Patent ID: 6497808
Filing Date: 2002-12-24
Classification: G01N

Abstract:
A gas sensor comprising:a sensor element including a solid electrolytic member, a measurement electrode, and a reference electrode, the measurement electrode being provided on the solid electrolytic member and being exposed to a measurement gas, the reference electrode being provided on the solid electrolytic member and being exposed to a reference gas; a ceramic heater for heating the sensor element, wherein a portion of the heater contacts a portion of the reference electrode of the sensor element; and means for enabling a temperature of the sensor element to be increased to 300Â° C. by the heater in ten seconds after a start of activation of the heater; wherein a leak resistance RL between the heater and the sensor element, and an internal resistance Ri of the sensor element have a relation as follows: Log(RL/Ri)&gE;2.