Patent ID: 7121722

Claim:
A temperature sensor comprising: a flange having a bore and mounted on a fluid pipe having a fluid flow, to prevent said fluid from leaking out; a cable formed to have metallic cores retained inside a metallic outer cylinder and insulated from each other and the metallic outer cylinder, and fixed in such a mode in said bore that a leading end side of said cable protrudes from a leading end side of said flange and extends in an axial direction; a metallic cap fixed on a leading end side outer circumference of said cable and having fluid communication ports for allowing said fluid to flow therein; and a temperature sensing element including: a ceramic substrate housed in said cap; a sensing portion formed over said ceramic substrate and having electric characteristics varied with a temperature of said fluid; and a wiring portion for connecting said sensing portion and said metallic cores of said cable electrically; wherein said ceramic substrate is so housed in said cap that a rear end of said ceramic substrate is on a more rear side than a trailing end of said fluid communication ports formed in a side wall of said cap, and wherein a shielding portion for preventing said fluid from invading a region on a more rear side than a trailing end of said ceramic substrate is disposed in said cap between a trailing end of said fluid communication ports formed in said side wall of said cap and a leading end face of said outer cylinder of said cable.