Heated 0.sub.2 sensor having isolated ground

Details Heated 0.sub.2 sensor having isolated ground Heated 0.sub.2 sensor having isolated ground

1987-04-13

1988-08-23

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204427, G01N 2726

Patent

active

047658819

ABSTRACT:
An oxygen sensor (24) having an electrolyte member (72) with a thimble that is held in a metal shell (30) by an insulating member (56). The thimble has an external surface (80) and internal surface (82) that are coated with a conductive material. A sleeve (96) is attached to the metal shell (30) by spot welds (108) and a seal is established therebetween. A terminal member (120) located in sleeve (96) includes a first contact ring (142) that is connected by a spring (148) and cylinder (152) to the external surface (80) and a second contact ring (144) that is connected by a coil spring (146) to the internal surface (82). Terminals (164 and 164')carried by terminal member (120) hold a tubular housing (90) of a heater member (92). Tubular housing (90) has an end (94) that is located in the thimble of electrolyte member (72). When electrical current is supplied to heater member (92) the temperature of the thimble is maintained above a minimum operating temperature of the electrolyte member (72). The external surface (80) of member (72) is subjected to exhaust gases while a reference gas is transmitted to internal surface (82). Changes in ion flow are carried by leads (106 and 106') to a controller (20) to provide an indication of the oxygen in the exhaust gases.

REFERENCES:
patent: 3844920 (1973-11-01), Burgett et al.
patent: 4019974 (1977-04-01), Weyl et al.
patent: 4111778 (1977-12-01), Davis et al.
patent: 4116797 (1978-09-01), Akatsuka
patent: 4155827 (1979-05-01), Maurer et al.
patent: 4556475 (1985-12-01), Bayha et al.
patent: 4560463 (1985-12-01), Frey et al.
patent: 4569748 (1986-02-01), Yamakawa et al.

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