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Response of the sensor S2 containing 0.09 wt% Pd (T = 261 °C) upon exposure to analyzed gas mixture of air with 1 20 ppm H2, 2 500 ppm H2, 3 500 ppm CH4, 4 500 ppm CO, 5 20 ppm H2 + 500 ppm CH4, 6 500 ppm H2 + 500 ppm CH4, 7 20 ppm H2 + 500 ppm CO, and 8 500 ppm H2 + 500 ppm CO
