Method for detecting and measuring CH4 with GA2O3 sensor

摘要

A method for detecting CH4 with a Ga2O3 sensor, and a method for measuring CH4 concentration with a Ga2O3 sensor is provided. In order to solve the problem associated with the masking or disturbing effect alcohol has on the detection of methane with a gallium oxide detector, the present invention provides a method where the sensor conductivity ((G(t1)) is acquired at a first sensor temperature, and is compared with a first threshold value. If the conductivity ((G(t1)) exceeds this threshold value, it is determined that alcohol is present in the gas mixture to be examined. The sensor is then heated, and a second conductivity (G(t2)) is acquired. If the ratio of the second to the first conductivity exceeds a second threshold value, CH4 is likewise present in the gas mixture. The measurement of the CH4 concentration ensues by means of an acquisition of two conductivities (G(t1), G(t2)) at different temperatures. The corresponding CH4 value can be taken from a table or reference plot.