Temperature compensated polarographic oxygen gas sensor and sens

Details Temperature compensated polarographic oxygen gas sensor and sens Temperature compensated polarographic oxygen gas sensor and sens

1981-03-11

1983-07-05

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204425, 204426, G01N 2756, G01N 2758

Patent

active

043916910

ABSTRACT:
To render output of a polarographic sensor essentially independent of aging of electrodes and temperature effects of the solid electrolyte body, within the operating ranges of the sensor to measure the oxygen composition of exhaust gases, the solid electrolyte plate of, for example, 50 mm length, 8 mm width and 1 mm thickness has a sensing electrode system including a cathode (2), and an anode (3) applied thereto, connected to a voltage source (7) of controllable output voltage. An oxygen molecule diffusion barrier (6) is applied to the cathode electrode. Additionally, a further electrode pair (5,4) is applied to the solid electrolyte body (1), serially connected in the current limiting circuit including the control voltage source. The voltage across one (2,3) of the electrode pairs is measured and compared with the voltage across the other electrode pair (4,5) voltage source, since the resistance of the zirconium solid electrolyte body drops with increasing temperature at roughly the same rate as the increase in limit current flow with increasing temperature. Both electrode pairs (2,3; 4,5) on the solid electrolyte body (1) are exposed to the gases, the oxygen content of which is to be analyzed.

REFERENCES:
patent: 3691023 (1972-09-01), Ruka et al.
patent: 3948081 (1976-04-01), Wessel et al.
patent: 3989614 (1976-11-01), Tien
patent: 4151503 (1979-04-01), Cermak et al.
patent: 4306957 (1981-12-01), Ishitani et al.

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