US PATENT SUBCLASS 204 / 427
.~.~.~.~.~ With gas reference material

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

193  DF  APPARATUS {5}
194  DF  .~ Electrolytic {11}
400  DF  .~.~ Analysis and testing {20}
421  DF  .~.~.~ Solid electrolyte {2}
424  DF  .~.~.~.~ Gas sample sensor {3}
427.~.~.~.~.~ With gas reference material {1}
428  DF  .~.~.~.~.~.~> With protective element {1}

DEFINITION

Classification: 204/427

With gas reference material:

(under subclass 424) Apparatus having a solid electrolyte with electrode films attached to the sides which are in turn in contact with a gas sample and a reference gas.

(1) Note. Oxygen sensor for control of air/fuel ratio in internal combustion engines are included herein.

(2) Note. The reference gas is usually provided by an opening to admit atmospheric air.

SEE OR SEARCH THIS CLASS, SUBCLASS:

424, for gas sensors in which the reference material is a solid material which produces the particle pressure as a reference standard.