全固态SO_x(x=2,3)气体传感器性能评价

THE PERFORMANCE EVALUATION OF A FULLY SOLID STATE SO_x(x=2,3)GAS SENSOR

SO_z(x=2,3)是许多金属冶炼过程及工业用炉排放的有毒气体之一。监控和测定气体中的SO_x浓度,对环境保护、防止大气污染和对某些生产工艺控制具有现实意义。已有的SO_x检测法是吸收待测气体后再用化学法、色谱法或电化学法分析。这些方法不适宜在高温环境下直接测定,只能间歇操作,难以用于生产过程的连续控制。固体电解质电化学电池型SO_x气敏元件,具有灵敏度高,选择性好,响应快,操作简便,体积小且连续可控的特点。

The galvanic cell type SO_x(x=2,3) gas sensors consisting of with Ag-β'-alumina as solid electrolyte and porous Pt as working electrode and Ag as reference electrode have been constructed and tested. The electric motion force(EMF) responses were in good agreement with theoretical values for the SO_x(x=2,3) partial pressures over a range from 10 ppm to 10~4 ppm at the temperature 550～750℃. And CO,CO_2 and NO_2 having the concentrations more than 10 times of SO_x didn't disturb the measurement.