Gas sensor
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United States of America Patent
Stats
-
Dec 31, 2002
Grant Date -
Jun 21, 2001
app pub date -
Dec 13, 2000
filing date -
Dec 16, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A central electrode 12 is arranged in a coiled heater electrode 10. They are buried in a SnO.sub.2 -based inner area 6, and the entirety is covered by a filter 8. The volume of the inner area 6 is set at from 1.times.10.sup.-3 mm.sup.3 to 16.times.10.sup.-3 mm.sup.3, the total volume of the bead 4 is set at from 15.times.10.sup.-3 mm.sup.3 to 70.times.10.sup.-3 mm.sup.3, and the ratio of the total volume of the bead 4 to the volume of the inner area 6 is set at from four to twenty to bring the sensor resistance in CO and that in methane closer to each other and increase the selectivity from hydrogen.
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