G - Physics – 01 – N
Patent
G - Physics
01
N
324/25.5
G01N 27/62 (2006.01)
Patent
CA 1044324
ABSTRACT OF THE DISCLOSURE: This invention relates to a method for sensing and to a sensor for detecting the activity of gaseous anhydrides in an oxygen-bearing gas. There is provided a solid state electrolyte element having oxy-anions of the element forming the anhydride to be detected, this electrolyte element being constituted of two parts, one part being an alkali metal salt or an alkali-earth metal salt containing the oxy-anions and the other part being an oxygen ion-bearing electrolyte. A reference electrode is set in contact with the other part of the electrolyte element whereas a detection electrode, remote from the reference electrode, is in contact with the one part of the electrolyte element. The elec- trolyte element and detection electrode are arranged such that they are free to come into contact with the gaseous anhydride to be detected. The reference and detection electrodes are arranged such that a difference of potential occurs therebetween when a sample of the anhydride to be detected is contacted with the de- tection electrode and with the electrolyte element. Moreover, the electrolyte element is heated to a temperature such that a loga- rithmic variation in the concentration of the anhydride to be detected causes a proportional and substantially linear variation in the difference of potential, the temperature being below the fusion temperature of the electrolyte element. A potentiometric measurement device is connected to the electrodes for measuring the activity of the anhydride to be detected by measuring that difference of potential.
305135
Chamberland Andre M.
Gauthier Michel
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