GAS SENSOR ELEMENT TREATMENT METHOD

摘要

A gas sensor element is heated at a temperature of 500° C. or higher for 15 minutes or more in a treatment atmosphere containing one or more gases selected from the gas group consisting of nitrogen (N2), oxygen (O2), carbon monoxide (CO), hydrogen (H2) and hydrocarbons (HC) and giving an air ratio of 0.80 to 1.10. In a gas sensor element to which such a treatment has been applied, a stable output is obtained without causing overshoot to an actual NOx concentration (input) even when a rapid exhaust gas change takes place.