| 摘要 |
A partial pressure of oxygen sensor which finds utility when inserted into an exhaust system of a hydrocarbon fuel burning device. The oxygen sensor includes a mounting body both (a) threaded on one end for securement to the exhaust system, and (b) having a cylindrical configured bore extending along a central axis thereof. A heated sensing element of cylindrical configuration is also provided which includes a ceramic support, a resistance heater element wrapped around the ceramic support, and a titania dioxide sensor element closely located to the resistance heater element. The heated sensing element is mounted in the cylindrical configured bore of the mounting body in a manner that the titania dioxide sensor thereof projects beyond a threaded end of the mounting body. A protection device is provided over the titania dioxide sensor to protect the same and to permit exhaust gases to flow thereby. Electrical connections are made at the rear end of the mounting body to the resistance heater element and the titania dioxide sensor. Further structure is provided for supporting and sealing electrical lead wires and providing electrical connections in a manner that the heating element is connected to a source of voltage and the sensing element to a sensing circuit.
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