoven layers arranged in parallel, comprising at least one measuring electrode (3) and at least one counterelectrode (5). A porous membrane (8) that is permeable to air is in contact with the stacked arrangement of electrodes and nonwoven layers arranged in parallel at least on one side, at least one layer of a hydrophilic nonwoven (7) is located between the electrodes. The porous membrane (8) that is permeable to air and the hydrophilic nonwoven (7) extend into a separate equalization volume (9), which is filled with electrolyte at least partially and is located at least partially in one plane with the electrodes. The separate equalization volume (9) surrounds the electrode arrangement at least partially in this plane, and the porous membrane (8) that is permeable to air is exposed to ambient pressure at least in partial areas. Such sensors are characterized by a flat shape, high insensitivity to shocks, independence from the position, and high tolerance to variations in environmental humidity.