Gas sensor installation structure, and method for installing gas sensor

摘要

A gas sensor 10 includes a sensor element 1 having a specific function, and a housing 5 containing the sensor element 1 therein and including a specific thread section 2 and a sealing surface 4 which forms a sealing section 3 together with an installation section at a position deeper than the thread section 2 in a direction in which the sensor element 1 is inserted. Release torque at 850 DEG C (1123 K) in the case where the housing is screwed into the installation section is 9 N.m or more, and an estimated value X1 of a gap formed between the sealing surface 4 and the installation section at 850 DEG C (1123 K) calculated according to a specific equation is 31 mu m or less.