| Title of Invention | METHOD AND APPARATUS FOR CIRCUIT FAULT DETECTION WITH BOILER WATER LEVEL DETECTION SYSTEM |
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| Abstract | A fault detection circuit in a boiler−water level system includes a dual−frequency signal generator which develops two AC components with no associated DC component. The two frequencies are mixed and sent through an impedance matching circuit to match the impedance of the signal generating portion of the system with the impedance of the boiler water under measurement. The impedance−matched signal is then directed to two legs, one leg directed through one of a plurality of electrode probes and then to a first filter circuit, and the other leg is directed a second set of filters. In combination, the filters pass either the higher or the lower of the two frequencies to determine an open or short condition in the level sensing circuitry, as well as a steam vs. water condition. |
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1812-chenp-2004 correspondence others.pdf
1812-chenp-2004 correspondence po.pdf
1812-chenp-2004 description (complete).pdf
1812-CHENP-2004 POWER OF ATTORNEY.pdf
| Patent Number | 212627 | ||||||||
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| Indian Patent Application Number | 1812/CHENP/2004 | ||||||||
| PG Journal Number | 07/2008 | ||||||||
| Publication Date | 15-Feb-2008 | ||||||||
| Grant Date | 05-Dec-2007 | ||||||||
| Date of Filing | 13-Aug-2004 | ||||||||
| Name of Patentee | TYCO FLOW CONTROL, INC | ||||||||
| Applicant Address | 273 CORPORATE DRIVE, SUITE 100, PORTSMOUTH, NEW HAMPSHIRE 03801 | ||||||||
Inventors:
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| PCT International Classification Number | G01F 23/24 | ||||||||
| PCT International Application Number | PCT/US2003/000867 | ||||||||
| PCT International Filing date | 2003-01-10 | ||||||||
PCT Conventions:
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