Patent ID: 6740218
Filing Date: 2004-05-25
Classification: F02D,G01N

Abstract:
A gas sensor comprising:a gas sensing element including a cup-shaped cylindrical solid electrolytic element having a reference gas chamber defined therein, a measured gas sensing electrode provided on an outer surface of said solid electrolytic element, and a reference gas sensing electrode provided on an inner surface of said solid electrolytic element facing said reference gas chamber, and a heater accommodated in said reference gas chamber, wherein a contact portion is provided on an outer cylindrical surface of said heater so that said contact portion is brought into contact with an inside surface of said reference gas chamber, a heat generating peak position of said heater being in the vicinity of said contact portion, said heater having a heat generating section for generating heat in response to electric power supplied thereto, and said heat generating section has a high resistive portion provided at a proximal end side thereof.