G - Physics – 01 – N
Patent
G - Physics
01
N
324/25.5
G01N 27/49 (2006.01)
Patent
CA 1216628
ABSTRACT OF THE DISCLOSURE An electrochemical gas detection cell, particularly suitable for detecting H2S, includes an electrochemical gas sensor which has a reference electrode, a sensing electrode and a counter electrode. The counter electrode is composed of carbon. The sensing electrode is composed of either gold or platinum and the reference electrode is composed of platinum. Circuitry is provided to supply voltage to the electrodes, the sensing electrode bias can be held below 300 mv., with respect to the reference electrode. The agent H2S can be readily detected when the bias is about 250 mv. The cell is associated with signal processing circuitry which produce audible and visual outputs. A nonaqueous electrolyte is provided. The electrolyte may be composed of either propylene carbonate or n-methyl-2-pyrrolidone and one of conductive compatible salts, such as tetrabutyl ammonium tetrafluoroborate.
464430
Campbell Donald N.
Clay Sandra B.
Schmidt John C.
Allied Corporation
Macrae & Co.
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