G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/26 (2006.01) C21D 1/76 (2006.01) F02D 41/00 (2006.01) G01N 27/406 (2006.01) G01N 27/407 (2006.01)
Patent
CA 2060700
A system for use in sensing the oxygen content of an industrial furnace gas typically containing hydrocarbons or hydrogen is disclosed. The system utilizes a conventional automotive EGR oxygen sensor probe positioned in an espe- cially configured housing employing downstream flow regulat- ing means in combination with an orificing plate in the housing to provide uniform distribution of the endothermic gas at a low temperature about the sensor to insure accurate sensor readings with minimal carbon deposition. The elec- trical contacts at the oxygen sensor's inner and outer electrolyte surfaces are periodically switched to an elec- trical power supply to cause current to flow through and heat the electrolyte to elevated temperatures while air is flowed over the electrolyte's surfaces to achieve burn out of any carbon deposits and restore the life of the oxygen sensor probe. In addition, a portion of the sensor is ther- mally shielded to maintain somewhat equal reference air and furnace gas temperatures to produce consistent and reliable output signals from the oxygen sensor probe.
Barbee Garry W.
Huber Michael J.
Poor Ralph P.
Gowling Lafleur Henderson Llp
Surface Combustion Inc.
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