Sensor for determining gas constituents and/or gas concentration

Details Sensor for determining gas constituents and/or gas concentration Sensor for determining gas constituents and/or gas concentration

1993-12-20

1995-10-24

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204421, 204424, 204426, 204429, 422 98, G01N 2741

Patent

active

054607116

ABSTRACT:
A sensor for determining at least one of gas constituents and gas concentrations in a gas mixture, such as CO, NO.sub.x and HC, in exhaust gas from an internal combustion engine, includes a semiconductor gas sensor having a gas sensitive region in communication with the gas mixture; a pumping cell including a solid electrolyte carrier and pumping electrodes disposed on the solid electrolyte carrier, the pumping cell being positioned in communication with the semiconductor gas sensor for effecting oxygen transfer to the semiconductor gas sensor on the side thereof opposite the gas mixture by pumping oxygen thereto to provide an O.sub.2 mole current density in the gas sensitive region, and the pumping cell having a pumping current; a cover layer which is gas tight and which has a restricted opening defined therein provided on the pumping cell on the side thereof which communicates with the semiconductor gas sensor so that the oxygen is pumped through the restricted opening to the semiconductor gas sensor, whereby the O.sub.2 mole current density in the gas sensitive region can be increased within the restricted opening while the pumping current remains constant, the gas sensitive region of the semiconductor gas sensor being disposed in the restricted opening so that an oxygen excess is established at the gas sensitive region due to the O.sub.2 mole current density.

REFERENCES:
patent: H427 (1988-02-01), Hirate et al.
patent: 4020830 (1977-05-01), Johnson et al.
patent: 4158166 (1979-06-01), Isenberg
patent: 4505807 (1985-02-01), Yamada
patent: 4578172 (1986-03-01), Yamada et al.
patent: 4728411 (1988-03-01), Mase et al.
patent: 4741817 (1988-05-01), Croset et al.
patent: 5169512 (1992-12-01), Wiedenmann et al.
patent: 5310472 (1994-05-01), Dietz et al.

Affiliated with

Also associated with

Rating

Sensor for determining gas constituents and/or gas concentration does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sensor for determining gas constituents and/or gas concentration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensor for determining gas constituents and/or gas concentration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1884312