Oxygen sensing cell

Details Oxygen sensing cell Oxygen sensing cell

1982-08-26

1984-03-06

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204415, G01N 2750

Patent

active

044352689

ABSTRACT:
An improved oxygen sensing cell, especially of the polarographic type, is intended for use primarily in a gaseous environment. The cell has a cathode located at the bottom of the cell body. The cathode comprises a gold mesh electrode laminated to a thin-film sense membrane. The electrode is thus made immobile relative to the membrane, thereby improving the response time and providing for long-term sensor stability. The cell further has a guard electrode for the cathode. The guard electrode operates continuously and scavenges any oxygen molecules which are dissolved in the electrolyte and diffused towards the cathode. As a result, the dynamic range of the cell is substantially increased. The anode comprises a silver wire wound about a spool retained within the main cavity in the cell body. A p.c. board, as well as a compensation membrane, are resiliently retained at the top of the cell body. The body carries conductors for electrically connecting the p.c. board with the anode, cathode, and guard electrode, respectively.

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