Dual detector flame sensor

Details Dual detector flame sensor Dual detector flame sensor

1980-08-27

1983-01-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

431 79, 340578, H05B 3300

Patent

active

043705570

ABSTRACT:
In a multi-burner boiler or industrial furnace installation that uses pulverized coal for fuel and utilizes an oil pilot torch it has been difficult to sense and discriminate satisfactorily between safe and unsafe burner operation in these multi-burner arrangements. By using both a Si detector (visible light responsive) and a lead sulfide detector (infrared responsive) and selectively combining the signals therefrom, the best characteristics of both detectors are utilized to provide satisfactory flame sensing.

REFERENCES:
patent: 3689773 (1972-09-01), Wheeler
patent: 3716717 (1973-02-01), Scheidweiler
patent: 3967255 (1976-06-01), Oliver et al.
patent: 4039844 (1977-08-01), MacDonald
patent: 4206454 (1980-06-01), Schapira et al.

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