Patent ID: 6214186
Filing Date: 2001-04-10
Classification: G01N

Abstract:
A gas concentration sensor comprising:a gas concentration measuring element having a gas-exposed portion to be exposed to a gas to be measured;a hollow cylindrical holder holding therein said gas concentration measuring element, said holder having an end surface on which an inner and an outer extension are formed;a groove formed in the end surface of said holder, said groove being defined by side walls of the outer and inner extensions, a bottom formed between the side walls of the outer and inner extensions, and a tapered wall extending from the bottom to the side wall of the inner extension; anda protective cover covering the gas-exposed portion of said gas concentration measuring element, said protective cover having a flange which is retained within the groove of said holder by crimping the outer extension inward to install said protective cover on the end surface of said holder, said flange making elastic engagement at at least three portions thereof with the side wall of the outer extension, the bottom, and the tapered wall of the groove.