Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1988-10-24
1989-11-07
Green, Randall L.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
250339, 340578, F23N 508
Patent
active
048788317
ABSTRACT:
In an infrared flame detector system an infrared photodetector is positioned to receive infrared radiation from the flame to be detected. The output of the infrared flame detector is amplified with a gain readily switchable between two different gain values. The amplified output signal is filtered by a programmable high pass filter, in which the corner frequency can be selected to have different values and is readily switchable between two different values to correspond with different fuels generating the flame being detected. The output of the programmable filter is full wave rectified to provide a DC signal level corresponding to the AC signal generated across the photodetector. This DC signal level is compared with a reference signal voltage selected to correspond with the signal voltage produced when no flame is present, to provide an indication of the presence or absence of a flame.
REFERENCES:
patent: 3026927 (1962-03-01), Matheis et al.
patent: 3902841 (1975-09-01), Horn
patent: 4477245 (1984-10-01), Giachino et al.
Forney International, Inc.
Green Randall L.
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