Gas sensor element and gas sensor unit
US10837938B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2017 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Mar 14, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4074
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas sensor device is equipped with a diffusion controlling portion, a pump cell, and a sensor cell. The diffusion controlling portion is formed to face a major surface of a solid electrolyte body and works to control a rate of diffusion of a measurement gas entering a measurement gas chamber. The pump cell has a pump electrode which contains gold and is formed on the major surface. The pump electrode is located downstream of the diffusion controlling portion in a gas flow direction. The pump cell works to regulate a concentration of oxygen in the measurement gas upon application of voltage to the pump electrode. The sensor cell has a sensor electrode formed on the major surface downstream of the diffusion controlling portion in the gas flow direction. The sensor cell works to measure a concentration of nitrogen oxide contained in the measurement gas upon application of voltage to the sensor electrode. The pump electrode is disposed upstream of the sensor electrode at a distance of 0.2 mm or more downstream away from the diffusion controlling portion in the gas flow direction. This enhances the accuracy in measuring the concentration of NOx.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.