GAS SENSOR ELEMENT AND GAS SENSOR

• Main Authors: KAMATA KENTARO, SUZUKI YOSUKE, KOJIMA AKIYOSHI, FURUTA SAI
• Format: Patent
• Language: English; Japanese
• Published: 03.07.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To provide a gas sensor element that is superior in responsiveness to NO.SOLUTION: A gas sensor element 10 according to the present invention includes an element body 100 in which multiple ceramic sheets 121 or the like are laminated, a pump cell 110 for adjusting the oxygen concentration in a measurement target gas introduced into the element body 100, a detection chamber 160 formed inside the element body 100 in which the measurement target gas is introduced after adjusting the oxygen concentration, and a layered cathode electrode 133 which is housed in the detection chamber 160 and decomposes NO. The relation between the volume V1 of the detection chamber 160 and the volume V2 of the cathode electrode 133 in the gas sensor element 10 satisfies any one of the following conditions (A) and (B). Condition (A): The volume V1 is 0.047 mm3 or more and 0.065 mm3 or less and the volume V2 is 0.030 mm3 or more and 0.059 mm3 or less. Condition (B): The volume V1 is 0.047 mm3 or more and 0.125 mm3 or less and the volume V2 is 0.044 mm3 or more and 0.059 mm3 or less.SELECTED DRAWING: Figure 5 【課題】ＮＯに対する応答性に優れたガスセンサ素子等の提供。【解決手段】本発明のガスセンサ素子１０は、複数のセラミックシート１２１等が積層された素子本体部１００と、素子本体部１００内に導入される測定対象ガス中の酸素濃度を調節するポンプセル１１０と、素子本体部１００の内部に形成され、前記酸素濃度の調節後の前記測定対象ガスが導入される検出室１６０と、検出室１６０に収容され、ＮＯを分解する層状のカソード電極１３３とを備える。ガスセンサ素子１０における検出室１６０の容積Ｖ１とカソード電極１３３の体積Ｖ２との関係が、以下に示される条件（Ａ）及び条件（Ｂ）の何れか１つを満たす。条件（Ａ）：容積Ｖ１が０．０４７ｍｍ３以上０．０６５ｍｍ３以下であり、かつ体積Ｖ２が０．０３０ｍｍ３以上０．０５９ｍｍ３以下である。条件（Ｂ）：容積Ｖ１が０．０４７ｍｍ３以上０．１２５ｍｍ３以下であり、かつ体積Ｖ２が０．０４４ｍｍ３以上０．０５９ｍｍ３以下である。【選択図】図５