Patent ID: 11899002
Assignee: NGK INSULATORS, LTD.
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 8:
9. The gas sensor according to claim 2, wherein
said concentration of NOx in said measurement gas is measured in a steady state of operation, said steady state of operation being a state in which said sensor element is maintained at said element driving temperature by being heated by said heater part, and oxygen partial pressure in said region that said first electrode faces in said at least one pump cell is maintained at or below a predetermined value,
said at least one pump cell performs preparatory pumping to pump out oxygen from said region while said heater part raises temperature of said sensor element to said element driving temperature, so that said gas sensor transitions from a non-steady state of operation to said steady state of operation, and
the controller determines whether said inter-electrode electric field exceeds said first threshold and determines whether said temperature index value exceeds said second threshold during transition from said non-steady state of operation to said steady state of operation.