Method for determining aging of capacitive gas sensor, involves heating dielectric fluid of gas sensor with predetermined frequency in periodic manner, and determining aging of gas sensor on basis of change of gas signal

摘要

The method involves heating the dielectric fluid (120) of the gas sensor (100) with a predetermined frequency in a periodic manner, and determining the aging of the gas sensor on the basis of a change of the gas signal in response to the periodic heating. The frequency of heating is varied. The gas sensor is regarded as a low pass filter with respect to the periodic heating, where a parameter of the low pass filter is determined, and the aging is determined on the basis of the parameter. An independent claim is included for a capacitive gas sensor with a heating device.