METHOD OF MEASURING CONCENTRATION OF METHANE AND/OR HYDROGEN Russian patent published in 2005 - IPC

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises measuring signal at the catalytically active sensor of a gas analyzer connected in the measuring bridge circuit and determining the concentration of methane and/or hydrogen from the value of the output voltage. In the calibration regime, when source voltage provides heating of the sensor up to the temperature of thermocatalytic reaction of methane oxidation, the sensors are affected alternatively by testing hydrogen-air and methane-air gas mixtures, and the calibration coefficients are calculated for hydrogen and methane. In the measuring regime, the sensor is heated by voltage Uh up to the temperature of thermocatalytic oxidation of hydrogen, and Um voltage is then supplied. Before removing the voltages, the Uh_mes and Um_mes are measured. When the ratio Um_mes/Uh_mes exceeds the value of gas separation coefficient E, known in advance, the methane concentration is determined from the formula Cm_mes = Um_mes/Km. When the ratio Um_mes/Uh_mes is less or equal to the E coefficient, the hydrogen concentration is determined from the formula Ch_mes = Uh_mes/Kh.

EFFECT: reduced power consumption and enhanced accuracy of measuring.

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