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Sensor element

A sensor element and pump unit technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as the deterioration of measurement accuracy, and achieve the effect of suppressing deterioration over time

Pending Publication Date: 2021-09-28
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If such evaporation of Au occurs, there is a problem that NOx is decomposed before the gas to be measured reaches the measurement electrode, resulting in poor measurement accuracy (measurement sensitivity).

Method used

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Examples

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Embodiment Construction

[0031]

[0032] First, the schematic configuration of the gas sensor 100 including the sensor element 101 according to the present embodiment will be described. In the present embodiment, the gas sensor 100 is a limiting current type NOx sensor that monitors NOx using the sensor element 101 and measures its concentration. In addition, the gas sensor 100 further includes a controller 110 that controls the operation of each part and determines the NOx concentration based on the NOx current flowing through the sensor element 101 .

[0033] figure 1 It is a diagram schematically showing an example of the structure of the gas sensor 100 including a vertical cross-sectional view along the longitudinal direction of the sensor element 101 . should be explained, figure 1 marked: the xyz coordinates of the right-handed system with the length direction of the sensor element 101 as the x-axis direction, the width direction as the y-axis direction, and the thickness direction as the z-...

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Abstract

The present invention provides a gas sensor capable of suppressing deterioration of measurement sensitivity with time use. In a sensor element of a limited current type gas sensor for measuring the concentration of NOx in a gas to be measured, an inner pump electrode is provided so as to face a first internal cavity that communicates with a gas introduction port into which the gas to be measured is introduced from an external space under a predetermined diffusion resistance. The inner pump electrode is formed from a cermet of a Pt-Au alloy and zirconia, and the surface on which the inner pump electrode is formed includes at least a surface farthest from the heater unit in the thickness direction of the element, among the surfaces defining the first internal cavity, and does not include a surface closest to the heater unit in the thickness direction.

Description

technical field [0001] The present invention relates to a gas sensor for obtaining the concentration of nitrogen oxides (NOx), and particularly relates to suppressing deterioration of measurement sensitivity of a sensor element thereof. Background technique [0002] A limiting current type gas sensor (NOx sensor) using a sensor element mainly composed of an oxygen ion conductive solid electrolyte is known (for example, see Patent Document 1). With this gas sensor, when determining the NOx concentration, first, the gas to be measured is introduced into a cavity (internal cavity) provided inside the sensor element under a predetermined diffusion resistance, and the gas is firstly introduced into a cavity (internal cavity) provided inside the sensor element, using, for example, a so-called main pump unit and An electrochemical pump unit such as an auxiliary pump unit (the first electrochemical pump unit and the second electrochemical pump unit in Patent Document 1) sucks out ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
CPCG01N27/26G01N27/417G01N33/0037Y02A50/20G01N27/4076G01N27/41
Inventor 渡边悠介寺泽谦吾岩井志帆
Owner NGK INSULATORS LTD
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