Patent · US Active

Measuring sensor

US7998327B2 · kind B2 · utility

0Cited by

7References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Jens Schneider · Anderson, US
Detlef Heimann · Gerlingen, DE
Thomas Wahl · Pforzheim, DE
James Richard Waldrop · Belton, US

Key dates

Filing date	Nov 17, 2003
Grant date	Aug 16, 2011
Priority date	—
Expiry date	Jul 30, 2026

Classification

Technology area (CPC G)Physics
CPC primaryG01N27/4077
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A measuring sensor is described for determining a physical property of a measured gas, especially for determining the oxygen concentration or the pollutant concentration in the exhaust gas of internal combustion engines, which has a sensor element that is exposable to the measured gas which is at least partially coated with a protective layer that protects against harmful components in the measured gas. In order to achieve producing a “contamination protection”, that is cost-effective from a manufacturing technology point of view, particularly against silicon compounds and phosphorus compounds, the protective layer (26) is made of highly active γ- or δ-aluminum oxide (Al2O3) having additives of compounds of the alkaline metals group, the alkaline earths group, the IV B subgroup or the lanthanides group.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.