Development of Gas Sensors for Detecting SF₅ Decompotsition Products and Locating Faults in GIS

Potentiometric Solid State Ionic Sensor

Abstract

Gas sensors for detecting SF₅ decomposition products are being actively pursued as low cost instrumentation for detecting and locating faults in GIS. We developed a potentiometric solid state ionic sensor using high ionic conductive solid. The sensor responded to the changes in HF concentration ranging from 1 to 1000wt.ppm in SF₆ gas at 1atm. The electromotive force of the sensor increased linearly with an increase in the logarithm of P_HF following Nernst equation. The slope of the line suggested that the number of charge transfer of the electrode reaction is unity.