Flame quality monitor system for fixed firing rate oil burners
Patent 5126721 Issued on June 30, 1992. Estimated Expiration Date: 
October 23, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 23, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3537804 Method and apparatus for monitoring the burning efficiency of a furnace Data transmission system of optto-couplers Combustion monitor method for multi-burner boiler Patent #: 4756684 InventorsAssigneeApplicationNo. 601952 filed on 10/23/1990US Classes:340/578, By radiant energy250/554, Flame light source431/13WITH INDICATOR OR INSPECTION MEANSExaminersPrimary: Swann, III, Glen R.Attorney, Agent or FirmInternational ClassG08B 021/00AbstractA method and apparatus for determining and indicating the flame quality, or efficiency of the air-fuel ratio, in a fixed firing rate heating unit, such as an oil burning furnace, is provided. When the flame brightness falls outside a preset range, the flame quality, or excess air, has changed to the point that the unit should be serviced. The flame quality indicator output is in the form of lights mounted on the front of the unit. A green light indicates that the flame is about in the same condition as when the burner was last serviced. A red light indicates a flame which is either too rich or too lean, and that servicing of the burner is required. At the end of each firing cycle, the flame quality indicator goes into a hold mode which is in effect during the period that the burner remains off. A yellow or amber light indicates that the burner is in the hold mode. In this mode, the flame quality lights indicate the flame condition immediately before the burner turned off. Thus the unit can be viewed when it is off, and the flame condition at the end of the previous firing cycle can be observed.Other References
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