Patent ID: 6673224
Filing Date: 2004-01-06
Classification: C03C,G01N

Abstract:
A gas sensor comprising:a hollow housing having a first and a second end portion; a sensor element having a length which includes a first and a second portion; a hollow insulating member disposed in said housing, retaining said sensor element therein; a first cover installed on the first end portion of said housing to define a first chamber in which the first portion of said sensor element is exposed to a reference gas; a second cover installed on the second end portion of said housing to define a second chamber in which the second portion of said sensor element is exposed to a gas to be measured; and a glass sealing member disposed between an inner wall of said hollow insulating member and an outer wall of said sensor element to establish a hermetical seal between the first and second chamber, wherein differences in thermal expansion between said glass sealing member and said sensor element and between said glass sealing member and said hollow insulating member are within a range of Â±1Ã—10âˆ’6/Â° C.