Patent ID: 9709425
Date: 2017-07-18
CPC Classifications: F01N,G01D,G01L,G01N

Claim:
1. A sensor comprising: a sensor element which is exposed to a target atmosphere and detects a predetermined characteristic of the target atmosphere; a circuit board having an element attachment surface on which the sensor element is mounted, a wiring trace being formed on the element attachment surface; a casing member that houses the circuit board therein, the casing member having a measurement chamber which faces the sensor element and communicates with the target atmosphere through a gas inlet formed in the casing member; and an annular elastic seal member which is interposed between the element attachment surface and the casing member in such a manner that the elastic seal member is in contact with the element attachment surface, wherein the elastic seal member is made of foamed rubber; the elastic seal member has an end surface portion which faces the casing member and another end surface portion which faces the element attachment surface, the end surface portion having at least a flat portion, and the other end surface portion having at least another flat portion; and the elastic seal member is interposed between the element attachment surface and the casing member in a state in which the elastic seal member is compressed at the flat portion and the other flat portion.