Dual detector flame sensor

Patent 4370557 Issued on January 25, 1983. Estimated Expiration Date:

August 27, 2000. 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.

Abstract Claims Description Full Text

Patent References

3689773

3716717

Flame detection system
Patent #: 3967255
Issued on: 06/29/1976
Inventor: Oliver , et al.

Flame monitoring system
Patent #: 4039844
Issued on: 08/02/1977
Inventor: MacDonald

Two channel optical flame detector Patent #: 4206454
Issued on: 06/03/1980
Inventor: Schapira , et al.

Inventors

Assignee

Honeywell Inc.

Application

No. 06/181580 filed on 08/27/1980

US Classes:

250/554, Flame light source250/339.15, Sensing flame or explosion340/578, By radiant energy431/79Photoelectric sensor

Examiners

Primary: Nelms, David C.

Attorney, Agent or Firm

Dahle; Omund R.

International Class

F23N 5/08 (20060101)

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.