Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1992-07-10
1993-10-26
Dority, Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 78, 431 25, F23N 508
Patent
active
052560570
ABSTRACT:
A multi-stage, fail-safe fuel control circuit monitors a flame which emits photons and is supplied with fuel through a valve to a burner. The fuel control circuit includes a flame scanner adjacent the valve for generating a count signal including pulses provided at a rate proportional to the energy of the flame adjacent the burner. A timer provides at least one timing signal which periodically shifts between a first and second state. A capacitive pulse-height discriminator is coupled to the flame scanner and to the timer and measures the rate of the pulses in the count signal during the first state of the timing signal and generates a discriminator signal if the pulses exceed a desired rate during the first state. A capacitor discharge oscillator is coupled to the frequency discriminator and the timer charges a capacitor during the first state and provides an oscillating signal powered by the capacitor at a first frequency if the count discriminator signal is generated during the first state. A flame relay is coupled to the amplifier and controls the valve. The flame relay closes the valve if stage a) does not generate the count signal, if stage b) does not generate the timing signal, if stage c) does not generate the discriminator signal, if stage d) does not generate the oscillating signal, and if stage e) does not generate the maintaining voltage.
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Dority Carroll B.
Protection Controls Inc.
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