| http://www.w3.org/ns/prov#value | - Table 3 shows that the oxygen sensor of this invention is almost free from a decrease in output current, which is caused by the clogging in atmosphere full of dust and soot such as a gas exhausted from a heavy oil-fed boiler as compared with a conventional oxygen sensor having pores or a porous ceramic, or that the oxygen sensor of this invention exhibits a stable output for a long period of time.
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