Polarographic sensor and sensing system for determining oxygen c

Details Polarographic sensor and sensing system for determining oxygen c Polarographic sensor and sensing system for determining oxygen c

1984-04-27

1985-01-29

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204425, G01N 2758

Patent

active

044964552

ABSTRACT:
The linearity of response of a polarographic sensor, of the diffusion-limited current type, having a solid electrolyte (1) and being particularly adapted for measuring oxygen content in exhaust gases from combustion processes, is improved by providing the anode (2b) of the sensor's first, measuring cell with a constant, internal supply of reference oxygen. Preventing the oxygen concentration at the anode (2b) from fluctuating eliminates a non-linearity which would otherwise occur in the plot of oxygen concentration versus diffusion-limited current, as the fuel/air ratio of the mixture being combusted passes 1.
The oxygen supply takes the form of a second, pumping cell (3a,3b) which can utilize the same solid electrolyte layer (1) as the first cell, and which pumps oxygen ions across the electrolyte to the second cell's anode (3b), where they become oxygen molecules and are directed through a duct (8) to the measuring cell's anode (2b).
Excessive pressure in the duct (8) is prevented by providing small pores (10) in the surrounding glass cover (9) for outward diffusion of excess oxygen. A constant voltage is applied to both cells.

REFERENCES:
patent: 4356065 (1982-10-01), Dietz
patent: 4391691 (1983-07-01), Linder et al.

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