Detecting element for determining the concentration of a gas component in a measuring gas, and method for manufacturing the detecting element

US7210331B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Weyl
• Bernhard Wild · Markgröningen, DE
• Rainer Maier · Tamm, DE
• Michael Liebler · Heilsbronn, DE
• Peter Dettling · Waiblingen, DE
• Lars Berger · Heubach, DE

Key dates

• Filing date: Jun 17, 2004
• Grant date: May 1, 2007
• Expiry date: Aug 17, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4077
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A detecting element is described, in particular a gas sensor for detecting the concentration of a gas component in a measuring gas, including a sensor element which is exposable to the measuring gas and has a connecting end section which is contacted by connecting cables and is exposed to a reference gas atmosphere. The end section is accommodated in a protective sleeve having a radial opening over which a gas-permeable diaphragm covering the at least one radial opening is provided, the diaphragm, in turn, being engaged by a clamping sleeve having at least one radial opening. To avoid the axial penetration of liquids between the clamping sleeve and the diaphragm, which would cause the detecting element to malfunction, the clamping sleeve is caulked axially above and below the radial openings. Both caulking zones are designed in such a way that the diaphragm is compressed with increasing force from the inner caulking edges facing each other to the outer caulking edges facing away from each other.