Sensor device detecting specific component in gas

A sensor device comprising:

• a sensor element provided with a detection section for detecting a specific component in a gas that is under measurement;
• a housing having the sensor element inserted into an interior thereof such that the detection section is positioned at the tip end of the sensor element with respect to an axial direction;
• and
• an element cover disposed at the tip end of the housing,
• wherein
• the element cover comprising an inner cover disposed to cover the tip end of the sensor element and an outer cover disposed with a space between it and an outer periphery of the inner cover;
• the inner cover has a side and a tip face having inner side holes and an inner tip face hole respectively provided therein, through which the gas under measurement flows;
• the outer cover is provided with outer side holes in a side, through which the gas under measurement flow, and the tip position of the outer side holes is closer to the tip end than is the tip position of the inner cover;
• a flow path that is provided between the outer surface of the inner cover and the inner surface of the outer cover has a large clearance section, having a maximum clearance amount, at the outside of the tip end of the inner cover, and a small clearance section, having a minimum clearance amount, that is closer to the base end than is the large clearance section, with the flow path having a shape whereby the large clearance section and the small clearance section are connected without a step, at a position that is closer to the tip end than is the tip of the sensor element, and, designating he clearance amount of the large clearance section in a direction at right angles to the axial direction as d1 and designating the clearance amount of the small clearance section in a direction a right angles to the axial direction as d2, the clearance ration d1/d2 is greater than 2.45;
• and
• wherein the base position of the outer side holes in the outer cover is identical to the tip position of the inner cover or is closer to the tip end than is the tip position of the inner cover, and wherein the tip face of the outer cover has no gas flow hole that is positioned facing the inner tip face hole with respect to the axial direction.