Gas sensor with electrically conductive, hydrophobic membranes

Details Gas sensor with electrically conductive, hydrophobic membranes Gas sensor with electrically conductive, hydrophobic membranes

2005-05-24

2005-05-24

Tung, T. (Department: 1743)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S424000, C204S426000, C205S783000, C205S784000

Reexamination Certificate

active

06896781

ABSTRACT:
A highly accurate, long life, low cost gas sensor is disclosed, particularly useful for measuring carbon monoxide and other toxic gases in an environment. The gas sensor has a first, sensing electrode and a second, counting electrode. Positioned between the first and second electrodes is an ion conducting, solid electrolyte membrane. In response to the presence of a toxic gas introduced to the first electrode, an electric signal is produced between the first electrode and the second electrode. The electric signal changes in response to changes in the concentration of the toxic gas. Detection circuitry measures the electric signal to determine the concentration of the toxic gas. An electrically conductive, hydrophobic top membrane electrically connects the first electrode to the detection circuitry while preventing liquid water from contacting the first electrode. An electrically conductive, hydrophobic bottom membrane electrically connects the second electrode to the detection circuitry. The top and bottom membranes, though hydrophobic, are preferably also microporous so as to be gas permeable, including permeable to water vapor. Preferably the top and bottom membranes are ion insulating as well. Optionally the sensor is provided with a water reservoir to maintain constant relative humidity at the ion conducting electrolyte membrane. The sensor may also have a heating element. Internal and external self-diagnostic features to ensure that the sensor is functioning normally are disclosed, as well as self-calibration features, so as to ensure sensor accuracy.

REFERENCES:
patent: 3400054 (1968-09-01), Ruka et al.
patent: 3410778 (1968-11-01), Krasberg
patent: 3493484 (1970-02-01), Berg et al.
patent: 3718566 (1973-02-01), Krebs
patent: 3755125 (1973-08-01), Shaw et al.
patent: 3928161 (1975-12-01), McIntyre et al.
patent: 4227984 (1980-10-01), Dempsey et al.
patent: 4384935 (1983-05-01), Stetter et al.
patent: 4526672 (1985-07-01), Reed
patent: 4664757 (1987-05-01), Zupancic et al.
patent: 4689132 (1987-08-01), Haigh
patent: 4697450 (1987-10-01), Bachman et al.
patent: 4718991 (1988-01-01), Yamazoe et al.
patent: 4820386 (1989-04-01), LaConti et al.
patent: 4860223 (1989-08-01), Grilk
patent: 4900422 (1990-02-01), Bryan et al.
patent: 4956063 (1990-09-01), Hale
patent: 5133857 (1992-07-01), Alberti et al.
patent: 5302274 (1994-04-01), Tomantschger et al.
patent: 5331310 (1994-07-01), Stetter et al.
patent: 5526280 (1996-06-01), Consadori et al.
patent: 5573648 (1996-11-01), Shen et al.
patent: 5650054 (1997-07-01), Shen et al.
patent: 5691704 (1997-11-01), Wong
patent: 5732691 (1998-03-01), Maiello et al.
patent: 5764150 (1998-07-01), Fleury et al.
patent: 5786768 (1998-07-01), Chan et al.
patent: 5789659 (1998-08-01), Williams
patent: 5798700 (1998-08-01), Wong
patent: 5804700 (1998-09-01), Kwon et al.
patent: 5980728 (1999-11-01), Farber et al.

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