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 (N 2 ), oxygen (O 2 ), carbon monoxide (CO), hydrogen (H 2 ) 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.