| 摘要 |
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 Uhmes and Ummes are measured. When the ratio Ummes/Uhmes exceeds the value of gas separation coefficient E, known in advance, the methane concentration is determined from the formula Cmmes = Ummes/Km. When the ratio Ummes/Uhmes is less or equal to the E coefficient, the hydrogen concentration is determined from the formula Chmes = Uhmes/Kh. ^ EFFECT: reduced power consumption and enhanced accuracy of measuring. ^ 1 dwg |
