Burner flame detection
Patent 4280184 Issued on July 21, 1981. Estimated Expiration Date: 
June 26, 1999. 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.
June 26, 1999. 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 3196273 3283154 3416041 3651327 Flame monitoring apparatus Logic circuitry Flame detection system Flame responsive system Flame detector Patent #: 4157506 InventorsAssigneeApplicationNo. 06/052113 filed on 06/26/1979US Classes:340/578, By radiant energy250/554, Flame light source307/653Flame responsive (e.g., flame acts as a rectifier in circuit)ExaminersPrimary: Ruggiero, JosephAttorney, Agent or FirmInternational ClassesF23N 5/24 (20060101)F23N 5/08 (20060101) AbstractMethod and apparatus for evaluating the quality of a flame in response to outputs from a flame sensor.The present invention includes a method and apparatus in which output pulses from a flame sensor are continuously counted.The number of pulses is accumulated over a time interval of a predetermined length and compared with a threshold value. The accumulated total is continuously updated to reflect the pulses received over the previous time interval to effectively provide a moving time-window of a fixed length over which pulses from the flame sensor are accumulated. Other additional checks may be made to ascertain that a flame is present, including the time over which no pulses are detected and a long-term average of the number of pulses.A preferred embodiment disclosed in which numerous self-checking features are incorporated, and which includes a novel bar-graph type of display for displaying flame quality and diagnostic information. | |
