Gas sensor having improved structure for minimizing thermal damage to hermetic seal

摘要

An improved structure of a gas sensor is provided which is designed to form an air-tight seal in a base end of a sensor body which is insensitive to heat. The gas sensor includes a seal assembly made up of an elastic seal and a heat-resistant support. The heat-resistant support is located closer to the top of the gas sensor than the elastic seal to protect the elastic seal from the heat transmitted to the base end from the top of the sensor body. The elastic seal is disposed within the base end of the sensor body and compressed constantly to produce a reactive force which serves to create the air-tight seal in the base end of the gas sensor through which lead wires pass.