| abstract |
The invention concerns a detector for anhydrides, present in the air or stack gases, which comprises a solid state electrolyte element containing oxy-anions of the particular anhydride to be detected. This solid state element is provided with metal areas to which potentiometric measuring means are connected. The detecting element is, preferably, sintered and may consist of one or several juxtaposed solid state compounds, according as the reference source is a gas or a solid state electrode, respectively. The electrolyte element is heated to a temperature not exceeding its fusion point. In addition, particular arrangements are provided to compensate for the oxygen content variations in air due to varying measurement conditions. |