Gas monitor using electrochemical cell and method of operating

Details Gas monitor using electrochemical cell and method of operating Gas monitor using electrochemical cell and method of operating

2007-05-29

2007-05-29

Nguyen, Tai (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S633000, C600S500000, C600S538000, C600S549000, C600S558000, C128S204180, C128S205110, C128S205240

Reexamination Certificate

active

11029145

ABSTRACT:
A method and apparatus for gas detection uses a sensor such as an electrochemical (EC) cell and includes a feedback control loop to control a pump to establish a first predetermined gas flow rate to the EC cell. The concentration of the gas at the first predetermined flow rate is measured. If the detected concentration exceeds a predetermined Alert value at the first flow rate an Initial Warning without remedial action is generated, and, the system then changes the gas flow rate before an Alarm is indicated. An Alarm is signaled only if the system verifies the first measurement. Preferably the first flow rate is set to optimize the measurement accuracy of the EC cell being used, and the second flow rate is lower than the first. Verification of an Alarm at the first flow rate may be conducted quickly by a quick-reaction process. The controller may periodically cycle the flow rates between the first and second rates for better accuracy and faster verification times.

REFERENCES:
patent: 5722449 (1998-03-01), Heinonen et al.
patent: 6076523 (2000-06-01), Jones et al.
patent: 2002/0178783 (2002-12-01), Miller et al.
International Search Report, ISA/US, Examiner Tai T. Nguyen, Search Completed Jul. 26, 2006, Mailed Sep. 5, 2006, including Written Opinion, 7 pages.

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