| 摘要 |
<p>The apparatus which measures the concentration of two or more gases such as oxygen and nitric oxide in a gas mixture has at least two compartments 7 and 22 in which the most easily reduced gas is reduced in the first compartment 7 and the next easily reduced gas is reduced in the second compartment 22 and so on until all the gases of interest have been reduced. The reduction is carried out by applying a voltage from sources 9, 19 between electrodes 6, 7 and 17, 18 located on opposite sides of solid electrolyte 4. A voltage of 100 - 200 mV is used for oxygen, 250 - 300 mV for nitric oxide and 800 mV for SO2. The current, as measured by ammeters 8 and 24, required to electrochemically reduce each gaseous component being measured in the gas mixture is directly proportional to the concentration of that gas in the mixture. Gas partial pressures in the cavities 7, 22 can be monitored and the reductions controlled by solid electrolyte gauge sensors 10, 3, 11 and 20, 3, 21. <IMAGE></p> |
