Patent · US Active

Sensor element and method for determining ammonia

US7785457B2 · kind B2 · utility

0Cited by

4References

12Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Thorsten Ochs · Schwieberdingen, DE
Helge Schichlein · Stuttgart, DE
Sabine Thiemann-Handler · Stuttgart, DE
Bernd Schumann · Rutesheim, DE

Key dates

Filing date	Sep 2, 2004
Grant date	Aug 31, 2010
Priority date	—
Expiry date	Nov 29, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG01N31/005
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A sensor element of a gas sensor, which is used for determining the concentration of ammonia and, optionally, at least one further component of a gas mixture, in particular in exhaust gases of combustion engines. The sensor element includes at least one first auxiliary electrode and at least one measuring electrode positioned downstream in the flow direction of the gas mixture, which are in direct contact with the gas mixture, a signal generated by the measuring electrode being used at least intermittently for determining the concentration of ammonia. A potential, at which ammonia contained in the gas mixture is oxidized, is applied at least intermittently to the first auxiliary electrode or the measuring electrode.

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