System for determining a gas composition within a shut down...

Details System for determining a gas composition within a shut down... System for determining a gas composition within a shut down...

2006-12-12

2006-12-12

Sines, Brian J. (Department: 1743)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S010000, C429S006000, C429S050000, C429S061000, C429S064000, C422S083000, C422S098000, C073S001010, C073S001020, C073S023200

Reexamination Certificate

active

07147945

ABSTRACT:
The invention is a system (10) and method for determining a gas composition within a fuel cell (12) of a shut down fuel cell power plant. The system (10) includes at least one fuel cell (12), a sensor circuit (86) secured in electrical connection with the fuel cell (12), wherein the circuit (86) includes a power source (88), a voltage-measuring device (90), and a sensor circuit switch (92). The circuit (86) is secured so that the power source (88) may selectively deliver a pre-determined sensing current to the fuel cell (12) for a pre-determined sensing duration. The system (10) selectively admits the reducing fluid into an anode flow field (28) of the cell (12) whenever the sensor circuit (86) senses that a shut down monitoring voltage of the fuel cell (12) is the same as or exceeds a calibrated sensor voltage limit of the fuel cell (12).

REFERENCES:
patent: 5013617 (1991-05-01), Scheffler
patent: 5045414 (1991-09-01), Bushnell et al.
patent: 5170124 (1992-12-01), Blair et al.
patent: 5178969 (1993-01-01), Amemiya
patent: 5503944 (1996-04-01), Meyer et al.
patent: 6024848 (2000-02-01), Dufner et al.
patent: 6635370 (2003-10-01), Condit et al.
patent: 6835479 (2004-12-01), Balliet et al.
patent: 2005/0031917 (2005-02-01), Margiott et al.

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