| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas concentration detection element that has a high temperature preservation property, is prevented from adhesion and deposition of particulates and hence is prevented from occurrence of detection error, and is capable of obtaining a sufficient responsiveness. SOLUTION: The element has a gas concentration detector 2 for detecting, for example, the concentration of oxygen in an exhaust gas and a cover body 3 in double cylinder shape for surrounding a part that is exposed to the exhaust gas. A plurality of gas circulation holes 33, 34 are provided at the tip part in the direction of the axial line of the cover body 3 so that one of them functions as a port for introducing the exhaust gas and the other functions to allow a gas to be exchanged smoothly. The side part of the cover body 3 is made of a closed wall part without any opening, thus preventing the exhaust gas to cool the cover body 3 and the gas concentration detector 2 easily, improving a temperature preservation property, and preventing particulates from being adhered. |
