Measuring and testing – Gas analysis – By thermal property
Patent
1997-05-09
1999-03-30
Noori, Max H.
Measuring and testing
Gas analysis
By thermal property
73 3105, G01N 2500
Patent
active
058891986
ABSTRACT:
A method for detecting CH.sub.4 with a Ga.sub.2 O.sub.3 sensor, and a method for measuring CH.sub.4 concentration with a Ga.sub.2 O.sub.3 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(t.sub.1)) is acquired at a first sensor temperature, and is compared with a first threshold value. If the conductivity ((G(t.sub.1)) 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(t.sub.2)) is acquired. If the ratio of the second to the first conductivity exceeds a second threshold value, CH.sub.4 is likewise present in the gas mixture. The measurement of the CH.sub.4 concentration ensues by means of an acquisition of two conductivities (G(t.sub.1), G(t.sub.2)) at different temperatures. The corresponding CH.sub.4 value can be taken from a table or reference plot.
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Fleischer Maximilian
Meixner Hans
Reitmeier Norbert
Noori Max H.
Siemens Aktiengesellschaft
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